Geonoma montana Henderson, sp. nov. Type. PERU. Amazonas: Dist. El Cenepa, Región Nororiental de Marañon, Río Cenepa, comunidad Tutino, 4°33´S, 78°10´W, 750 m, 22 Nov 1993, R. Vasquez, C. Diaz, J. Mostacero, F. Mejia, & J. Ampam 18508 (holotype: NY!; isotype: MO).

Plant height 2.2(1.5-4.0) m, CV 0.3, n = 22; stems clustered; stem diameter 0.9(0.5-1.2) cm, CV 0.2, n = 24; internode length 2.0(0.7-6.0) cm, CV 0.7, n = 21; Leaf sheath length 9.2(6.5-13.5) cm, CV 0.3, n = 9; petiole and rachis without tomentum or with sparse, flat tomentum; petiole length 14.5(5.0-27.5) cm, CV 0.5, n = 14; rachis length 30.1(18.2-42.5) cm, CV 0.3, n = 17; rachis width 2.4(1.4-3.4) mm, CV 0.2, n = 20; number of leaf divisions per side of rachis 2(1-4), CV 0.4, n = 19; basal angle of pinna divergence 49(20-70)°, CV 0.3, n = 20; apical angle of pinna divergence 39(25-47)° CV 0.1, n = 21; apical pinna length 12.9(9.0-20.8) cm, CV 0.2, n = 19; veins on adaxial surface of pinnae not or scarcely raised. Inflorescences infrafoliar, rarely interfoliar, branched; prophyll length 4.8(3.5-6.0) cm, CV 0.4, n = 2; distance between bract scars 0.2(0.1-0.4) cm, CV 0.4, n = 21; peduncle length 3.2(2.0-5.4) cm, CV 0.3, n = 23; peduncle remaining straight; rachilla length 16.5(10.0-24.9) cm, CV 0.3, n = 22; rachilla width 4.1(2.2-5.4) mm, CV 0.2, n = 20; number of rachillae 3(2-4), CV 0.2, n = 24; flower pits tricussate, quadricussate, or a higher order; fruit diameter 6.1(5.4-6.7) mm, CV 0.1, n = 4; fruit color black or brown.

Distribution. From 4°29´-10°18´S and 74°47´-78°20´W at a mean elevation of 498 (170-950) m on eastern Andean foothills in Peru (map).

There is geographic discontinuity, and morphological variation in leaves, but too few specimens to test for differences amongst areas.