Arida mattturneri
10–40+, erect to ascending, slender, repeatedly branched, midstems glabrous or sparsely gland-dotted, often stipitate-glandular and sticky-viscid.
basal (rosettes) and cauline;
sessile;
basal blades obovate, 40–60 × 1.5–3.5 mm, greatly reduced distally, bases broadened, margins 2-pinnatifid, faces stipitate-glandular;
distal margins entire or toothed, apices apiculate.
campanulate, 5–6 × 6–8 mm (fresh).
9–13+;
laminae lavender, 10.5–11.5 mm, drooping in flower, coiling after flowering.
40–100+;
corollas yellow, 3.5–4.5 mm.
in 5–6 series, spreading to recurved distally, oblong-lanceolate, 1–6 mm, bases green, margins ± entire, apices green, rounded-acute, faces stipitate-glandular.
10–13 (terminal) in loose, corymbiform arrays.
obovoid-oblong, 1–1.5 mm, 8–12-nerved per face, faces densely sericeous;
pappi: ray 0;
disc white, setose, 3–4 mm.
= 10.
Arida mattturneri
Of conservation concern.
Arida mattturneri is recognized by its basal rosettes of 2-pinnatifid leaves, dense glandular pubescence on stems, leaves, and phyllaries, lavender ray florets, and epappose ray cypselae. The type locality is Blumberg Canyon, Presidio County. Turner and Nesom suggested that A. mattturneri may be related to A. turneri, which also has 2-pinnatifid proximal leaves, or to A. parviflora, which is perennial and sometimes also has epappose ray cypselae but smaller heads.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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