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AGAVACEAE CENTURY PLANT FAMILY

Dale W. McNeal, except as noted

Perennial herb, shrub, tree, fibrous succulent or not, from bulbs or rhizomes. Stem: above ground or not, branched or not. Leaf: simple, deciduous or not, basal or in terminal rosettes, generally sessile, linear, lanceolate, oblanceolate or ovate, fibrous or not, thin and flexible or thick and rigid or succulent; margin entire, fine-serrate, dentate, or with filaments, tips rigid or flexible, with a spine or not. Flower: bisexual; perianth parts 6, in 2 petal-like whorls, free or ± fused; stamens 6, ± fused to perianth, filaments often wide, succulent; ovary superior or inferior, chambers 3, style 1 (thick, poorly defined), stigma head-like or 3-lobed. Fruit: capsule, indehiscent, loculicidal, or septicidal. Seed: few to many, ± flat or ovoid, generally black.
23 genera, 637 species: worldwide. —Scientific Editors: Dale W. McNeal, Thomas J. Rosatti.

Key to Agavaceae

HESPEROYUCCA QUIXOTE PLANT, CHAPARRAL YUCCA

William J. Hess

Shrub-like, dying after fruiting or not; rosettes >=1, clumped or not. Leaf: linear to narrow-lanceolate, thick, ± rigid, glaucous, spine-tipped, margins ± yellow, fine-toothed. Inflorescence: scapose, panicle, cylindric, glabrous, exceeding rosettes; peduncle generally > 2.5 cm wide; bracts generally reflexed. Flower: bisexual; perianth bell-shaped or spheric, parts free, wide-lanceolate, white to ± green or purple-tinged; stamens thick, generally > pistil; ovary superior, stigma head-like. Fruit: erect, obovoid, loculicidal. Seed: many per chamber, 6–9 mm diam, thin, flat, dull black.
x=30.
3 species: Arizona, California, northern Mexico. (Greek: western yucca)
Unabridged etymology: (Greek: hesperos (western), yucca)
Unabridged references: [Baker 1892 Bull. Misc. Inform. Kew 1892:8]

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Next taxon: Hesperoyucca whipplei

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Aug 21 2014
Citation for this treatment: [Author of taxon treatment] 2013. Hesperoyucca, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=68626, accessed on Aug 21 2014

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