Micropus californicus
cottontop, q-tips, slender cotton-weed, slender cottonseed
depressed-spheric, mostly 0.3–0.6 mm, heights 0.5–0.8 times diams.
depressed-spheric, 2–4 × 3–6 mm.
1.4–2.6 mm, corolla scars ± median;
pappi: staminate 0 or of 1, ± smooth bristle 0.9–1.5 mm.
paleae 4–7(–8) in 1 series, longest 2–4 mm;
wings obscure, withering, lateral, ± erect, narrowly oblanceolate, involute;
bodies galeate, cartilaginous to bony throughout, sericeous to lanuginose.
paleae 0.; staminate corollas 1–2 mm, lobes usually 5.
Micropus californicus
Varieties 2 (2 in the flora).
Though common and often found on recent disturbances within its range, Micropus californicus does not appear to be particularly invasive or weedy. The mature pistillate paleae, with roughly the profile of a harp or of an inverted lower-case letter “q,” are distinctive. That shape and the accompanying dense, cottony indument of the common variety explain the vernacular names. By contrast, pistillate paleae of M. amphibolus have roughly the profile of a human head wearing a billed cap.
Within the more limited range of var. subvestitus, the two varieties are broadly sympatric, usually in separate populations, occasionally in mixed populations that sometimes include intermediate plants.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Pistillate paleae densely and loosely lanuginose, longest usually 3–4 mm | var. californicus |
1. Pistillate paleae thinly sericeous-lanuginose, longest usually 2–3 mm | var. subvestitus |
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