Amphipappus
chaff-bush
erect (bark whitish), intricately branched, becoming leafless and spinescent, branchlets glabrous or densely, hirtellous.
cauline; alternate (ascending);
petiolate to subsessile;
blades 1-nerved, obovate to narrowly elliptic, margins entire, faces glabrous or hirtellous, often resinous.
turbino-cylindric, 4–5.5 × 2–3 mm.
flat, pitted, epaleate.
(0–)1–2, pistillate, fertile;
corollas yellow (laminae slightly longer than involucres).
3–7, functionally staminate;
corollas yellow, tubes longer than narrowly funnelform throats (nerves 1, yellow, not resinous), lobes 5, reflexed or coiling back, lanceolate;
style-branch appendages triangular (nonfunctional, lacking stigmatic lines).
7–12 in 3 series, greenish white, 1-nerved (outer keeled), ovate to elliptic, unequal, thin-indurate, margins not scarious, faces glabrous.
radiate (discoid), (2–4) in glomerate, terminal clusters, these in corymbiform arrays.
(ray) oblong-elliptic to obovoid, ± flattened, 2-nerved, faces moderately villous;
pappi persistent, of 15–20, stramineous, basally connate, flattened, slender, barbellate, apically attenuate bristles in 1 series (disc bristles longer than ray, sometimes undulate or twisted).
= 9.
Amphipappus
Species 1.
Amphipappus is characterized by its low-shrubby, intricately branched habit and corymbiform, glomerate clusters of small, few-flowered heads, functionally staminate disc florets, and pappi of short, barbellate bristles, the fertile ray cypselae with pappi of shorter, flattened bristles. The genus is restricted to the Mojave Desert of California, Nevada, Utah, and Arizona where these states are contiguous.
Etymology: Greek amphi- , double or two, and pappos, pappus alluding to dimorphic pappi, ray cypselae and disc cypselae
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
WildflowerSearch
iNaturalist
USDA Plants Database
