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The Cycad Pages
Ceratozamia whitelockiana

Ceratozamia whitelockiana Chemnick & T.J. Greg., Phytologia (1995) 79(1): 51-57 (1996).
"TYPE: Mexico, Oaxaca, vicinity of Metates, S of Valle Nacional, May 1995, Chemnick & Gregory 5 (holo HNT, iso FTG, XALU)."


Etymology: Honoring Loran Whitelock of Los Angeles, California, eminent student and collector of cycads.

Historical notes: Named in 1996 by American botanists Jeff Chemnick and Timothy Gregory.

Distinguishing features: Few leaves with thin, long and wide leaflets, short unbranched trunks.

Distribution and habitat: A narrow endemic in Oaxaca state, Mexico, on steep slopes in evergreen cloud forests in the Rio Valle Nacional.

Conservation status: Endangered. Not listed by the 1997 IUCN Red List of Threatened Plants.
Photo Ken Hill

Description:

Plants acaulescent; stem 20-30 cm long, stem 12-18 cm diam; persistent leaf bases dark, spreading.

Leaves 8-12 in crown. New growth emerging light green or bluish. Leaves light or bright green, semiglossy, 200-250 cm long, flat (not keeled) in section, with 60-80 leaflets; vernation straight; rachis not or slightly spirally twisted; petiole 100-125 cm long, unarmed.

Leaflets not clustered, linear, symmetric, broadest below middle, falcate, weakly discolorous, thin or membranous; margins flat; median leaflets 30-50 cm long, 30-38 mm wide.

Cataphylls 50 mm long.

Pollen cones yellow-green, fusiform-cylindrical, 26-28 cm long, 1.5-2.8 cm diam.; peduncle 2-3 cm long; microsporophyll lamina 8 mm long, 3 mm wide.

Seed cones yellow-green, ovoid-cylindrical, 35 cm long, 12 cm diam.; peduncle 3-4 cm long.

Seeds ovoid, 31-33 mm long, 25-27 mm wide; sarcotesta white, aging to brown.


The Cycad Pages

© 1998-2012 Royal Botanic Gardens Sydney
Written and maintained by Ken Hill 1998-2010
Maintained by Leonie Stanberg and Dennis Stevenson 2010-2012
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