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3b. Yucca baccata var. brevifolia L. D. Benson & R. A. Darrow, Amer. J. Bot. 30: 234. 1943.
Thornber yucca
Yucca brevifolia Schott ex Trelease, Rep. (Annual) Missouri Bot. Gard. 13: 100, plates 57–59. 1902, not Engelmann 1871; Y. arizonica McKelvey; Y. confinis McKelvey; Y. thornberi McKelvey; Y. treleasei J. F. Macbride 1918, not Sprenger 1906
Plants caulescent. Stems 1–24, aerial, often branched, some reaching 2 m. Leaf margins filiferous. Inflorescences arising almost completely within to mostly extending beyond rosettes; peduncle to 0.3 m.
Flowering spring--early summer. Hills, mesas, flats in Sonoran Desert, desert grasslands, oak woodlands, 500--2000 m; Ariz., N.Mex.; Mexico (Sonora).
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