Pseudognaphalium thermale |
Pseudognaphalium stramineum |
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northwestern rabbit-tobacco, slender cudweed, slender false cudweed, small head cudweed, Wright's cudweed |
cotton-batting cudweed, cotton-batting false cudweed, cotton-batting-plant |
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Habit | Perennials, (20–)30–70 cm; taprooted. | Annuals or biennials, 30–60(–80) cm; taprooted. |
Stems | loosely tomentose, not glandular. |
(1+ from base, erect to ascending) loosely 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 usually 1–5, sometimes to 10 mm) oblong to narrowly oblanceolate or subspatulate, 2–8(–9.5) cm × 2–5(–10) mm (smaller distally, narrowly lanceolate to linear), bases subclasping, usually not decurrent, sometimes decurrent 1–2 mm, margins flat or slightly revolute, faces concolor, loosely and persistently gray-tomentose, not glandular. |
Involucres | turbinate-campanulate, (4–)5–6 mm. |
subglobose, 4–6 mm. |
Pistillate florets | 35–55. |
160–200. |
Bisexual florets | (2–)4–7. |
[8–]18–28. |
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 4–5 series, whitish (often yellowish with age, hyaline, shiny), ovate to oblong-obovate, glabrous. |
Heads | in loose to dense, corymbiform to paniculiform arrays. |
in terminal glomerules (1–2 cm diam.). |
Cypselae | ridged, densely papillate-roughened. |
weakly, if at all, ridged (otherwise smooth or papillate-roughened, glabrous, without papilliform hairs; pappus bristles loosely coherent basally, released in clusters or easily fragmented rings). |
2n | = 28. |
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Pseudognaphalium thermale |
Pseudognaphalium stramineum |
|
Phenology | Flowering Jun–Sep(–Oct). | Flowering Mar–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 | Sandy fields, streamsides, washes, swales, dunes, chaparral slopes, roadsides, fields, disturbed places, moist disturbed places |
Elevation | (50–)300–2300(–2500) m ((200–)1000–7500(–8200) ft) | 10–1600 m (0–5200 ft) |
Distribution |
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
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AZ; CA; CO; ID; MT; NC; NE; NM; NV; NY; OK; OR; SC; TX; UT; VA; WA; WY; BC; Mexico; South America
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Discussion | Pseudognaphalium stramineum is probably native from South America to western North America; it is adventive in sandy fields on the Atlantic coastal plain, where it flowers May–Aug. (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 stramineum, Gnaphalium chilense, Gnaphalium chilense var. confertifolium, Gnaphalium gossypinum, Gnaphalium lagopodioides, Gnaphalium proximum, Gnaphalium sulphurescens |
Name authority | (E. E. Nelson) G. L. Nesom: Sida 21: 781. (2004) | (Kunth) Anderberg: Opera Bot. 104: 148. (1991) |
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