Pseudognaphalium thermale |
Pseudognaphalium luteoalbum |
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northwestern rabbit-tobacco, slender cudweed, slender false cudweed, small head cudweed, Wright's cudweed |
Jersey cudweed, Jersey rabbit tobacco, red-tip rabbit-tobacco, weedy cudweed |
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Habit | Perennials, (20–)30–70 cm; taprooted. | Annuals, 15–40 cm; taprooted or fibrous-rooted. |
Stems | loosely tomentose, not glandular. |
loosely white-tomentose, not glandular. |
Leaf | blades narrowly oblanceolate, 3–8 cm × 3–6 mm (gradually smaller distally, becoming linear), bases not clasping, decurrent 5–14 mm, margins flat, faces concolor, loosely tomentose, sessile-glandular beneath tomentum. |
blades (crowded, internodes 1–5, sometimes to 10 mm) narrowly obovate to subspatulate, 1–3(–6) cm × 2–8 mm (distal smaller, oblanceolate to narrowly oblong or linear), bases subclasping, usually decurrent 1–2 mm, margins weakly revolute, faces mostly concolor to weakly bicolor, abaxial gray-tomentose, adaxial usually gray-tomentose, sometimes glabrescent, neither glandular. |
Involucres | turbinate-campanulate, (4–)5–6 mm. |
broadly campanulate, 3–4 mm. |
Pistillate florets | 35–55. |
135–160. |
Bisexual florets | (2–)4–7. |
5–10 (corollas red-tipped). |
Phyllaries | in 3–4(–5) series, whitish (hyaline or opaque, usually shiny, sometimes dull), ovate to ovate-oblong (outer broadly acute, inner rounded-apiculate), glabrous. |
in 3–4 series, silvery gray to yellowish (hyaline), ovate to ovate-oblong, glabrous. |
Heads | in loose to dense, corymbiform to paniculiform arrays. |
in terminal glomerules (1–2 cm diam.). |
Cypselae | ridged, densely papillate-roughened. |
not evidently ridged (conspicuously dotted with whitish, papilliform hairs; pappus bristles loosely coherent basally, released in clusters or easily fragmented rings). |
2n | = 14, 16, 28. |
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Pseudognaphalium thermale |
Pseudognaphalium luteoalbum |
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Phenology | Flowering Jun–Sep(–Oct). | Flowering Apr–Oct. |
Habitat | Dry, sandy road banks, roadside ditches, streambeds and banks, lakeshores, granitic sand, open woods of yellow pine, Jeffrey pine, red fir, Douglas fir, mixed conifer, and mixed evergreen | Roadsides, fields and pastures, ditches, streambanks, seasonal ponds, gardens, and other disturbed sites |
Elevation | (50–)300–2300(–2500) m ((200–)1000–7500(–8200) ft) | 5–2000 m (0–6600 ft) |
Distribution |
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
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AR; AZ; CA; FL; LA; NM; NV; NY; OR; TX; UT; WA; Mexico; Europe; Asia; Africa; Pacific Islands (New Zealand); Australia [Introduced in North America]
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Discussion | Pseudognaphalium luteoalbum is native to Eurasia. It is similar in overall habit to P. stramineum but distinctive in its larger heads and red-tipped corollas (visible through the translucent phyllaries). Cypselae of P. luteoalbum have papilliform hairs; cypselae of other North American species of Pseudognaphalium are glabrous. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 19, p. 419. | FNA vol. 19, p. 418. |
Parent taxa | Asteraceae > tribe Gnaphalieae > Pseudognaphalium | Asteraceae > tribe Gnaphalieae > Pseudognaphalium |
Sibling taxa | ||
Synonyms | Gnaphalium thermale, Gnaphalium canescens subsp. thermale, Gnaphalium johnstonii, Gnaphalium microcephalum var. thermale, Gnaphalium microcephalum subsp. thermale, P. canescens subsp. thermale, P. microcephalum var. thermale | Gnaphalium luteoalbum |
Name authority | (E. E. Nelson) G. L. Nesom: Sida 21: 781. (2004) | (Linnaeus) Hilliard & B. L. Burtt: Bot. J. Linn. Soc. 82: 206. (1981) |
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