Geonoma undata subsp. appuniana (Spruce) Henderson, 2011
Henderson, Andrew, 2011, A revision of Geonoma (Arecaceae), Phytotaxa 17, pp. 1-271 : 158
publication ID |
https://doi.org/ 10.11646/phytotaxa.17.1 |
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https://doi.org/10.5281/zenodo.5609204 |
persistent identifier |
https://treatment.plazi.org/id/FA4887FA-2483-BDDA-FF37-DCF71E53A647 |
treatment provided by |
Plazi |
scientific name |
Geonoma undata subsp. appuniana (Spruce) Henderson |
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67b. Geonoma undata subsp. appuniana (Spruce) Henderson View in CoL , comb. & stat. nov
Basionym: Geonoma appuniana Spruce (1871: 106) View in CoL . Type: GUYANA. Cuyuni-Mazaruni: Mount Roraima, 1864, C. Appun 1141 (holotype K!).
Geonoma roraimae Dammer (1915: 261) View in CoL . Type: GUYANA. Cuyuni-Mazaruni: Mount Roraima, 1800–2300 m, February 1910, E. Ule 8805 (holotype B, destroyed, isotypes K!, L!, US!).
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.
Distribution and habitat:— 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 ( Fig. 42 View FIGURE 42 ).
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.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Geonoma undata subsp. appuniana (Spruce) Henderson
Henderson, Andrew 2011 |
Geonoma roraimae
Dammer, U. 1915: 261 |