A revision of Coccothrinax, Hemithrinax, Leucothrinax, Thrinax, and Zombia (Arecaceae) Author Henderson, Andrew text Phytotaxa 2023 2023-09-19 614 1 1 115 http://dx.doi.org/10.11646/phytotaxa.614.1.1 journal article 10.11646/phytotaxa.614.1.1 1179-3163 8389307 1.10. Coccothrinax concolor Burret (1929: 13) . Lectotype (designated here):— HAITI . Massif de la Selle , Jacmel, propre Etang-Bossier, ca. 150 m , 25 April 1926 , E . Ekman 5958 ( lectotype S n.v. , S image!, isolectotypes BH !, EHH n.v ., EHH image!, US!, the holotype at B was destroyed) Stems not recorded. Leaves not recorded; leaf sheath fibers not recorded; petioles 5.4 mm diameter just below the apex; palmans length not recorded, relatively short, with the adaxial veins prominent and terminating in a slight raised ridge and distinct pulvinus; leaf blades not wedge-shaped; segments number not recorded, the middle ones 29.5 cm long and 1.5 cm wide; segments not pendulous at the apices, giving the leaf a flat appearance; middle leaf segments relatively long and narrow, tapering from base to apex, scarcely folded, flexible and not leathery, a shoulder or constriction absent or poorly developed, the apices thin, deeply splitting and breaking off; middle leaf segment apices attenuate; leaf segments without indumentum, scales, or wax abaxially, without or with poorly developed transverse veinlets. Inflorescences curving, arching, or pendulous amongst the leaves, with few partial inflorescences; rachis bracts narrow, closely sheathing, sparsely tomentose, usually without hairs at the apex; partial inflorescences 4; proximalmost rachillae straight, 6.6 cm long and 0.5 mm diameter in fruit; rachillae uneven at or near anthesis with lines of warty outgrowths, these often becoming more pronounced as fruits develop; stamens not recorded; fruit pedicels 0.4 mm long; fruits 6.1 mm long and 6.6 mm diameter, color not recorded; fruit surfaces smooth or sometimes with projecting fibers; seed surfaces deeply lobed, the lobes running from base of seeds almost to apices. Distribution and habitat:— Southern Haiti ( Department Sud-Est ) ( Fig. 11 ) in forest at 150 m elevation. Taxonomic notes:— As a preliminary species, Coccothrinax concolor has a unique combination of qualitative character states and is recognized as a phylogenetic species. It is known only from the type specimen and may be extinct in the wild ( Fernández & Gottschalk 2017 ). It is a member of a group of nine Hispaniolan species (see notes under C. boschiana ), appearing most similar to C. gracilis but differing from that species in its absence of indumentum abaxially. It has an unusually elongate inflorescence and, for the group, large fruits.