|Photo Knut Norstog
|The Cycad Pages
- Zamia neurophyllidia D.W. Stev., "Brittonia 45(1): 10, fig. 5" (1993).
- "TYPE: Panama, Bocas del Tora, 7 Jan 1989, M. Correa et al. 3078 (holo PMA iso NY)."
The epithet is derived from the strongly nerved appearance of the leaflets.
Zamia neurophyllidia was segregated from Z. skinneri by
Stevenson in 1993. Over the years it became apparent that plants
from Costa Rica and adjacent Panama that were routinely identified
as Z. skinneri were quite different from the original description
and illustrations of Z. skinneri in
Dietrich (1851) and
Interestingly, the diploid chromosome number of Z. neurophyllidia
is 18 whereas that of Z. skinneri is 22.
Zamia neurophyllidia is a smaller version of Z. skinneri and has smaller trunks, leaves, leaflets, pollen and seed cones, and seeds as compared to Z. skinneri. Z. neurophyllidia has leaves with 6-12 pairs of leaflets that are 12-20 cm long and 6-10 cm wide as opposed to Z. skinneri which has 4-8 pairs of leaflets that are 30-50 cm long and 12-15 cm wide. Plants of Z. neurophyllidia at the type locality and nearby have maintained this diminutive size, as adult reproductive plants for nearly thirty years. Thus, Z. neurophyllidia appears to be a distinct species related to Z. skinneri.
Distribution and habitat:
Zamia neurophyllidia occurs in Costa Rica and Panama where it grows as an understory plant at from 100-400 m in rainforest that may be occasionally flooded.
Zamia neuropyllidia is locally common in southern Costa Rica and
Eastern Panama in both pristine and disturbed habitats. Seed set appears
high and the populations are not, at this time, threatened by development
or destruction. Not listed in the
1997 IUCN Red List of Threatened Plants.
|Photo Cynthia Armstrong
|Photo Dennis Stevenson
Stem arborescent, to 60 cm tall, 6-12 cm diam.
Cataphylls triangular basally, linear-lanceolate apically, 3-6 cm long, 1-2 cm wide.
Leaves 3-10, 0.5-1 m long; petiole with numerous prickles, to 30 cm long; rachis with few prickles in lower third, with 6-10(12) pairs of leaflets.
Leaflets elliptic, grooved between the veins on the adaxial surface, cuneate basally, acuminate apically, margins serrulate in upper third, the larger median ones 12-20 cm long, 6-10 cm wide.
Pollen cones cream to tan, cylindrical to elongate-cylindrical, 5-8 cm long, 1-2 cm diam.
Seed cones brown, short pedunculate, ovoid cylindrical, 10-15 cm long, 3-4 cm diam.
Seeds red, ovoid, 1-1.5 cm diam.
2n = 18 (Caputo et al. Amer. J. Bot. 83: 1513-1520. 1996).