|The Cycad Pages
- Ceratozamia alvarezii "Pérez-Farrera, Vovides & Iglesias", Novon 9(3): 410-413 (1999).
- "TYPE: Mexico, Chiapas, Sierra Madre, 4 Mar 1996, M.A. Pérez-Farrera 889 (holo CHIP, iso F, MEXU, MO)."
Named after the Mexican conservationist
Miguel Alvarez del Toro.
A small highly branched Ceratozamia species
thought to be related to C. matudae.
C. alvarezii is distinguished from C. matudae by
the more branched habit and the thick erect peduncle of the
female cones (the peduncle is long, thin and decumbent in C. matudae).
C sabatoi differs in having wider, longer leaflets and bluish
seed cones. C. norstogii is a larger plant
with an unbranched trunk and spirally twisted leaf rachises.
Distribution and habitat:
Known only from a small area in the Sierra Madre de Chiapas,
in moist pine-oak forest with a fern rich ground layer at about 950 m elevation.
Considered to be endangered by habitat loss as the forests are
being cleared for agriculture.
Not listed by the
1997 IUCN Red List of Threatened Plants.
Plants acaulescent (branching freely); stem 10-50 cm long, stem 9-18
Leaves 4-18 in crown. New growth emerging bronze, red or chocolate
brown. Leaves dark green, semiglossy, 50-110 cm long, flat (not keeled) in
section, with 24-62 leaflets; vernation straight; rachis not or slightly
spirally twisted; petiole 14-42 cm long.
Leaflets not clustered, linear, symmetric, broadest below middle, not
falcate, strongly discolorous, thick or leathery; margins flat; median leaflets
16-33 cm long, 4-9 mm wide.
Cataphylls 21-50 mm long, brown.
Pollen cones yellow-green (to cream), narrowly ovoid-cylindrical,
11-31 cm long, 2.5-4.5 cm diam.; peduncle 4-5 cm long; microsporophyll lamina
14-17 mm long, 6-9 mm wide.
Seed cones brown, ovoid-cylindrical, 14.5-19 cm long, 5.7-10.5 cm
diam.; peduncle 4.5-6.5 cm long; megasporophyll 28-45 mm long, with an expanded
peltate apex 15-29 mm wide.
Seeds ovoid, 17-25 mm long, 17-20 mm wide; sarcotesta white, aging to