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Inflorescences peduncular bracts 30.5(22.0–38.0) cm long; rachillae 23(18–27); fruits 17.3(15.6–19.3) mm<br />
long.<br />
Distribution and habitat:—From 0°02’N–7°45’S and 72°45’–76°26’W in the western Amazon region in<br />
Colombia, Ecuador, and Brazil (Acre) at 267(200–300) m elevation along river or lake margins in black or<br />
white water areas (Fig. 6).<br />
Taxonomic notes:—A specimen (Bernal 2033) from Colombia (Putumayo), not included in the above<br />
description, has narrow, lanceolate pinnae and a densely spiny peduncular bract (like D. polyacanthos), and<br />
fruits with Y-shaped fibers. It is sympatric with subsp. occidentalis and D. polyacanthos, and may be a hybrid.<br />
FIGURE 6. Distribution maps of Desmoncus horridus subsp. horridus, D. horridus subsp. apureanus, D. horridus<br />
subsp. occidentalis, and D. horridus subsp. palustris.<br />
5.4. Desmoncus horridus subsp. palustris (Trail) Henderson, comb. & stat. nov.<br />
Basionym: Desmoncus palustris Trail (1876: 353). Atitara palustris (Trail) Kuntze (1891: 727). Type:—BRAZIL.<br />
Amazonas: Rio Padauiri, 28 June 1874, J. Trail 1087/LXXXI (holotype K!, isotype BM!).<br />
Inflorescences peduncular bracts 24.1(14.5–32.5) cm long; rachillae 11(7–17); fruits 18.1(15.7–21.1) mm<br />
long.<br />
Distribution and habitat:—From 2°19’N–0°25’S and 62°55’–68°25’W in Colombia (Guainía), Brazil<br />
(Amazonas), and Venezuela (Amazonas) at 107(80–140) m elevation, along margins of the upper Rio Negro<br />
and its blackwater tributaries, growing in water at least part of the year (Fig. 6).<br />
A REVISION OF DESMONCUS (ARECACEAE)<br />
Phytotaxa 35 © 2011 <strong>Magnolia</strong> <strong>Press</strong> 25
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