Psilocarphus oregonus |
Psilocarphus tenellus |
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Oregon woolly marbles, Oregon woolly-heads, Oregon woollyheads or woolly marbles, woolly marbles |
slender woolly-heads, slender woolly-marbles |
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Habit | Plants silvery to whitish, densely sericeous to somewhat lanuginose. | Plants greenish to grayish, arachnoid to ± sericeous. |
Stems | (1–)2–10, ascending to ± prostrate; proximal internode lengths mostly 0.5–1.5(–2) times leaf lengths. |
(1–)2–10, ascending to ± prostrate; proximal internode lengths mostly 1–2(–3) times leaf lengths. |
Receptacles | unlobed. |
unlobed. |
Heads | ± spheric, largest 4–6 mm. |
± spheric, largest 3–5.5 mm. |
Cypselae | narrowly ± cylindric, terete, 0.6–1.2 mm. |
narrowly obovoid, somewhat compressed, 0.7–1.2 mm. |
Capitular | 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. |
leaves ± spreading, mostly not appressed to heads, spatulate to obovate, widest in distal 1/3, longest 6–15 mm, lengths mostly 2–5 times widths, 1.5–2.5(–3) times head heights. |
Pistillate | paleae individually visible through indument, longest mostly 1.5–2.7 mm. |
paleae individually visible through indument, longest mostly 1.5–2.7 mm. |
Staminate | corollas 0.7–1.4 mm, lobes mostly 4. |
corollas 0.8–1.5 mm, lobes mostly 5. |
Psilocarphus oregonus |
Psilocarphus tenellus |
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Phenology | Flowering and fruiting late Mar–mid Aug. | Flowering and fruiting late Mar–early Aug. |
Habitat | Seasonally inundated or flooded clay soils (vernal pool margins, drainages, moist rocky slopes) | Dry or seasonally moist, barren to wooded slopes, flats, often disturbed sites (foot paths, road beds, burns), sometimes near vernal pools toward s |
Elevation | 10–1800(–2400) m (0–5900(–7900) ft) | 0–2100 m (0–6900 ft) |
Distribution |
CA; ID; NV; OR; WA
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CA; ID; OR; WA; BC; Mexico (Baja California)
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Discussion | 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.) |
Psilocarphus tenellus is relatively common in the Californian Floristic Province from northwestern Baja California to southwestern Oregon; northward it is scattered to northern Idaho and Vancouver Island, British Columbia. It has been of conservation concern in Canada (J. M. Illingworth and G. W. Douglas 1994b). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 19, p. 459. | FNA vol. 19, p. 459. |
Parent taxa | Asteraceae > tribe Gnaphalieae > Psilocarphus | Asteraceae > tribe Gnaphalieae > Psilocarphus |
Sibling taxa | ||
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 341. (1840) | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 341. (1840) |
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