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Washingtonia
Family: Arecaceae
Washingtonia image
Anne Barber
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Scott Zona in Flora of North America (vol. 22)


The two species are easy to distinguish when cultivated side by side, but they are sometimes difficult to identify from herbarium specimens. Analysis of flavonoids (S. Zona and R. Scogin 1988) can reliably distinguish the two species.

JANAS 32(1)
PLANT: Unbranched trees to 25 m tall, usually with persistent dead droop¬ing leaves forming a skirt. LEAVES: fan-shaped to 1 m broad, palmately dissected into 40-60 segments, their margins commonly with slender filaments; petioles to 1 m long, flattened, projecting into the blade as a winged arrowhead point, the margins usually spine-bearing. INFLORESCENCE: 3-4 m long. FLOWERS: numerous, perfect, white, 7-10 mm long; calyx lobes erect; corolla lobes reflexed; stamens 6; pistil 3-lo¬culed. FRUITS: dry, hard, ellipsoid drupes, 5-10 mm long. NOTES: 2 spp.; AZ, CA; nw Mex. (for G. Washington). Bailey, L. H. 1936. Gentes Herbarum 4:53-82. REFERENCES: Mason, Charles T., Jr. 1999. Arecaceae. Ariz.-Nev. Acad. Sci. 32(1).
Species within checklist: ASU - BIO 313 - Flora of Arizona campus plants 2018
Washingtonia ambigua
Images
not available
Map not
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Washingtonia brevipes
Image of Washingtonia brevipes
Map not
Available
Washingtonia claytonii
Image of Washingtonia claytonii
Map not
Available
Washingtonia filifera
Image of Washingtonia filifera
Map not
Available
Washingtonia occidentalis
Image of Washingtonia occidentalis
Map not
Available
Washingtonia purpurea
Images
not available
Map not
Available
Washingtonia robusta
Image of Washingtonia robusta
Map not
Available

This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].
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