Arida arizonica
arid tansyaster, desert tansy-aster, Silver Lake daisy
usually 1, sometimes 2–6+, erect to ascending, slender, usually much branched from base, divaricately so, densely hispiduloso-glandular, viscid.
basal and cauline;
proximal petiolate, distal sessile, often clasping;
blades oblanceolate to oblong, reduced distally, 10–50(–70) × 1–25 mm, herbaceous, margins coarsely dentate or pinnatifid, apices of teeth or lobes spiny-tipped, faces glandular-hispidulous.
hemispheric, 4–5 × 6–8 mm (fresh).
20–35+;
laminae lavender to whitish, 5–7 mm, coiling after flowering.
25–40+;
corollas yellow, 3–6 mm.
in 2–3 series, appressed to reflexed distally, lanceolate, 1–5 mm, bases whitish, margins ± entire, apices green or sometimes purplish, acute, faces hispiduloso-glandular.
borne singly (terminal),often in loose, leafy, corymbiform arrays.
oblanceolate, 1.4–2 mm, smooth, faces sparsely sericeous;
pappi: ray 0;
disc white, terete, 1.5–3 mm.
= 10.
Arida arizonica
Arida arizonica is a widespread and variable species recognized by its annual habit, deeply lobed or pinnatifid leaves, dense glandularity, relatively small heads with lavender to whitish ray florets, and absence of pappi on the ray florets.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
WildflowerSearch
iNaturalist
USDA Plants Database
