Categories
The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
(first | last) View (previous 3,000 | next 3,000) (20 | 50 | 100 | 250 | 500)- Polygalaceae (12 members)
- Polygaloides (1 member)
- Polygonaceae (4 members)
- Polygonaceae subfam. Eriogonoideae (38 members)
- Polygonaceae subfam. Polygonoideae (32 members)
- Polygonatum (3 members)
- Polygonella (12 members)
- Polygonella polygama (3 members)
- Polygonum (6 members)
- Polygonum aviculare (6 members)
- Polygonum fowleri (2 members)
- Polygonum humifusum (1 member)
- Polygonum oxyspermum (2 members)
- Polygonum polygaloides (4 members)
- Polygonum ramosissimum (2 members)
- Polygonum sawatchense (2 members)
- Polygonum sect. Duravia (22 members)
- Polygonum sect. Polygonum (16 members)
- Polymnia (3 members)
- Polypodiaceae (14 members)
- Polypodiophyta (20 members)
- Polypodium (11 members)
- Polypogon (8 members)
- Polypremum (1 member)
- Polystachya (1 member)
- Polystichum (16 members)
- Polystichum imbricans (2 members)
- Polytrias (1 member)
- Polytrichaceae (18 members)
- Polytrichastrum (11 members)
- Polytrichastrum alpinum (4 members)
- Polytrichastrum formosum (2 members)
- Polytrichastrum sexangulare (2 members)
- Polytrichum (8 members)
- Polytrichum commune (2 members)
- Pontederia (1 member)
- Pontederiaceae (8 members)
- Ponthieva (2 members)
- Populus (10 members)
- Populus deltoides (3 members)
- Populus fremontii (2 members)
- Porophyllum (6 members)
- Porophyllum ruderale (1 member)
- Porotrichum (1 member)
- Portulaca (11 members)
- Portulaca umbraticola (2 members)
- Portulacaceae (18 members)
- Position (711 members)
- Position relational (53 members)
- Potamogeton (35 members)
- Potamogeton foliosus (2 members)
- Potamogeton pusillus (3 members)
- Potamogetonaceae (4 members)
- Potentilla (43 members)
- Potentilla anserina (4 members)
- Potentilla arenosa (2 members)
- Potentilla concinna (3 members)
- Potentilla crebridens (1 member)
- Potentilla effusa (2 members)
- Potentilla glaucophylla (2 members)
- Potentilla gracilis (5 members)
- Potentilla hyparctica (2 members)
- Potentilla ovina (2 members)
- Potentilla rhyolitica (2 members)
- Potentilla sect. Arenicolae (1 member)
- Potentilla sect. Aureae (11 members)
- Potentilla sect. Biflorae (1 member)
- Potentilla sect. Brevifoliae (1 member)
- Potentilla sect. Chrysanthae (3 members)
- Potentilla sect. Concinnae (9 members)
- Potentilla sect. Graciles (9 members)
- Potentilla sect. Leucophyllae (5 members)
- Potentilla sect. Lupinoides (1 member)
- Potentilla sect. Multijugae (11 members)
- Potentilla sect. Niveae (13 members)
- Potentilla sect. Pensylvanicae (8 members)
- Potentilla sect. Pentaphylloides (2 members)
- Potentilla sect. Potentilla (5 members)
- Potentilla sect. Rectae (1 member)
- Potentilla sect. Rivales (5 members)
- Potentilla sect. Rubrae (3 members)
- Potentilla sect. Rubricaules (8 members)
- Potentilla sect. Subjugae (2 members)
- Potentilla sect. Subviscosae (9 members)
- Potentilla sect. Terminales (3 members)
- Potentilla subviscosa (2 members)
- Potentilla supina (1 member)
- Potentilla thurberi (2 members)
- Poteridium (2 members)
- Poterium (2 members)
- Poterium sanguisorba (1 member)
- Pottiaceae (10 members)
- Pottiaceae subfam. Barbuloideae (32 members)
- Pottiaceae subfam. Merceyoideae (2 members)
- Pottiaceae subfam. Pottioideae (30 members)
- Pottiaceae subfam. Timmielloideae (2 members)
- Pottiaceae subfam. Trichostomoideae (14 members)
- Pouteria (1 member)
