Geonoma lehmannii subsp. corrugata Henderson, 2011

Henderson, Andrew, 2011, A revision of Geonoma (Arecaceae), Phytotaxa 17, pp. 1-271 : 87-88

32b. Geonoma lehmannii subsp. corrugata Henderson , subsp. nov. (Appendix IV, Plate 39)

Geonomae lehmannii subsp. lehmannii pedunculis longioribus differt.

Type: PANAMA. Chiriquí: Cerro Pate de Macho, 8°49’N, 82°24’W, 2150 m, 31 December 1985, G. de Nevers & S. Charnley 6684 (holotype NY!, isotype MO!).

Leaves plicate. Inflorescences prophylls 30.8(16.5–41.5) cm long; peduncles 62.9(19.0–88.5) cm long.

Distribution and habitat:— From 8°29’– 8°52’N and 81°05’– 82°35’W in western Panama at 1715(1100–2500) m elevation in montane rainforest ( Fig. 22 ). The outlying specimens are likely to be an artifact of insufficient collecting.

There is geographical variation in this subspecies (unlike subsp. lehmannii ). Regression shows there are significant positive associations between elevation and one plant, five leaf and two inflorescence variables. Squared multiple R for the regression of stem height on elevation is 0.38, rachis width 0.19, number of pinnae 0.22, basal pinna length 0.38, basal pinna angle 0.29, apical pinna angle 0.34, peduncular bract length 0.67, and peduncle length 0.43. Values of all these variables increase with increasing elevation. Plants at higher elevations have taller stems, leaves with more pinnae and wider angles, and longer inflorescences. de Nevers and Grayum (1998) considered that there were two morphotypes of this taxon (as G. jussieuana ); one with deciduous leaf bases and narrow, undivided leaves occurring in tall forest at lower elevations, and the other with persistent leaf bases and pinnate leaves occurring on wind-swept ridges in low forest at higher elevations.

Figures

FIGURE 22. Distribution maps of Geonoma lanata, G. laxiflora, G. lehmannii subsp. lehmannii, and G. lehmannii subsp. corrugata.