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Encelia scaposa (Gray) Gray  
Family: Asteraceae
One-Head Brittlebush
[Encelia scaposa var. stenophylla Shinners, moreSimsia scaposa A.Gray]
Encelia scaposa image
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Curtis Clark in Flora of North America (vol. 21)
Perennials, 10-30(-60) cm (caudices 1-2 cm diam.). Stems contracted, at soil surface or ± subterranean (except peduncles). Leaves mostly basal; petioles ± wanting or merging with blades; blades greenish to cinereous, (proximalmost scalelike) mostly narrowly oblanceolate to linear, 30-100 mm (including attenuate bases, mostly 1-8 mm wide), faces ± hirtellous to scabrellous. Heads borne singly. Peduncles ± scabrellous. Involucres 12-22 mm. Phyllaries linear. Ray florets 20-40. Disc corollas yellow, ca. 5 mm. Cypselae (cuneate to obovate) ca. 5 mm (faces ± villous); pappi (readily falling) of 2 (± villous) bristlelike awns. Flowering Mar-Apr. Rocky, desert slopes; 1300-1700 m; N.Mex., Tex. Although Encelia scaposa traditionally has been included within Encelia, it seems misplaced here. Its cypselae differ from those of other encelias in lacking a narrowed apical notch and in having more or less villous (rather than mostly glabrous) faces. Molecular evidence suggests that it may be closer to Flourensia than to members of the alliance comprising Encelia, Enceliopsis, and Geraea.

Encelia scaposa
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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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