- Pouzolzia (1 member)
- Prenanthella (1 member)
- Prenanthes (14 members)
- Prescottia (1 member)
- Primula (22 members)
- Primula cuneifolia (2 members)
- Primula cusickiana (4 members)
- Primulaceae (10 members)
- Prosartes (5 members)
- Proserpinaca (2 members)
- Prosthechea (5 members)
- Prosthechea boothiana (1 member)
- Prosthechea cochleata (1 member)
- Proteaceae (2 members)
- Prunus (49 members)
- Prunus fasciculata (2 members)
- Prunus ilicifolia (2 members)
- Prunus pumila (4 members)
- Prunus serotina (3 members)
- Prunus virginiana (2 members)
- Psacalium (1 member)
- Psathyrostachys (1 member)
- Psathyrotes (3 members)
- Psathyrotopsis (1 member)
- Pseudabutilon (2 members)
- Pseudelephantopus (1 member)
- Pseudephemerum (1 member)
- Pseudobahia (3 members)
- Pseudobraunia (1 member)
- Pseudobryum (1 member)
- Pseudocalliergon (4 members)
- Pseudocampylium (1 member)
- Pseudoclappia (2 members)
- Pseudocrossidium (4 members)
- Pseudocryphaea (1 member)
- Pseudocydonia (1 member)
- Pseudoditrichaceae (2 members)
- Pseudoditrichum (1 member)
- Pseudognaphalium (21 members)
- Pseudogynoxys (1 member)
- Pseudoleskea (10 members)
- Pseudoleskea incurvata (3 members)
- Pseudoleskea radicosa (3 members)
- Pseudoleskeella (4 members)
- Pseudolycopodiella (1 member)
- Pseudophoenix (2 members)
- Pseudophoenix sargentii (1 member)
- Pseudorchis (2 members)
- Pseudorchis albida (1 member)
- Pseudoroegneria (1 member)
- Pseudorontium (1 member)
- Pseudosasa (1 member)
- Pseudoscleropodium (1 member)
- Pseudostellaria (3 members)
- Pseudotaxiphyllum (3 members)
- Pseudotsuga (3 members)
- Pseudotsuga menziesii (2 members)
- Psidium (2 members)
- Psilactis (5 members)
- Psilocarphus (6 members)
- Psilocarphus brevissimus (2 members)
- Psilopilum (2 members)
- Psilostrophe (6 members)
- Psilotaceae (2 members)
- Psilotophyta (1 member)
- Psilotum (1 member)
- Pteridaceae (26 members)
- Pteridium (2 members)
- Pteridium aquilinum (4 members)
- Pteridophytes (4 members)
- Pterigynandraceae (8 members)
- Pterigynandrum (1 member)
- Pteris (6 members)
- Pteris cretica (2 members)
- Pterobryaceae (6 members)
- Pterocaulon (2 members)
- Pteroglossaspis (1 member)
- Pterospora (1 member)
- Pterostegia (1 member)
- Pterygoneurum (5 members)
- Pterygoneurum subsessile (2 members)
- Ptilagrostis (2 members)
- Ptilium (1 member)
- Ptychomitriaceae (4 members)
- Ptychomitrium (5 members)
- Ptychosperma (2 members)
- Ptychostomum (4 members)
- Ptychostomum subg. Cladodium (16 members)
- Ptychostomum subg. Ptychostomum (15 members)
- Puccinellia (21 members)
- Pulicaria (1 member)
- Punica (1 member)
- Purshia (5 members)
- Purshia tridentata (2 members)
- Putranjivaceae (2 members)
- Pylaisia (4 members)
- Pylaisiadelpha (1 member)
- Pyracantha (6 members)
- Pyramidula (1 member)
- Pyrola (8 members)
- Pyrola asarifolia (2 members)
- Pyrrhobryum (1 member)
- Pyrrhopappus (4 members)
- Pyrrocoma (21 members)
- Pyrrocoma carthamoides (3 members)
- Pyrrocoma clementis (2 members)
- Pyrrocoma crocea (2 members)
- Pyrrocoma hirta (3 members)
- Pyrrocoma lanceolata (2 members)
- Pyrrocoma racemosa (5 members)
- Pyrrocoma uniflora (2 members)
- Pyrularia (1 member)
- Pyrus (6 members)
- Pyxidanthera (2 members)
- Quadrella (2 members)
- Quantity (653 members)
- Quercus (6 members)
- Quercus durata (2 members)
- Quercus garryana (3 members)
- Quercus sect. Lobatae (35 members)
- Quercus sect. Protobalanus (4 members)
- Quercus sect. Quercus (54 members)
