|The Cycad Pages
- Ceratozamia norstogii D.W. Stev., "Brittonia 34: 181-184, figs. 1-2." (1982).
- "TYPE: Mexicoa, Chiapas, shady forests near Rancho Fenia, Mar-Apr 1925, C.A. Purpus 6 (holo NY, iso US, F)."[NY]
Honoring American botanist and eminent student of cycads Knut Norstog.
Named in 1982 by American botanist Dennis Stevenson, although known
since as early as 1925.
Narrow leaflets, longer leaves often but not always twisted, prickly rachis.
Distribution and habitat:
A narrow endemic in Chiapas state, Mexico, in seasonally dry pine-oak forests
in the Sierra Madre del Sul.
1997 IUCN Red List of Threatened Plants category V.
|Photo Ken Hill
Plants arborescent, or acaulescent; stem 12-130 cm long, stem 13-22 cm
Leaves 5-15 in crown. New growth emerging bronze, red or chocolate
brown. Leaves dark green, semiglossy, 69-135 cm long, flat (not keeled) in
section, with 66-130 leaflets; vernation straight; rachis distinctly spirally
twisted; petiole 9-39 cm long, armed with prickles.
Leaflets not clustered, linear, symmetric, broadest below middle,
falcate, strongly discolorous, thick or leathery; margins incurved; median
leaflets 22-57 cm long, 3-5 mm wide.
Pollen cones yellow-green, narrowly ovoid-cylindrical, 25-36 cm long,
3.8-5.1 cm diam.; peduncle 4.5 cm long; microsporophyll lamina 10-14 mm long,
8-11 mm wide, with two horns 1-2 mm long.
Seed cones brown, ovoid-cylindrical, 21-37 cm long, 9-13 cm diam.;
peduncle 6-10 cm long; megasporophyll 41-55 mm long, with an expanded peltate
apex 38-52 mm wide, with two horns 2-6 mm long.
Seeds ovoid, 24-29 mm long, 15-21 mm wide; sarcotesta white, aging to