Pseudognaphalium leucocephalum |
Pseudognaphalium californicum |
|
---|---|---|
white cudweed, white rabbit-tobacco |
California cudweed, California everlasting, California rabbit-tobacco, ladies' tobacco |
|
Habit | Biennials or short-lived perennials, 30–60 cm; taprooted. | Annuals, biennials, or perennials, 20–40 cm; taprooted. |
Stems | densely and persistently white-tomentose, usually with stipitate-glandular hairs protruding through tomentum. |
stipitate-glandular, sometimes lightly villous as well. |
Leaf | blades (crowded, internodes mostly 1–3, sometimes to 10 mm) linear-lanceolate, 3–7 cm × 1–5(–6) mm, bases subclasping, not decurrent, margins strongly revolute, faces bicolor, abaxial densely white-tomentose, adaxial green, densely stipitate-glandular. |
blades mostly narrowly oblong-lanceolate, 4–10 cm × 5–10(–20) mm (relatively even-sized distally), bases auriculate-clasping to subclasping or not, decurrent (2–10 mm) or not, margins flat or slightly revolute, faces concolor, mostly green, stipitate-glandular, viscid, sometimes lightly villous as well. |
Involucres | broadly campanulate, 5–6 mm. |
campanulo-globose, 5.5–7 mm. |
Pistillate florets | 66–85. |
105–140. |
Bisexual florets | (6–14, California)29–44. |
7–12. |
Phyllaries | in 5–7 series, bright white (opaque, dull), oblong to oblong-ovate, glabrous. |
in 7–10 series, white (opaque, shiny or dull), broadly ovate to oblong-obovate, glabrous. |
Heads | in corymbiform arrays. |
in corymbiform arrays. |
Cypselae | ridged, smooth. |
ridged, smooth. |
2n | = 28. |
= 28. |
Pseudognaphalium leucocephalum |
Pseudognaphalium californicum |
|
Phenology | Flowering (Jul–)Aug–Nov(–Dec). | Flowering Apr–Jul. |
Habitat | Sandy or gravelly slopes, stream bottoms, arroyos, areas of oak-sycamore, oak-pine, to pine woodlands, commonly in riparian vegetation | Sandy canyons, dry hills, coastal chaparral |
Elevation | 50–2100 m (200–6900 ft) | 60–800 m (200–2600 ft) |
Distribution |
AZ; CA; NM; Mexico (Baja California, Baja California Sur, Chihuahua, Durango, Sinaloa, Sonora)
|
CA; OR; Mexico (Baja California)
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Discussion | Pseudognaphalium leucocephalum is similar to P. viscosum, which has shiny, hyaline, ovate-lanceolate phyllaries, 200–250 pistillate florets, (13–)16–29 bisexual florets, and papillate-roughened cypselae. Some plants of P. leucocephalum also appear to approach P. biolettii in general appearance, and it is possible that some of them may represent hybrids. Plants of P. biolettii differ from P. leucocephalum in their typically eglandular stems, broader, basally ampliate, clasping, more widely spaced, and less densely glandular leaves, and thinner, shiny phyllaries. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Leaf insertion in Pseudognaphalium californicum is unusually variable: bases may be clasping to subclasping without decurrent margins or decurrent and not show any clasping tendency. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 19, p. 423. | FNA vol. 19, p. 423. |
Parent taxa | Asteraceae > tribe Gnaphalieae > Pseudognaphalium | Asteraceae > tribe Gnaphalieae > Pseudognaphalium |
Sibling taxa | ||
Synonyms | Gnaphalium leucocephalum | Gnaphalium californicum, Gnaphalium decurrens var. californicum |
Name authority | (A. Gray) Anderberg: Opera Bot. 104: 147. (1991) | (de Candolle) Anderberg: Opera Bot. 104: 147. (1991) |
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