- Quercus sinuata (2 members)
- Racomitrium (1 member)
- Racopilaceae (2 members)
- Racopilum (1 member)
- Radiola (1 member)
- Rafinesquia (2 members)
- Raillardella (3 members)
- Rainiera (1 member)
- Ranunculaceae (44 members)
- Ranunculus (18 members)
- Ranunculus acriformis (3 members)
- Ranunculus alismifolius (6 members)
- Ranunculus aquatilis (2 members)
- Ranunculus arizonicus (1 member)
- Ranunculus bonariensis (1 member)
- Ranunculus californicus (2 members)
- Ranunculus canus (2 members)
- Ranunculus eschscholtzii (5 members)
- Ranunculus flammula (3 members)
- Ranunculus glaberrimus (2 members)
- Ranunculus glacialis (2 members)
- Ranunculus harveyi (1 member)
- Ranunculus hispidus (3 members)
- Ranunculus inamoenus (2 members)
- Ranunculus occidentalis (7 members)
- Ranunculus orthorhynchus (3 members)
- Ranunculus pedatifidus (1 member)
- Ranunculus recurvatus (1 member)
- Ranunculus sceleratus (2 members)
- Ranunculus sect. Arcteranthis (1 member)
- Ranunculus sect. Cyrtorhyncha (1 member)
- Ranunculus sect. Echinella (8 members)
- Ranunculus sect. Epirotes (28 members)
- Ranunculus sect. Flammula (13 members)
- Ranunculus sect. Halodes (1 member)
- Ranunculus sect. Hecatonia (5 members)
- Ranunculus sect. Pseudaphanostemma (1 member)
- Ranunculus sect. Ranunculus (26 members)
- Ranunculus subg. Batrachium (4 members)
- Ranunculus subg. Ceratocephala (1 member)
- Ranunculus subg. Coptidium (1 member)
- Ranunculus subg. Crymodes (3 members)
- Ranunculus subg. Cyrtorhyncha (8 members)
- Ranunculus subg. Ficaria (1 member)
- Ranunculus subg. Oxygraphis (1 member)
- Ranunculus subg. Pallasiantha (1 member)
- Ranunculus subg. Ranunculus (10 members)
- Raphanus (2 members)
- Rapistrum (1 member)
- Ratibida (5 members)
- Ratibida peduncularis (2 members)
- Rauiella (2 members)
- Rayjacksonia (3 members)
- Redfieldia (1 member)
- Reference (6,778 members)
- Reimarochloa (1 member)
- Remirea (1 member)
- Reseda (4 members)
- Resedaceae (4 members)
- Revised Since Print (1,287 members)
- Reynosia (1 member)
- Rhabdoweisia (2 members)
- Rhachitheciaceae (2 members)
- Rhachithecium (1 member)
- Rhagadiolus (1 member)
- Rhamnaceae (30 members)
- Rhamnus (16 members)
- Rhamnus davurica (1 member)
- Rhamnus utilis (1 member)
- Rhapidophyllum (1 member)
- Rheum (1 member)
- Rhexia (14 members)
- Rhexia mariana (2 members)
- Rhexophyllum (1 member)
- Rhinanthus (3 members)
- Rhinanthus minor (2 members)
- Rhinotropis (16 members)
- Rhinotropis cornuta (2 members)
- Rhinotropis lindheimeri (2 members)
- Rhinotropis nitida (2 members)
- Rhinotropis rimulicola (2 members)
- Rhizogoniaceae (2 members)
- Rhizomnium (8 members)
- Rhizophora (1 member)
- Rhizophoraceae (2 members)
- Rhodiola (4 members)
- Rhodiola integrifolia (3 members)
- Rhodobryum (2 members)
- Rhododendron (26 members)
- Rhododendron minus (2 members)
- Rhodomyrtus (2 members)
- Rhodomyrtus tomentosa (1 member)
- Rhodotypos (1 member)
- Rhynchosida (1 member)
- Rhynchospora (70 members)
- Rhynchospora globularis (3 members)
- Rhynchospora harveyi (2 members)
- Rhynchostegium (2 members)
- Rhytidiaceae (2 members)
- Rhytidiadelphus (5 members)
- Rhytidiopsis (1 member)
- Rhytidium (1 member)
- Ribes (61 members)
- Ribes aureum (3 members)
- Ribes californicum (2 members)
- Ribes cereum (2 members)
- Ribes divaricatum (3 members)
- Ribes inerme (2 members)
- Ribes oxyacanthoides (5 members)
- Ribes roezlii (3 members)
- Ribes sanguineum (2 members)
- Ricinus (1 member)
