Pseudognaphalium luteoalbum
Pseudognaphalium roseum
Jersey cudweed, Jersey rabbit tobacco, red-tip rabbit-tobacco, weedy cudweed
rosy cudweed, rosy rabbit-tobacco
loosely white-tomentose, not glandular.
persistently woolly-tomentose, not glandular.
blades (crowded, internodes 1–5, sometimes to 10 mm) narrowly obovate to subspatulate, 1–3(–6) cm × 2–8 mm (distal smaller, oblanceolate to narrowly oblong or linear), bases subclasping, usually decurrent 1–2 mm, margins weakly revolute, faces mostly concolor to weakly bicolor, abaxial gray-tomentose, adaxial usually gray-tomentose, sometimes glabrescent, neither 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, 3–4 mm.
campanulate, 4–4.5 mm.
135–160.
45–90(–110).
5–10 (corollas red-tipped).
(5–)6–12(–18).
in 3–4 series, silvery gray to yellowish (hyaline), ovate to ovate-oblong, glabrous.
in 5–6 series, usually white, sometimes pink (opaque or hyaline, dull to shiny), ovate to ovate-oblong, glabrous.
in terminal glomerules (1–2 cm diam.).
in corymbiform arrays.
not evidently ridged (conspicuously dotted with whitish, papilliform hairs; pappus bristles loosely coherent basally, released in clusters or easily fragmented rings).
weakly ridged, smooth.
= 14, 16, 28.
Pseudognaphalium luteoalbum
Pseudognaphalium roseum
Pseudognaphalium luteoalbum is native to Eurasia. It is similar in overall habit to P. stramineum but distinctive in its larger heads and red-tipped corollas (visible through the translucent phyllaries). Cypselae of P. luteoalbum have papilliform hairs; cypselae of other North American species of Pseudognaphalium are glabrous.
(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.)
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