Pseudognaphalium helleri
Pseudognaphalium saxicola
Heller's cudweed, Heller's rabbit-tobacco
cliff cudweed
greenish, glandular-villous (without persistent tomentum, stipitate glands mostly 0.3–1 mm, often variable, stalks broadened toward bases, about equaling gland widths).
(filiform) persistently tomentose (indument a loose, envelope-like, transparent haze of extremely thin hairs, doubling apparent stem width), not glandular.
blades mostly oblong-lanceolate, 2.5–7 cm × 4–20 mm, bases not clasping, not decurrent, margins flat, faces bicolor, abaxial white to gray with lightly persistent tomentum, adaxial green, both minutely stipitate-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).
campanulate, 6–7 mm.
turbinate, 4–5 mm.
83–107.
25–28.
9–15.
6–7.
in 4–6 series, white (opaque, shiny), ovate to ovate-oblong or oblong, ± tomentose.
in 3(–4) series, whitish to slightly tawny (hyaline, shiny), narrowly triangular to narrowly oblong-triangular, glabrous.
in corymbiform arrays.
(2–4) in terminal, capitate clusters (usually immediately subtended by distalmost cauline leaf, clusters sometimes in subcorymbiform arrays).
ridged, smooth.
not ridged, smooth.
Pseudognaphalium helleri
Pseudognaphalium saxicola
Pseudognaphalium helleri and P. micradenium are similar to P. obtusifolium in most features; both differ in their glandular stems without the persistent whitish tomentum of P. obtusifolium.
(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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