Pseudognaphalium thermale |
Pseudognaphalium pringlei |
|
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northwestern rabbit-tobacco, slender cudweed, slender false cudweed, small head cudweed, Wright's cudweed |
Pringle's cudweed, Pringle's rabbit-tobacco |
|
Habit | Perennials, (20–)30–70 cm; taprooted. | Annuals or perennials, 30–80 cm; taprooted. |
Stems | loosely tomentose, not glandular. |
lightly white-tomentose and/or glabrescent and green, minutely stipitate- or sessile-glandular beneath other induments. |
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 (not crowded, internodes mostly 5+ mm) oblanceolate-spatulate to obovate- or petiolate-spatulate, 5–10 cm × 10–20 mm (distal oblong to lanceolate or oblanceolate, 2–8 cm, slightly smaller), bases not clasping and decurrent 3–20 mm or clasping and decurrent 1–3 mm or not decurrent at all, margins flat to slightly revolute, faces bicolor, abaxial thinly white-tomentose, adaxial minutely stipitate- or sessile-glandular, otherwise glabrous or glabrate (bases of hairs persistent, enlarged). |
Involucres | turbinate-campanulate, (4–)5–6 mm. |
campanulate to turbinate, 3.5–4 mm. |
Pistillate florets | 35–55. |
15–40(–64). |
Bisexual florets | (2–)4–7. |
(1–)2–6. |
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 2–3 series, silvery white to tawny, oblong to oblong-ovate, (hyaline, shiny), glabrous. |
Heads | in loose to dense, corymbiform to paniculiform arrays. |
in loose, corymbiform arrays. |
Cypselae | ridged, densely papillate-roughened. |
ridged, papillate-roughened. |
Pseudognaphalium thermale |
Pseudognaphalium pringlei |
|
Phenology | Flowering Jun–Sep(–Oct). | Flowering (Aug–)Sep–Nov. |
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 | Rock outcrops and slopes, crevices and thin soil on cliffs, oak or oak-pine woodlands |
Elevation | (50–)300–2300(–2500) m ((200–)1000–7500(–8200) ft) | 1500–2300 m (4900–7500 ft) |
Distribution |
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
|
AZ; NM; TX; Mexico (Chihuahua, Durango, Sonora) |
Source | FNA vol. 19, p. 419. | FNA vol. 19, p. 422. |
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 pringlei |
Name authority | (E. E. Nelson) G. L. Nesom: Sida 21: 781. (2004) | (A. Gray) Anderberg: Opera Bot. 104: 147. (1991) |
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