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2a. Chaenactis carphoclinia A. Gray var. carphoclinia
Chaenactis carphoclinia var. attenuata (A. Gray) M. E. Jones
Plants (5–)10–30(–40) cm. Leaves basal (± withering) and cauline, longest 1–6(–7) cm; petioles scarcely dilated proximally, ± herbaceous. 2n = 16.
Flowering Jan–Jun. Open, rocky or gravelly (sometimes sandy) desert slopes and flats, shrublands; -90–1900 m; Ariz., Calif., Nev., N.Mex., Utah; Mexico (Baja California, Sonora).
Variety carphoclinia is one of the most abundant spring wildflowers in the Sonoran Desert; it extends to the southern Great Basin and northwestern Chihuahuan Desert. It is reported to be eaten by desert tortoises (Gopherus agassizii Cooper). Some stunted forms have been named var. attenuata; such forms recur in the most arid (or otherwise severe) habitats throughout the range of the species.
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