- Rigiopappus (1 member)
- Rivina (1 member)
- Roellobryaceae (2 members)
- Roellobryon (1 member)
- Roemeria (1 member)
- Roldana (1 member)
- Romneya (2 members)
- Romulea (1 member)
- Rorippa (23 members)
- Rorippa palustris (2 members)
- Rosa (5 members)
- Rosa acicularis (2 members)
- Rosa carolina (2 members)
- Rosa gymnocarpa (2 members)
- Rosa nutkana (3 members)
- Rosa pisocarpa (2 members)
- Rosa rubiginosa (2 members)
- Rosa sect. Bracteatae (1 member)
- Rosa sect. Caninae (6 members)
- Rosa sect. Gallicae (1 member)
- Rosa sect. Laevigatae (1 member)
- Rosa sect. Minutifoliae (3 members)
- Rosa sect. Pimpinellifoliae (1 member)
- Rosa sect. Rosa (25 members)
- Rosa sect. Systylae (3 members)
- Rosa stellata (3 members)
- Rosa subg. Hesperhodos (2 members)
- Rosa subg. Rosa (13 members)
- Rosa woodsii (6 members)
- Rosaceae (6 members)
- Rosaceae subfam. Amygdaloideae (16 members)
- Rosaceae subfam. Dryadoideae (2 members)
- Rosaceae subfam. Rosoideae (12 members)
- Rosaceae tribe Agrimonieae (10 members)
- Rosaceae tribe Amygdaleae (2 members)
- Rosaceae tribe Colurieae (8 members)
- Rosaceae tribe Dryadeae (8 members)
- Rosaceae tribe Exochordeae (4 members)
- Rosaceae tribe Gillenieae (38 members)
- Rosaceae tribe Kerrieae (8 members)
- Rosaceae tribe Lyonothamneae (2 members)
- Rosaceae tribe Neillieae (4 members)
- Rosaceae tribe Potentilleae (28 members)
- Rosaceae tribe Roseae (2 members)
- Rosaceae tribe Rubeae (2 members)
- Rosaceae tribe Sorbarieae (6 members)
- Rosaceae tribe Spiraeeae (12 members)
- Rosaceae tribe Ulmarieae (2 members)
- Rostraria (1 member)
- Rosulabryum (13 members)
- Rotala (3 members)
- Rottboellia (1 member)
- Roystonea (1 member)
- Rubus (40 members)
- Rubus arcticus (3 members)
- Rubus idaeus (2 members)
- Rubus leucodermis (2 members)
- Rudbeckia (6 members)
- Rudbeckia fulgida (7 members)
- Rudbeckia grandiflora (2 members)
- Rudbeckia hirta (4 members)
- Rudbeckia laciniata (5 members)
- Rudbeckia sect. Dracopis (1 member)
- Rudbeckia sect. Macrocline (14 members)
- Rudbeckia sect. Rudbeckia (13 members)
- Rudbeckia triloba (3 members)
- Rugelia (1 member)
- Rugosa (1 member)
- Rumex (8 members)
- Rumex sect. Axillares (21 members)
- Rumex sect. Rumex (32 members)
- Rumex subg. Acetosa (5 members)
- Rumex subg. Acetosella (4 members)
- Rumex subg. Platypodium (1 member)
- Rumex subg. Rumex (4 members)
- Ruppia (2 members)
- Ruppiaceae (2 members)
- Russelia (1 member)
- Rutenbergiaceae (2 members)
- Rytidosperma (3 members)
- Sabal (5 members)
- Saccharum (10 members)
- Saccharum brevibarbe (2 members)
- Sacciolepis (2 members)
- Sachsia (1 member)
- Sacoila (3 members)
- Sacoila lanceolata (2 members)
- Saelania (1 member)
- Sageretia (3 members)
- Sagina (13 members)
- Sagina decumbens (2 members)
- Sagina maxima (2 members)
- Sagina nodosa (2 members)
- Sagittaria (28 members)
- Sagittaria graminea (3 members)
- Sagittaria guayanensis (1 member)
- Sagittaria lancifolia (2 members)
- Sagittaria montevidensis (3 members)
- Sairocarpus (11 members)
- Sairocarpus cornutus (2 members)
- Sairocarpus vexillocalyculatus (3 members)
- Salicaceae (8 members)
- Salicornia (4 members)
- Salix (10 members)
- Salix alaxensis (2 members)
- Salix brachycarpa (2 members)
- Salix calcicola (2 members)
- Salix exigua (2 members)
- Salix glauca (4 members)
- Salix humilis (2 members)
- Salix lasiandra (2 members)
- Salix ovalifolia (4 members)
- Salix rotundifolia (2 members)
