Pseudognaphalium leucocephalum
Pseudognaphalium canescens
white cudweed, white rabbit-tobacco
slender cudweed, Wright's cudweed, Wright's rabbit-tobacco
densely and persistently white-tomentose, usually with stipitate-glandular hairs protruding through tomentum.
persistently tomentose, not glandular (2–3 mm diam. near bases).
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 narrowly to broadly oblanceolate, mostly 2–4(–5) cm × 2–8(–15) mm, bases not clasping, not decurrent, margins flat, faces weakly bicolor, tomentose (adaxial less densely tomentose, sometimes sessile-glandular beneath tomentum).
broadly campanulate, 5–6 mm.
turbinate-campanulate, 4–5 mm.
66–85.
(16–)24–44.
(6–14, California)29–44.
(1–)2–5(–6), 5–6 more common in northern part of range.
in 5–7 series, bright white (opaque, dull), oblong to oblong-ovate, glabrous.
in 3–4 series, white (opaque to hyaline, dull to shiny), narrowly ovate-lanceolate, glabrous.
in corymbiform arrays.
usually in loose, corymbiform arrays.
ridged, smooth.
ridged, weakly papillate-roughened.
= 28.
= 28.
Pseudognaphalium leucocephalum
Pseudognaphalium canescens
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.)
Most plants of Pseudognaphalium canescens produce white, opaque, keeled, apiculate phyllaries; in the southern portion of its range (Jalisco southeastward) and scattered localities elsewhere, the phyllaries may be more hyaline and lack a pronounced keel and apiculum.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
WildflowerSearch
iNaturalist
USDA Plants Database
OR
Flora NW
PNW Herbaria
