Desmoncus horridus subsp. palustris (Trail) Henderson, Phytotaxa 35: 25 (2011)

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Distribution

Map uses TDWG level 3 distributions (https://github.com/tdwg/wgsrpd)
Brazil North present (Henderson, A. 2011: A revision of Desmoncus (Arecaceae). – Phytotaxa 35: 1-88)A
Colombia present (Henderson, A. 2011: A revision of Desmoncus (Arecaceae). – Phytotaxa 35: 1-88)A
Venezuela present (Henderson, A. 2011: A revision of Desmoncus (Arecaceae). – Phytotaxa 35: 1-88)A
From 2°19'N-0°25'S and 62°55'-68°25'W in Colombia (Guainía), Brazil (Amazonas), and Venezuela (Amazonas) at 107(80-140) m elevation, along margins of the upper Rio Negro and its blackwater tributaries, growing in water at least part of the year. (Henderson, A. 2011: A revision of Desmoncus (Arecaceae). – Phytotaxa 35: 1-88)A

Discussion

  • Subspecific variation:-Rachis spines are less developed in subsp. palustris than in other subspecies, and in some cases are abaxial and appear short and recurved, almost like those of Desmoncus polyacanthos. See also notes under D. interjectus. Although Desmoncus riparius is an older name than Desmoncus palustris, its type specimen ((Desmoncus riparius Spruce (1869: 156). Atitara riparia (Spruce) Kuntz (1891: 727). Type:-VENEZUELA. Amazonas: Río Negro, San Carlos de Río Negro, October 1854, R. Spruce 46 (holotype K!)) may be of hybrid origin. A group of specimens (Clark 7982, Liesner 8940, Spruce 46, type of D. riparius) from Venezuela (Amazonas), not included in the above description, appear intermediate between subsp. palustris and D. polyacanthos, both of which occur in this area. These intermediates resemble D. polyacanthos but have scarcely spiny peduncular bracts and fruit surfaces with Y-shaped fibers. Another specimen (Liesner 6274) is from the same locality but much smaller and with a non-spiny sheath. (Henderson, A. 2011: A revision of Desmoncus (Arecaceae). – Phytotaxa 35: 1-88)A

Description

  • Inflorescences peduncular bracts 24.1(14.5-32.5) cm long; rachillae 11(7-17); fruits 18.1(15.7-21.1) mm long. (Henderson, A. 2011: A revision of Desmoncus (Arecaceae). – Phytotaxa 35: 1-88)A

Bibliography

    A. Henderson, A. 2011: A revision of Desmoncus (Arecaceae). – Phytotaxa 35: 1-88