Desmoncus loretanus Henderson, Phytotaxa 35: 29 (2011)

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Perupresent (Henderson, A., A revision of Desmoncus (Arecaceae) in Phytotaxa 35. 2011)A
From 3°27'-5°12'S and 72°50'-73°58'W in Amazonian Peru (Loreto) at 112(90-130) m elevation in seasonally flooded tahuampa forest (Henderson, A., A revision of Desmoncus (Arecaceae) in Phytotaxa 35. 2011)A

Discussion

  • Taxonomic notes:-It differs from Desmoncus madrensis in its ribbed, scarcely tomentose, non-spiny peduncular bracts and from D. polyacanthos in its fruit surfaces with Y-shaped fibers. (Henderson, A., A revision of Desmoncus (Arecaceae) in Phytotaxa 35. 2011)A

Description

  • Plants height no data; stems 1.2(0.7-1.6) cm diameter. Leaf petioles 1.5(0.7-2.2) cm long; rachises 39.7(33.5-46.5) cm long, 4.2(3.3-5.7) mm wide, the spines usually <1 cm long, mostly abaxial, recurved with markedly swollen bases; pinnae 6(6-7) per side of rachis, without long, filiform apices, without a beard of spines at the bases, without spinules or dense tomentum at the bases adaxially; basal pinna 11.4(3.0-15.5) cm long, 2.6(1.0-3.5) cm wide; cirri well-developed, with acanthophylls, with spines abaxially mostly on proximal part only, with no intermediate acanthophylls present, with a wide gap between pinnae and acanthophylls(i.e., gap wider than that between adjacent acanthophylls). Inflorescences with the rachis angular, slightly twisted, thicker than the few to numerous, closely spaced and spirally arranged rachillae, each rachilla not (or very rarely) adnate to the rachis, subtended by an acute bracteole and with a welldeveloped axillary pulvinus; peduncles 2.1(1.0-2.6) mm wide; peduncular bracts 15.8(12.0-24.5) cm long, broad, ribbed with several more prominent, lighter colored ribs, brown, scarcely or not tomentose, without spines (rarely with a few spines); rachillae 9(6-12), glabrous or scarcely tomentose initially; proximal rachillae 4.5(2.5-6.5) cm long, 0.9(0.8-1.2) mm wide; stamens 7; fruits 13.0(10.5-15.9) mm long, 8.0(7.0- 9.6) mm wide, the surfaces uneven with numerous, subepidermal, short, often branching (Y-shaped) fibers; fruiting corollas less than one quarter as long as fruits, splitting irregularly into 3 lobes, the lobes often splitting again; endocarps narrowly ellipsoid with rounded apices, the pores lateral. (Henderson, A., A revision of Desmoncus (Arecaceae) in Phytotaxa 35. 2011)A

Bibliography

    A. Henderson, A., A revision of Desmoncus (Arecaceae) in Phytotaxa 35. 2011