- Salix sect. Arbuscella (1 member)
- Salix sect. Argyrocarpae (1 member)
- Salix sect. Canae (1 member)
- Salix sect. Candidae (1 member)
- Salix sect. Chamaetia (3 members)
- Salix sect. Cinerella (10 members)
- Salix sect. Cordatae (7 members)
- Salix sect. Daphnella (1 member)
- Salix sect. Diplodictyae (4 members)
- Salix sect. Floridanae (1 member)
- Salix sect. Fulvae (1 member)
- Salix sect. Geyerianae (3 members)
- Salix sect. Glaucae (5 members)
- Salix sect. Griseae (1 member)
- Salix sect. Hastatae (18 members)
- Salix sect. Helix (1 member)
- Salix sect. Herbella (5 members)
- Salix sect. Humboldtianae (7 members)
- Salix sect. Lanatae (4 members)
- Salix sect. Maccallianae (1 member)
- Salix sect. Mexicanae (3 members)
- Salix sect. Myrtilloides (4 members)
- Salix sect. Myrtosalix (5 members)
- Salix sect. Nigricantes (1 member)
- Salix sect. Ovalifoliae (4 members)
- Salix sect. Phylicifoliae (5 members)
- Salix sect. Salicaster (5 members)
- Salix sect. Salix (4 members)
- Salix sect. Setchellianae (1 member)
- Salix sect. Sitchenses (4 members)
- Salix sect. Subalbae (3 members)
- Salix sect. Triandrae (1 member)
- Salix sect. Villosae (4 members)
- Salix sect. Viminella (1 member)
- Salix subg. Chamaetia (16 members)
- Salix subg. Longifoliae (8 members)
- Salix subg. Protitea (4 members)
- Salix subg. Salix (10 members)
- Salix subg. Vetrix (38 members)
- Salix wolfii (2 members)
- Salsola (7 members)
- Salsola kali (2 members)
- Salvinia (1 member)
- Salviniaceae (2 members)
- Samolus (3 members)
- Sandbergia (2 members)
- Sanguinaria (1 member)
- Sanguisorba (4 members)
- Sanionia (4 members)
- Sansevieria (1 member)
- Santalaceae (4 members)
- Santalum (1 member)
- Santolina (1 member)
- Sanvitalia (3 members)
- Saponaria (2 members)
- Sapotaceae (10 members)
- Sarcobatus (2 members)
- Sarcocornia (3 members)
- Sarcodes (1 member)
- Sarmentypnum (5 members)
- Sarracenia (14 members)
- Sarracenia alabamensis (2 members)
- Sarracenia purpurea (2 members)
- Sarracenia rubra (2 members)
- Sarraceniaceae (4 members)
- Sartwellia (1 member)
- Sassafras (1 member)
- Saururaceae (4 members)
- Saururus (1 member)
- Saussurea (8 members)
- Saussurea amara (1 member)
- Saussurea angustifolia (3 members)
- Saxifraga (29 members)
- Saxifraga bronchialis (2 members)
- Saxifraga flagellaris (3 members)
- Saxifraga oppositifolia (2 members)
- Saxifraga rivularis (2 members)
- Saxifragaceae (46 members)
- Saxifragopsis (1 member)
- Scabrethia (2 members)
- Scabrethia scabra (3 members)
- Schaefferia (2 members)
- Schedonnardus (1 member)
- Schedonorus (3 members)
- Scheuchzeria (1 member)
- Scheuchzeriaceae (2 members)
- Schiedeella (1 member)
- Schisandra (1 member)
- Schisandraceae (2 members)
- Schismus (2 members)
- Schistidium (30 members)
- Schistophragma (1 member)
- Schistostega (1 member)
- Schistostegaceae (2 members)
- Schizachne (1 member)
- Schizachyrium (11 members)
- Schizachyrium sanguineum (2 members)
- Schizachyrium scoparium (3 members)
- Schizaea (1 member)
- Schizaeaceae (4 members)
- Schkuhria (2 members)
- Schlotheimia (2 members)
- Schoenobryum (1 member)
- Schoenocaulon (3 members)
- Schoenolirion (3 members)
- Schoenoplectus (8 members)
- Schoenoplectus acutus (2 members)
- Schoenoplectus erectus (1 member)
- Schoenoplectus purshianus (2 members)
- Schoenoplectus sect. Actaeogeton (5 members)
- Schoenoplectus sect. Malacogeton (3 members)
- Schoenoplectus sect. Schoenoplectus (9 members)
- Schoenoplectus sect. Supini (4 members)
