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ARECACEAE (Palmae) PALM FAMILY

Scott Simono

[Subshrub, shrub], tree, evergreen; dioecious (monoecious), or flowers bisexual. Stem: erect [subterranean, creeping, climbing], slender to massive, smooth or covered with fibrous or prickly remains of leaf bases. Leaf: palmately or pinnately dissected or compound, alternate, forming a terminal crown; base sheathing; petiole generally long; blade including leaflets folded lengthwise. Inflorescence: panicle (spike), axillary; peduncle sheathed by 1+ large bracts; flowers many, generally ± sessile. Flower: generally small, ± radial; sepals, petals each generally 3, similar or not, fused at base or free; stamens generally 6; pistils 1, compound, or 3, simple, ovaries superior, if 1, generally 3-chambered, styles free or fused. Fruit: generally a drupe, fleshy or dry. Seed: generally 1.
1914 genera, 2500 species: tropics, subtropics. [Zona 2000 FNANM 22:95–123] Cult worldwide for food, ornamental, building material. —Scientific Editor: Bruce G. Baldwin.
Unabridged references: [Uhl & Dransfield 1987 Genera Palmarum; Zona 2000 FNANM 22:95–123]

Key to Arecaceae

WASHINGTONIA FAN PALM
Leaf: petiole 1–2 m, generally armed, bases persistent on trunk; blade 1–2 m, generally persistent as brown "skirt," palmately divided nearly to middle, segments 40–60, margins folded upward, with thread-like fibers, tips ± reflexed. Inflorescence: within crown, > leaves, flowers borne singly. Flower: bisexual; calyx lobes ± erect; corolla lobes reflexed, white; pistil 1, ovary 3-lobed. Fruit: drupe, oblong or ovate, black, ± fleshy.
2 species: deserts of southern California, Arizona, northern Mexico. (George Washington, 1st president of USA, 1732–1799)
Unabridged references: [Clarke et al. 2007 Flora of the Santa Ana River and Environs; Henderson et al. 1995 Field guide to the Palms of the Americas; McCurrach 1960 Palms of the World: 264–265; Zona 2000 FNANM 22:105–106]

Key to Washingtonia

Previous taxon: Syagrus romanzoffiana
Next taxon: Washingtonia filifera

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 14 2014
Citation for this treatment: [Author of taxon treatment] 2013. Washingtonia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=10810, accessed on Sep 14 2014

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