Pseudognaphalium luteoalbum
Bot. J. Linn. Soc. 82: 206. 1981.
Annuals, 15–40 cm; taprooted or fibrous-rooted. Stems loosely white-tomentose, not glandular. 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. Heads in terminal glomerules (1–2 cm diam.). Involucres broadly campanulate, 3–4 mm. Phyllaries in 3–4 series, silvery gray to yellowish (hyaline), ovate to ovate-oblong, glabrous. Pistillate florets 135–160. Bisexual florets 5–10 (corollas red-tipped). Cypselae not evidently ridged (conspicuously dotted with whitish, papilliform hairs; pappus bristles loosely coherent basally, released in clusters or easily fragmented rings). 2n = 14, 16, 28.
Phenology: Flowering Apr–Oct.
Habitat: Roadsides, fields and pastures, ditches, streambanks, seasonal ponds, gardens, and other disturbed sites
Elevation: 5–2000 m
Distribution
Ariz., Ark., Calif., Fla., La., Nev., N.Mex., N.Y., Oreg., Tex., Utah, Wash., Mexico, Europe, Asia, Africa, Pacific Islands (New Zealand), Australia.
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.
Selected References
None.