- Schoenoplectus smithii (3 members)
- Schoenus (1 member)
- Schoepfia (1 member)
- Schoepfiaceae (2 members)
- Schwalbea (1 member)
- Schwetschkeopsis (1 member)
- Scilla (1 member)
- Scirpus (18 members)
- Sciuro-hypnum (11 members)
- Scleranthus (4 members)
- Scleranthus annuus (1 member)
- Scleranthus perennis (1 member)
- Scleria (16 members)
- Scleria ciliata (3 members)
- Scleria pauciflora (2 members)
- Sclerocactus (15 members)
- Sclerocarpus (1 member)
- Sclerochloa (1 member)
- Sclerolepis (1 member)
- Sclerolinon (1 member)
- Scleropodium (7 members)
- Scleropodium touretii (2 members)
- Scleropogon (1 member)
- Scoliopus (2 members)
- Scolochloa (1 member)
- Scolymus (2 members)
- Scoparia (2 members)
- Scopelophila (2 members)
- Scopulophila (1 member)
- Scorpidium (3 members)
- Scorzonera (2 members)
- Scouleria (2 members)
- Scouleriaceae (2 members)
- Scribneria (1 member)
- Scrophularia (11 members)
- Scrophulariaceae (18 members)
- Secale (2 members)
- Sedella (3 members)
- Sedum (49 members)
- Sedum lanceolatum (2 members)
- Sedum laxum (5 members)
- Sedum obtusatum (4 members)
- Sedum oreganum (2 members)
- Sedum radiatum (3 members)
- Sedum spathulifolium (2 members)
- Sedum stenopetalum (2 members)
- Sedum wrightii (2 members)
- Selaginella (6 members)
- Selaginella arenicola (2 members)
- Selaginella mutica (2 members)
- Selaginella subg. Selaginella (1 member)
- Selaginella subg. Stachygynandrum (11 members)
- Selaginella subg. Tetragonostachys (29 members)
- Selaginellaceae (2 members)
- Selenia (4 members)
- Selenicereus (3 members)
- Seligeria (13 members)
- Seligeriaceae (6 members)
- Sematophyllaceae (18 members)
- Sematophyllum (4 members)
- Sempervivum (1 member)
- Senecio (63 members)
- Senecio amplectens (2 members)
- Senecio bigelovii (2 members)
- Senecio eremophilus (3 members)
- Senecio flaccidus (3 members)
- Senecio fremontii (4 members)
- Senecio integerrimus (5 members)
- Senecio multidentatus (1 member)
- Senecio serra (2 members)
- Sequoia (1 member)
- Sequoiadendron (1 member)
- Serenoa (1 member)
- Sericocarpus (6 members)
- Sericocarpus oregonensis (2 members)
- Sesamum (1 member)
- Sesleria (4 members)
- Sesuvium (4 members)
- Setaria (8 members)
- Setaria pumila (2 members)
- Setaria reverchonii (3 members)
- Setaria subg. Paurochaetium (1 member)
- Setaria subg. Ptychophyllum (3 members)
- Setaria subg. Reverchoniae (2 members)
- Setaria subg. Setaria (24 members)
- Setaria viridis (2 members)
- Setariopsis (1 member)
- Seymeria (7 members)
- Seymeria falcata (1 member)
- Seymeria pectinata (2 members)
- Shape (126 members)
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- Sida (20 members)
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- Sidalcea (36 members)
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- Sidalcea hickmanii (7 members)
- Sidalcea malviflora (7 members)
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- Sidastrum (1 member)
- Sideroxylon (13 members)
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- Size (1,454 members)
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- Soleirolia (1 member)
- Solidago (4 members)
- Solidago (sect. Solidago) ser. Argutae (9 members)
- Solidago (sect. Solidago) ser. Auriculatae (1 member)
- Solidago (sect. Solidago) ser. Brachychaeta (1 member)
- Solidago (sect. Solidago) ser. Drummondiani (1 member)
- Solidago (sect. Solidago) ser. Odorae (2 members)
- Solidago (sect. Solidago) ser. Venosae (7 members)
