Pseudognaphalium leucocephalum
Pseudognaphalium micradenium
white cudweed, white rabbit-tobacco
delicate rabbit-tobacco, Weatherby's rabbit-tobacco
densely and persistently white-tomentose, usually with stipitate-glandular hairs protruding through tomentum.
glandular-puberulent (without persistent tomentum), stipitate glands 0.1–0.2 mm, stalks narrower than gland widths.
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 linear to linear-lanceolate or linear-oblanceolate, 1.5–5.5 cm × 1.5–10 mm, bases not clasping, not decurrent, margins flat, faces bicolor, abaxial white to gray, tomentose, adaxial green, both minutely stipitate-glandular.
broadly campanulate, 5–6 mm.
turbinate-campanulate, 5–6 mm.
66–85.
47–78.
(6–14, California)29–44.
(7–)11–20.
in 5–7 series, bright white (opaque, dull), oblong to oblong-ovate, glabrous.
in 4–6 series, white to tawny white (hyaline, shiny), narrowly ovate to oblong, glabrous.
in corymbiform arrays.
in corymbiform arrays.
ridged, smooth.
ridged, smooth.
= 28.
Pseudognaphalium leucocephalum
Pseudognaphalium micradenium
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 micradenium has a more northern and Appalachian distribution than P. helleri. A report of P. micradenium for Louisiana probably was based on specimens of P. helleri. The two species differ in vestiture and other features; stems of P. micradenium are more slender than those of its close relatives.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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