Flora of North America species comparison

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Pseudognaphalium luteoalbum

Pseudognaphalium leucocephalum

Jersey cudweed, Jersey rabbit tobacco, red-tip rabbit-tobacco, weedy cudweed

white cudweed, white rabbit-tobacco
Habit Annuals, 15–40 cm; taprooted or fibrous-rooted. Biennials or short-lived perennials, 30–60 cm; taprooted.
Stems

loosely white-tomentose, not glandular.

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

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 (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.
Involucres

broadly campanulate, 3–4 mm.

broadly campanulate, 5–6 mm.
Pistillate florets

135–160.

66–85.
Bisexual florets

5–10 (corollas red-tipped).

(6–14, California)29–44.
Phyllaries

in 3–4 series, silvery gray to yellowish (hyaline), ovate to ovate-oblong, glabrous.

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

in terminal glomerules (1–2 cm diam.).

in corymbiform arrays.
Cypselae

not evidently ridged (conspicuously dotted with whitish, papilliform hairs; pappus bristles loosely coherent basally, released in clusters or easily fragmented rings).

ridged, smooth.
2n

= 14, 16, 28.

= 28.

Pseudognaphalium luteoalbum

Pseudognaphalium leucocephalum
Phenology Flowering Apr–Oct. Flowering (Jul–)Aug–Nov(–Dec).
Habitat Roadsides, fields and pastures, ditches, streambanks, seasonal ponds, gardens, and other disturbed sites Sandy or gravelly slopes, stream bottoms, arroyos, areas of oak-sycamore, oak-pine, to pine woodlands, commonly in riparian vegetation
Elevation 5–2000 m (0–6600 ft) 50–2100 m (200–6900 ft)
Distribution
from FNA
AR; AZ; CA; FL; LA; NM; NV; NY; OR; TX; UT; WA; Mexico; Europe; Asia; Africa; Pacific Islands (New Zealand); Australia [Introduced in North America]
[WildflowerSearch map]
from FNA
AZ; CA; NM; Mexico (Baja California, Baja California Sur, Chihuahua, Durango, Sinaloa, Sonora)
[WildflowerSearch map]
[BONAP county map]
Discussion

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 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. 418. 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. leucocephalum, 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. 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
Synonyms Gnaphalium luteoalbum Gnaphalium leucocephalum
Name authority (Linnaeus) Hilliard & B. L. Burtt: Bot. J. Linn. Soc. 82: 206. (1981) (A. Gray) 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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