- Solidago altissima (2 members)
- Solidago arguta (4 members)
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- Solidago rugosa (6 members)
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- Solidago sect. Ptarmicoidei (7 members)
- Solidago sect. Solidago (22 members)
- Solidago sempervirens (2 members)
- Solidago simplex (9 members)
- Solidago speciosa (4 members)
- Solidago stricta (2 members)
- Solidago subsect. Argutae (6 members)
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- Solidago subsect. Nemorales (7 members)
- Solidago subsect. Squarrosae (11 members)
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- Solidago subsect. Triplinerviae (14 members)
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- Solidago ulmifolia (2 members)
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- Soliva (3 members)
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- Some measurement (129 members)
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- Sophronanthe (2 members)
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- Sorbus (6 members)
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- Sorbus sitchensis (2 members)
- Sorbus subg. Aria (1 member)
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- Spergularia media (1 member)
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- Sphaeralcea (33 members)
- Sphaeralcea ambigua (3 members)
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- Sphaeromeria (9 members)
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- Sphagnum (18 members)
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- Sphagnum majus (2 members)
- Sphagnum sect. Acutifolia (26 members)
- Sphagnum sect. Cuspidata (30 members)
- Sphagnum sect. Insulosa (1 member)
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- Sphagnum sect. Sphagnum (12 members)
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- Structure (14 members)
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- Texture (501 members)
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- Xylococcus (1 member)
- Xylorhiza (10 members)
- Xylorhiza tortifolia (2 members)
- Xylosma (1 member)
- Xyridaceae (2 members)
- Xyris (24 members)
- Xyris difformis (3 members)
- Xyris laxifolia (1 member)
- Xyris stricta (2 members)
- Yermo (1 member)
- Youngia (1 member)
- Yucca (32 members)
- Yucca angustissima (4 members)
- Yucca baccata (2 members)
- Yucca elata (2 members)
- Yucca gloriosa (2 members)
- Zaluzania (1 member)
- Zamia (1 member)
- Zamiaceae (2 members)
- Zannichellia (1 member)
- Zannichelliaceae (2 members)
- Zea (5 members)
- Zea mays (4 members)
- Zelometeorium (1 member)
- Zenobia (1 member)
- Zephyranthes (16 members)
- Zeuxine (1 member)
- Zigadenus (15 members)
- Zigadenus venenosus (2 members)
- Zingiber (1 member)
- Zingiberaceae (8 members)
- Zinnia (5 members)
- Zizania (6 members)
- Zizania aquatica (2 members)
- Zizania palustris (2 members)
- Zizaniopsis (1 member)
- Ziziphus (6 members)
- Zostera (2 members)
- Zosteraceae (4 members)
- Zoysia (3 members)
- Zuckia (2 members)
- Zuckia brandegeei (3 members)
- Zygodon (6 members)
- Zygodon viridissimus (3 members)
- Zygophyllaceae (12 members)
- Zygophyllum (1 member)
- ×achnella (1 member)
- ×agropogon (1 member)
- ×arctodupontia (1 member)
- ×dupoa (1 member)
- ×elyhordeum (10 members)
- ×elyleymus (11 members)
- ×leydeum (3 members)
- ×pascoleymus (1 member)
- ×pseudelymus (1 member)
- ×pucciphippsia (1 member)