Psilocarphus brevissimus

Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 340. 1840.

Common names: Short woollyheads
Treatment appears in FNA Volume 19. Treatment on page 458. Mentioned on page 457.

Plants greenish to grayish, sericeous to densely lanuginose. Stems (1–)2–10, erect to prostrate; proximal internode lengths mostly 0.5–1.5(–2) times leaf lengths. Capitular leaves ± erect, appressed to heads (sometimes spreading), linear-lanceolate to ovate, widest in proximal 2/3, longest 8–25 mm, lengths mostly 1.5–6 times widths, 1–2.5(–3) times head heights. Heads ± spheric, rarely ovoid, largest 6–14 mm. Receptacles unlobed or ± lobed. Pistillate paleae hidden by or visible through indument, longest 2.8–4 mm (lengths 1.5–6 times longest diams.; wings subapical to ± median). Staminate corollas 0.8–1.6 mm, lobes mostly 5. Cypselae narrowly obovoid, ± compressed, 0.8–1.9 mm. 2n = 28.

Distribution

V19-759-distribution-map.gif

Alta., B.C., Sask., Calif., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo., s South America.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Heads ± spheric, largest 6–9 mm, receptacles unlobed or shallowly lobed; pistillate paleae obovoid, lengths 1.5–3 times longest diams., wings supramedian to subapical Psilocarphus brevissimus var. brevissimus
1 Heads ovoid, largest 9–14 mm, receptacles deeply lobed; pistillate paleae ± cylindric, lengths mostly 3.5–6 times longest diams., wings ± median Psilocarphus brevissimus var. multiflorus