Oönopsis foliosa

(A. Gray) Greene

Pittonia 3: 46. 1896.

Common names: Leafy-bracted or leafy goldenweed
Basionym: Pyrrocoma foliosa A. Gray Boston J. Nat. Hist. 5: 108. 1845
Synonyms: Haplopappus fremontii A. Gray
Treatment appears in FNA Volume 20. Treatment on page 412. Mentioned on page 411.

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.

Discussion

Varieties 2 (2 in the flora).

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).

Selected References

None.