Eperua jenmanii Oliv. subsp. jenmanii, Oliv.

Fortes, Elenice A., Dos, Ilka P., Steege, Hans Ter, Aymard, Gerardo, Secco, Ricardo De S., Martins-Da-Silva, Regina Célia V. & Mansano, Vidal F., 2023, A taxonomic revision of the genus Eperua (Leguminosae, Detarioideae, Detarieae), Phytotaxa 617 (1), pp. 1-127 : 67-68

10a. Eperua jenmanii Oliv. subsp. jenmanii

Inflorescences puberulent; bracts and bracteoles puberulent externally, glabrous within, trichomes white; pedicel puberulent, sometimes puberulent to glabrescent, trichomes white; buds puberulous, trichomes white. Flowers: hypanthium puberulent, sometimes puberulent to glabrescent; stamens sheath shorter side 9.1–15.0(–23.0) mm long, longer side 10.3–26.0 mm long.

Phenology:— Flowering in May and from July to December; fruiting in February, March, September, and November.

Distribution:— Esequibo River basin in Guyana (mainly Mazaruni River and lower Esequibo River region) and there are two collections in Venezuela bordering Guyana in Cuyuni River and El Dorado road. It is cultivated in Trinidad and Tobago.

Habitat:— Mainly floodplains (riverine) forests, sometimes in dry evergreen forest (wallaba forest), on alluvial, laterite, red sand, mixed brown and white sand soils, at sea level to 550 m elev.

Occurrence in protected areas:— Unknown.

Etymology:— The specific epithet is a tribute to G.S. Jenamn, who was the superintendent of the botanical gardens and government botanist at Georgetown in Guyana during 1879–1902 ( Stafleu & Cowan 1979), and collected the type specimen.

Vernacular names:— fine leaf walaba (Hoffman B. & Roberts L. 2502), ituri wallaba (Tutin T.G. 459), mahomillo (Steyermark J.A. 86665), water wallaba (Redden K.M. et al. 3213, Henkel T.W. & Chin M. 478).

Uses:— Guyana: used for firewood and roof shingles (Tutin T.G. 459).

Taxonomic notes:— The two E. jenmanii subspecies, namely jenmanii and sandwithii, can be differentiated from other species with 3-to 5-jugate leaves and non-falcate leaflets by their secondary venation with two intramarginal veins and vein closer to the margin continuous. The two subspecies have the largest petals in the genus. Among the species with tubular corolla, E. jenmanii distinguishes by its persistent bracts (vs. caducous in E. bijuga , E. glabriflora , E. banaensis , E.obtusata , and E. oleifera ), bracteoles attached to the lower portion of the pedicels (vs. at the base of the hypanthium or to the higher portion of the pedicels in E. grandiflora and E. oleifera , or the middle one in E. purpurea ), villous to glabrescent sheath (vs. glabrous in E banaensis and E. obtusata , puberulous in E. bijuga , puberulous to pubescent in E. glabriflora , and in E. grandiflora subsp. guyanensis , tomentose in E. manausensis ), and glabrous ovary (vs. sericeous in E. banaensis , E. grandiflora subsp. grandiflora , and E. obtusata ).

Specimens examined:— GUYANA. Cuyuni-Mazaruni, Kamakusa , Mazaruni River , 0.59 miles SE of base camp, 105 m elev., 5°55’0”N 59°52’59”W, 30 September 2004, Redden K.M. et al. 3213 ( U, US). Pakaraima Mts., SW-side of Kamarang , 450 m elev., 5°52’0”N 60°38’0”W, 09 November 1979, Maas P.J.M. & Westra L.Y.T. 3981 ( U, US). Demerara-Mahaica, Ramsaroop Farm-resort 2 km E of Timehri Airport, vicinity of main house, 5–15 m elev., 6°30’0”N 58°15’0”W, 25 January 1992, Hoffman B. & Capellaro C. 844 ( INPA, US ). Essequibo Islands-West Demerara, Groete River 2–4 km either side of mouth of Black Creek, 8–16 m elev., 6°37’0”N 58°36’0”W, 23 August 1993, Henkel T.W. & Williams R. 2715 ( U, US). Pomeroon-Supenaam, Takutu concession of Willems Timber Comp , 0–100 m elev., 7°0’0”N 58°49’59”W, 12 November 1991, Polak A.M. et al. 520 ( U). GUYANA. Potaro-Siparuni, Garraway Stream , 102.5 miles on Bartica-Potaro road, 38 m elev., 5°22’25.2”N 59°7’20.6”W, 12 March 2004, Redden K.M. et al. 2202 ( US). Upper Demerara-Berbice, Rockstone , 15 July–1 August 1921, Gleason H.A. 837 ( US). Unknown city, Essequibo River from Monkey Jump to Persaud timber concession, 5 m elev., 6°19’60”N 58°33’0”W, 22 May 1993, Henkel T.W. & Williams R. 2128 ( US). TRINIDAD AND TOBAGO (cultivated). Trindade, s.c. 1350 ( US). VENEZUELA. Bolívar, Río Venamo, between río Cuyuni (Anacoco) and Cano Apanao, 18 July 1983, Stergios B. et al. 6152 ( US); along road S of El dorado between km 42 and 65 , 229 m elev., 26 July 1960, Steyermark J.A. 86665 ( S, US).