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dwarf woolly-heads, dwarf woolly-marbles, Robbin's pondweed, short woollyheads, woolly marbles

Habit 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.

Receptacles

unlobed or ± lobed.

Heads

± spheric, rarely ovoid, largest 6–14 mm.

Cypselae

narrowly obovoid, ± compressed, 0.8–1.9 mm.

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.

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.

2n

= 28.

Psilocarphus brevissimus

Distribution
from FNA
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC; SK; s South America
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[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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
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
var. multiflorus
Source FNA vol. 19, p. 458.
Parent taxa Asteraceae > tribe Gnaphalieae > Psilocarphus
Sibling taxa
P. chilensis, P. elatior, P. oregonus, P. tenellus
Subordinate taxa
P. brevissimus var. brevissimus, P. brevissimus var. multiflorus
Name authority Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 340. (1840)
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