|Photo Ken Hill
|The Cycad Pages
- Ceratozamia kuesteriana Regel, "Bull. Soc. Imp. Naturalistes Moscou 30: 186-188, t. 3, fig. 6; t. 4, fig. 22" (1857).
- "TYPE: ex Horto Petrop., 1856, Regel s.n. (holo LE, iso U)."
Honoring Baron __ von Kuester, patron _?
Described in 1857 by German-born Russian botanist and cycad specialist
Eduard von Regel,
from plants in his collection
in the botanic garden in St Petersbourg. This species
subsequently disappeared from cultivated, reappearing
in the 1970's under the name C. angustifolia. This
was recognised as C. kuesteriana when the wild occurrences
were rediscovered in 1982.
The narrow leaflets and smooth petioles separate this species from
similar species in the genus.
Distribution and habitat:
A narrow endemic in southern Tamaulipas state, Mexico, in pine-oak
dominated cloud forests between 1000 and 1800 meters altitude in the Sierra Madre Oriental.
1997 IUCN Red List of Threatened Plants category V.
|Photo Ken Hill
Plants acaulescent; stem 10-20 cm long, stem 9-13 cm diam; persistent
leaf bases dark, spreading.
Leaves 6-20 in crown. New growth emerging bronze, red or chocolate
brown. Leaves dark green, semiglossy, 80-150 cm long, flat (not keeled) in
section, with 60-100 leaflets; vernation straight; rachis not or slightly
spirally twisted; petiole 20-30 cm long, unarmed.
Leaflets not clustered, linear, symmetric, broadest below middle,
falcate, weakly discolorous, thick or leathery; margins flat; median leaflets
10-30 cm long, 6-15 mm wide.
Pollen cones brown, narrowly ovoid-cylindrical to
fusiform-cylindrical, 9-15 cm long, 2.5-3 cm diam.; peduncle 9-13 cm long;
microsporophyll lamina 9-11 mm long, 6-9 mm wide.
Seed cones green, ovoid-cylindrical, 13.5-19.5 cm long, 6.5-8 cm
diam.; peduncle 12.5-15 cm long; megasporophyll 28-32 mm long, with an expanded
peltate apex 25-32 mm wide.
Seeds ovoid, 16-21 mm long, 12-16 mm wide; sarcotesta white, aging to