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FNA | Family List | FNA Vol. 20 | Asteraceae | Oonopsis

4. Oönopsis foliosa (A. Gray) Greene, Pittonia. 3: 46. 1896.

Leafy-bracted or leafy goldenweed

Pyrrocoma foliosa A. Gray, Boston J. Nat. Hist. 5: 108. 1845; Haplopappus fremontii A. Gray

Plants 10–40 cm. Stems glabrous or sparsely villosulous. Leaf blades oblanceolate to narrowly obovate or oblong-oblanceolate, (25–)35–100 × (3–)5–15 mm wide, at least distal cauline bases subauriculate and subclasping, distalmost not reduced. Heads immediately subtended by leaflike bracts similar to distal cauline leaves. Involucres 12–25 mm. Phyllary apices long-acuminate to long-acute, not apiculate or cuspidate. Ray florets 15–25(–32) or 0. Disc florets 53–150. Cypselae 5–7 mm, faces glabrous.

Varieties 2 (2 in the flora): Colorado.

Putative hybrids between vars. foliosa and monocephala are highly fertile and show a gradual transition from discoid to radiate morphology, including "elongation of the corolla, changes in the corolla morphology from actinomorphic to bilabiate to radiate, and a reduction to subsequent loss of the androecium in the outer florets...trends observed throughout the putative hybrid swarm" (J. F. Hughes and G. K. Brown 1994).

1 Rays 15–25(–32)   4a Oönopsis foliosa var. foliosa
+ Rays 0   4b Oönopsis foliosa var. monocephala


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