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- 170. 1971. Wilfred B. Schofield† Etymology: For Roelof van der Wijk, 1895 – 1981, Dutch bryologist Treatment appears in FNA Volume 28. Treatment on page 5822 KB (186 words) - 22:39, 5 November 2020
- hesperium (Maxon & R. T. Clausen) W. H. Wagner & Lellinger Amer. Fern J. 71: 92. 1981. Warren H. Wagner Jr., Florence S. Wagner Common names: Western moonwort3 KB (259 words) - 21:24, 5 November 2020
- Botrychium speciesBotrychium crenulatum W. H. Wagner Amer. Fern J. 71: 21. 1981. Warren H. Wagner Jr., Florence S. Wagner Common names: Dainty moonwort Endemic3 KB (239 words) - 21:25, 5 November 2020
- with 11 new combinations in Minuartia. Rhodora 82: 495–502. Wofford, B. E. 1981. External seed morphology of Arenaria (Caryophyllaceae) of the southeastern6 KB (634 words) - 23:15, 5 November 2020
- bolanderi var. harfordii (A. Gray) W. A. Weber & Á. Löve Phytologia 49: 45. 1981. Debra K. Trock Endemic Basionym: Senecio bolanderi A. Gray Proc. Amer. Acad4 KB (296 words) - 19:32, 6 November 2020
- neomexicana var. toumeyi (A. Gray) W. A. Weber & Á. Löve Phytologia 49: 47. 1981. Debra K. Trock Basionym: Senecio neomexicanus A. Gray in A. Gray et al.4 KB (301 words) - 19:32, 6 November 2020
- pseudaurea var. semicordata (Rydberg) W. A. Weber & Á. Löve Phytologia 49: 48. 1981. Debra K. Trock Common names: False-gold groundsel Endemic Basionym: Senecio4 KB (279 words) - 19:29, 6 November 2020
- var. lewisrosei (Torrey & A. Gray) W. A. Weber & Á. Löve Phytologia 49: 46. 1981. Debra K. Trock Endemic Basionym: Senecio eurycephalus Torrey & A. Gray Mem3 KB (255 words) - 19:22, 6 November 2020
- to warrant the inclusion of the genus in the Juncaginaceae (A. Cronquist 1981). Molecular evidence also corroborates the close relationship between Lilaea4 KB (389 words) - 21:32, 5 November 2020
- here in Heterotheca and all species treated here in Pityopsis (J. C. Semple 1981, 1996, literature cited therein). The two annual species of Bradburia are10 KB (763 words) - 21:03, 5 November 2020
- pollination syndrome (D. C. Michener 1981, 1982). Leaf morphology is typical of drought-deciduous plants (Michener 1981). Varieties are recognized in part9 KB (928 words) - 23:29, 14 January 2021
- appears to be relatively isolated among epaleate Heliantheae (H. Robinson 1981). B. G. Baldwin et al. (2002) included Lycapsus Philippi in Peritylinae.4 KB (315 words) - 21:14, 5 November 2020
- Eleocharis torticulmis T. V. Egorova Novosti Sist. Vyssh. Rast. 18: 101. 1981. S. Galen Smith*, Jeremy J. Bruhl*, M. Socorro González-Elizondo*, Francis7 KB (699 words) - 21:38, 5 November 2020
- varietyCampylopus atrovirens var. cucullatifolius J.-P. Frahm Bryologist 83: 574, fig. 1. 1981,. Jan-Peter Frahm Treatment appears in FNA Volume 27. Treatment on page 3692 KB (129 words) - 22:26, 5 November 2020
- Eremogone hookeri var. pinetorum (Nuttall) W. A. Weber Brittonia 33: 326. 1981. Ronald L. Hartman, Richard K. Rabeler, Frederick H. Utech Common names:3 KB (293 words) - 18:07, 6 November 2020
- genusCypripedium speciesCypripedium kentuckiense C. F. Reed Phytologia 48: 426, fig. 1981. Charles J. Sheviak Common names: Ivory lady’s-slipper purloined slipper5 KB (493 words) - 22:11, 5 November 2020
- Arct. URSS 10: 117. 1987. Luc Brouillet Etymology: For Eric Hultén, 1894–1981, Swedish botanist, specialist of the circumpolar flora Basionym: Dendranthema3 KB (290 words) - 20:57, 5 November 2020
- Physaria lepidota subsp. membranacea Rollins Brittonia 33: 335, figs. 1, 2. 1981. Steve L. O’Kane Jr. Common names: Kane County twinpod Endemic Treatment4 KB (310 words) - 18:14, 6 November 2020
- adaptation to different pollinators in different parts of its range (R. B. Miller 1981). Four weakly differentiated varieties are recognized. Aquilegia coerulea4 KB (346 words) - 18:00, 6 November 2020
- The relationships of the family are not a matter of dispute (A. Cronquist 1981; R. C. Carolin 1987); the same cannot be said for the relationships and delimitations9 KB (722 words) - 23:01, 5 November 2020