Isocoma tenuisecta

Greene

Leafl. Bot. Observ. Crit.1: 169. 1906

Common names: Shrine jimmyweed burroweed
Synonyms: Haplopappus tenuisectus
Found in FNA Volume 20. Treatment on page 445. Mentioned on page 440.
FNA20 P47 Isocoma acradenia.jpeg
Herbage minutely hispidulous to hirtellous or sparsely puberulous (at least distal stems), not resinous. Leaf blades oblong-oblanceolate, 20–35 mm, margins pinnatifid (lobes spreading at right angles, linear to filiform). Involucres 4–6.5 × 2–2.8 mm. Phyllary apices with small, sharply delimited, green resinous area, not aristate, often distinctly thickened and approaching resin pockets, usually gland-dotted. Florets 8–12(–15); corollas 4.5–6 mm. Cypsela ribs not forming hornlike extensions.

Phenology: Flowering Sep–Nov.
Habitat: Sandy or gravelly flats and hills, grasslands, usually matorral or Larrea stands
Elevation: 700–1600 m

Distribution

Ariz., N.Mex., Mexico (Sonora).

Discussion

Some plants approach Isocoma acradenia var. acradenia in leaf and phyllary morphology in southern Arizona, where the ranges of the two taxa overlap.

References

None.

Facts about "Isocoma tenuisecta"
AuthorGuy L. Nesom +
Common nameShrine jimmyweed + and burroweed +
Elevation700–1600 m +
HabitatSandy or gravelly flats and hills, grasslands, usually matorral or Larrea stands +
IllustratorBarbara Alongi +
PhenologyFlowering Sep–Nov. +
ReferenceNone +
SynonymHaplopappus tenuisectus +
Taxon nameIsocoma tenuisecta +
Taxon parentIsocoma +
Taxon rankspecies +
VolumeVolume 20 +