Flora of North America species comparison

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Pseudognaphalium leucocephalum

Pseudognaphalium austrotexanum

white cudweed, white rabbit-tobacco

South Texas rabbit-tobacco, Texas rabbit-tobacco
Habit Biennials or short-lived perennials, 30–60 cm; taprooted. Annuals, 30–70 cm; taprooted.
Stems

densely and persistently white-tomentose, usually with stipitate-glandular hairs protruding through tomentum.

densely and closely white-tomentose-floccose, glabrescent, not glandular.
Leaf

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 (crowded, internodes mostly 1–3, sometimes to 10 mm) linear to linear-lanceolate, 2–5 cm × 1–3 mm, bases subclasping, not decurrent, margins strongly revolute, sometimes closely sinuate, faces bicolor, abaxial densely and closely white-tomentose, adaxial green, densely stipitate-glandular, otherwise glabrate.
Involucres

broadly campanulate, 5–6 mm.

broadly campanulate, 4.5–5 mm.
Pistillate florets

66–85.

[46–]76–102.
Bisexual florets

(6–14, California)29–44.

(6–)8–11.
Phyllaries

in 5–7 series, bright white (opaque, dull), oblong to oblong-ovate, glabrous.

in 5–7 series, silvery white (hyaline, shiny), narrowly ovate to oblong or elliptic (apices of inner thickened and slightly raised along midribs, apiculate), glabrous.
Heads

in corymbiform arrays.

in corymbiform arrays.
Cypselae

ridged, smooth.

ridged, papillate-roughened.
2n

= 28.

Pseudognaphalium leucocephalum

Pseudognaphalium austrotexanum
Phenology Flowering (Jul–)Aug–Nov(–Dec). Flowering Oct–Dec(–Jan).
Habitat Sandy or gravelly slopes, stream bottoms, arroyos, areas of oak-sycamore, oak-pine, to pine woodlands, commonly in riparian vegetation Sandy soil in pastures, grasslands, open disturbed sites
Elevation 50–2100 m (200–6900 ft) 0–10[–600] m (0–0[–2000] ft)
Distribution
from FNA
AZ; CA; NM; Mexico (Baja California, Baja California Sur, Chihuahua, Durango, Sinaloa, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico (Nuevo León)
[BONAP county map]
Discussion

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 austrotexanum is similar to P. viscosum in general appearance: taprooted annuals with stems white-tomentose, strictly erect, and mostly unbranched proximal to heads, leaves linear to linear-lanceolate, strongly bicolor (green and glandular adaxially, white-tomentose abaxially), loosely to strictly ascending, crowded on relatively short internodes and continuing to immediately proximal to the heads, and basally subclasping but not strongly auriculate, phyllaries silvery white, thin, and hyaline, and cypselae minutely papillate-roughened.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 423. FNA vol. 19, p. 422.
Parent taxa Asteraceae > tribe Gnaphalieae > Pseudognaphalium Asteraceae > tribe Gnaphalieae > Pseudognaphalium
Sibling taxa
P. arizonicum, P. austrotexanum, P. beneolens, P. biolettii, P. californicum, P. canescens, P. helleri, P. jaliscense, P. luteoalbum, P. macounii, P. micradenium, P. microcephalum, P. obtusifolium, P. pringlei, P. ramosissimum, P. roseum, P. saxicola, P. stramineum, P. thermale, P. viscosum
P. arizonicum, P. beneolens, P. biolettii, P. californicum, P. canescens, P. helleri, P. jaliscense, P. leucocephalum, P. luteoalbum, P. macounii, P. micradenium, P. microcephalum, P. obtusifolium, P. pringlei, P. ramosissimum, P. roseum, P. saxicola, P. stramineum, P. thermale, P. viscosum
Synonyms Gnaphalium leucocephalum
Name authority (A. Gray) Anderberg: Opera Bot. 104: 147. (1991) G. L. Nesom: Sida 19: 507, fig. 1. (2001)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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