Geonoma undata subsp. appuniana (Spruce) A.J.Hend., Phytotaxa 17: 158 (2011)

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Brazil Northpresent (World Checklist of Arecaceae)B
Guyanapresent (World Checklist of Arecaceae)B
Venezuelapresent (World Checklist of Arecaceae)B
From 0°46-6°04'N and 59°50-66°04'W in the Guayana Highland region of Venezuela, Brazil, and Guyana at 1752(810-2700) m elevation in montane rainforest. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Discussion

  • There is geographic discontinuity and specimens occur on many, isolated mountains, but there are too few specimens from each mountain to test for differences amongst them.
    There is geographical variation in this subspecies. Linear regression shows there are significant associations between elevation and three leaf and four inflorescence variables. Squared multiple R for the regression of rachis width on elevation is 0.40, basal pinna angle 0.29, apical pinna angle 0.58, prophyll length 0.23, rachilla width 0.23, fruit length 0.49, and fruit diameter 0.45. The rachis becomes thicker, pinna angles narrower, prophylls longer, rachillae thicker, and fruits longer and wider with increasing elevation. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Description

  • Leaves veins raised and rectangular in cross-section adaxially; basal pinna 3.8(0.5-27.0) cm wide; apical pinna 6.4(1.5-15.0) cm wide.
    Inflorescences prophyll margins with irregular, spine-like projections; flower pits usually spirally arranged, not distantly spaced. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A