Psilocarphus oregonus |
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Oregon woolly marbles, Oregon woolly-heads, Oregon woollyheads or woolly marbles, woolly marbles |
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Habit | Plants silvery to whitish, densely sericeous to somewhat lanuginose. |
Stems | (1–)2–10, ascending to ± prostrate; proximal internode lengths mostly 0.5–1.5(–2) times leaf lengths. |
Receptacles | unlobed. |
Heads | ± spheric, largest 4–6 mm. |
Cypselae | narrowly ± cylindric, terete, 0.6–1.2 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. |
Pistillate | paleae individually visible through indument, longest mostly 1.5–2.7 mm. |
Staminate | corollas 0.7–1.4 mm, lobes mostly 4. |
Psilocarphus oregonus |
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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 |
CA; ID; NV; OR; WA
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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.) |
Source | FNA vol. 19, p. 459. |
Parent taxa | Asteraceae > tribe Gnaphalieae > Psilocarphus |
Sibling taxa | |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 341. (1840) |
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