Pseudognaphalium luteoalbum
Pseudognaphalium saxicola
Jersey cudweed, Jersey rabbit tobacco, red-tip rabbit-tobacco, weedy cudweed
cliff cudweed
loosely white-tomentose, not glandular.
(filiform) persistently tomentose (indument a loose, envelope-like, transparent haze of extremely thin hairs, doubling apparent stem width), 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 elliptic-oblanceolate to oblanceolate, 0.5–3 cm × 2–6 mm (largest at midstem), bases not clasping, not decurrent, margins flat, faces concolor, green, thinly arachnoid-tomentose to glabrate, not glandular (veiny reticulum evident).
broadly campanulate, 3–4 mm.
turbinate, 4–5 mm.
135–160.
25–28.
5–10 (corollas red-tipped).
6–7.
in 3–4 series, silvery gray to yellowish (hyaline), ovate to ovate-oblong, glabrous.
in 3(–4) series, whitish to slightly tawny (hyaline, shiny), narrowly triangular to narrowly oblong-triangular, glabrous.
in terminal glomerules (1–2 cm diam.).
(2–4) in terminal, capitate clusters (usually immediately subtended by distalmost cauline leaf, clusters sometimes in subcorymbiform arrays).
not evidently ridged (conspicuously dotted with whitish, papilliform hairs; pappus bristles loosely coherent basally, released in clusters or easily fragmented rings).
not ridged, smooth.
= 14, 16, 28.
Pseudognaphalium luteoalbum
Pseudognaphalium saxicola
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 saxicola probably is an evolutionary derivative of P. obtusifolium. Plants of P. saxicola are relatively small and have relatively few, relatively small heads and occur in a specialized habitat; they constitute the only narrowly endemic species of Pseudognaphalium in the United States. Depauperate individuals of P. obtusifolium from localities over its whole geographic range may sometimes be as short as 5–10 cm and similar in habit to P. saxicola; such plants differ from P. saxicola in their close and denser stem vestiture, bicolor and relatively narrow leaves, larger heads with greater numbers of pistillate florets, and broader phyllaries with rounded apices.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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