Flora of North America species comparison

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Pseudognaphalium leucocephalum

Pseudognaphalium biolettii

white cudweed, white rabbit-tobacco

Bioletti's rabbit-tobacco, two-color rabbit-tobacco, two-tone everlasting
Habit Biennials or short-lived perennials, 30–60 cm; taprooted. Perennials (fragrant), 20–70(–120) cm; taprooted.
Stems

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

(sometimes lignescent near bases) proximally glabrescent, distally persistently tomentose, at least in the region of the heads, 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 (not crowded, internodes mostly 5+ mm), oblong-oblanceolate to oblanceolate (the distal lanceolate), 1.5–5(–8) cm × 4–10(–15) mm, bases auriculate-clasping, not decurrent, margins flat or slightly revolute, often undulate, faces bicolor (at least basal and proximal cauline), abaxial white-tomentose, adaxial bright green and ± densely glandular.
Involucres

broadly campanulate, 5–6 mm.

turbinate-campanulate, 5–5.5(–6) mm.
Pistillate florets

66–85.

41–73.
Bisexual florets

(6–14, California)29–44.

5–13.
Phyllaries

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

in 4–5 series, white or sometimes slightly pinkish (opaque, shiny), ovate to oblong-ovate or oblong (often longitudinally wrinkled or grooved), glabrous.
Heads

in corymbiform arrays.

in corymbiform arrays.
Cypselae

ridged, smooth.

ridged, smooth.
2n

= 28.

Pseudognaphalium leucocephalum

Pseudognaphalium biolettii
Phenology Flowering (Jul–)Aug–Nov(–Dec). Flowering Apr–Jun(–Oct).
Habitat Sandy or gravelly slopes, stream bottoms, arroyos, areas of oak-sycamore, oak-pine, to pine woodlands, commonly in riparian vegetation Rocky slopes, roadsides, sandy plains with Larrea, coastal strand, matorral, and chaparral
Elevation 50–2100 m (200–6900 ft) 5–600(–1200) m (0–2000(–3900) ft)
Distribution
from FNA
AZ; CA; NM; Mexico (Baja California, Baja California Sur, Chihuahua, Durango, Sinaloa, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; Mexico (Baja California, Baja California Sur)
[WildflowerSearch map]
[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.)
Source FNA vol. 19, p. 423. FNA vol. 19, p. 423.
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. austrotexanum, P. beneolens, 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 Gnaphalium bicolor
Name authority (A. Gray) Anderberg: Opera Bot. 104: 147. (1991) Anderberg: Opera Bot. 104: 147. (1991)
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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