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Key to families | Table of families and genera

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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

W. robusta H. Wendl. MEXICAN FAN PALM
NATURALIZED
Stem: trunk < 30 m, < 80 cm diam. Leaf: to 1 m; petiole red-brown, sharply toothed throughout; thread-like fibers of leaf segment margins inconspicuous or 0. Inflorescence: to 3 m.
Desert washes, disturbed areas, riparian corridors; < 500 m. South Coast; native to Baja California, Sonora. Apr–Jun {Weed listed by Cal-IPC} [Online Interchange]

Previous taxon: Washingtonia filifera
Next taxon: Asparagaceae

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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 2 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=48514, accessed on Sep 2 2014

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Geographic subdivisions indicated for the distribution of Washingtonia robusta Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.