Flora of North America species comparison

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Psilocarphus brevissimus

Psilocarphus oregonus

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

Oregon woolly marbles, Oregon woolly-heads, Oregon woollyheads or woolly marbles, woolly marbles
Habit Plants greenish to grayish, sericeous to densely lanuginose. Plants silvery to whitish, densely sericeous to somewhat lanuginose.
Stems

(1–)2–10, erect to prostrate;

proximal internode lengths mostly 0.5–1.5(–2) times leaf lengths.

(1–)2–10, ascending to ± prostrate;

proximal internode lengths mostly 0.5–1.5(–2) times leaf lengths.
Receptacles

unlobed or ± lobed.

unlobed.
Heads

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

± spheric, largest 4–6 mm.
Cypselae

narrowly obovoid, ± compressed, 0.8–1.9 mm.

narrowly ± cylindric, terete, 0.6–1.2 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.

leaves ± erect, appressed to heads, linear to narrowly oblanceolate, widest in distal 2/3, longest 12–20 mm, lengths mostly 6–12 times widths, (3–)3.5–5 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).

paleae individually visible through indument, longest mostly 1.5–2.7 mm.
Staminate

corollas 0.8–1.6 mm, lobes mostly 5.

corollas 0.7–1.4 mm, lobes mostly 4.
2n

= 28.

Psilocarphus brevissimus

Psilocarphus oregonus
Phenology Flowering and fruiting late Mar–mid Aug.
Habitat Seasonally inundated or flooded clay soils (vernal pool margins, drainages, moist rocky slopes)
Elevation 10–1800(–2400) m (0–5900(–7900) ft)
Distribution
from FNA
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC; SK; s South America
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; ID; NV; OR; WA
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

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

Psilocarphus oregonus occurs from west-central California through most of Oregon to southeastern Washington, western Idaho, and northern Nevada. Relatively narrow-leaved, montane forms of P. tenellus account for reports of P. oregonus from the southern Sierra Nevada to Baja California; further study may show these to be intermediates between the two taxa.

A malformed plant collected in Merced County, California, appears to have been a sterile hybrid between P. oregonus and Hesperevax caulescens (J. D. Morefield 1992c).

(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. FNA vol. 19, p. 459.
Parent taxa Asteraceae > tribe Gnaphalieae > Psilocarphus Asteraceae > tribe Gnaphalieae > Psilocarphus
Sibling taxa
P. chilensis, P. elatior, P. oregonus, P. tenellus
P. brevissimus, P. chilensis, P. elatior, P. tenellus
Subordinate taxa
P. brevissimus var. brevissimus, P. brevissimus var. multiflorus
Name authority Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 340. (1840) Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 341. (1840)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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