Pseudognaphalium leucocephalum
Pseudognaphalium roseum
white cudweed, white rabbit-tobacco
rosy cudweed, rosy rabbit-tobacco
densely and persistently white-tomentose, usually with stipitate-glandular hairs protruding through tomentum.
persistently woolly-tomentose, not glandular.
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 oblong-lanceolate to oblanceolate, mid-cauline 3–7 cm × (3–)6–15(–20) mm, bases clasping to subclasping, not decurrent, margins usually undulate, faces concolor or weakly bicolor, usually woolly-tomentose, sometimes tardily glabrescent adaxially, stipitate- or sessile-glandular beneath tomentum.
broadly campanulate, 5–6 mm.
campanulate, 4–4.5 mm.
66–85.
45–90(–110).
(6–14, California)29–44.
(5–)6–12(–18).
in 5–7 series, bright white (opaque, dull), oblong to oblong-ovate, glabrous.
in 5–6 series, usually white, sometimes pink (opaque or hyaline, dull to shiny), ovate to ovate-oblong, glabrous.
in corymbiform arrays.
in corymbiform arrays.
ridged, smooth.
weakly ridged, smooth.
= 28.
Pseudognaphalium leucocephalum
Pseudognaphalium roseum
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.)
Pseudognaphalium roseum usually grows above 1000 m in Mexico; it grows below 50 m in California, where it is probably adventive. The closest collections of the species southward from California are from Sinaloa and southern Chihuahua. It is abundant in Mexico only in the eastern and southern states.
Pseudognaphalium roseum is recognized by its persistently tomentose stems and leaves, the leaves clasping to subclasping and non-decurrent, weakly bicolor and sessile-glandular beneath the tomentum, often relatively thick stems, relatively large heads with relatively numerous, white or pink, opaque phyllaries, relatively numerous florets, and smooth-faced cypselae. It has been confused with P. canescens; plants of P. roseum with relatively few bisexual florets can be distinguished from P. canescens by their subclasping leaves commonly with closely wavy margins, broader and more numerous phyllaries, and smooth-faced cypselae. Plants from southern California are atypical in their slightly smaller heads.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
WildflowerSearch
iNaturalist
USDA Plants Database
