Eperua duckeana Cowan

Eperua duckeana Cowan

Arbor parva ad mediocris 7–25 m alta, trunco 20–30 diametro, ramulis glabris et nitidis; stipulae plerumque deciduae foliaceae glabrae, 9–15 mm longae, 9–10 mm latae, inaequilateraliter ovales ad ovatae; petioli 10–35 mm longi, glabri, rhachibus (8−)11–20 cm longis, glabris; foliola plerumque 4-jugata, petiolulis 4–8 mm longis, plerumque glabris, laminis aliquando plus minusve pellucido punctatis, coriaceis, planis, 6.5–10 (−12) cm longis, 3–6 cm latis, plerumque uno vel duo jugis basalibus ovatis ad lanceolatis et rotundato-obtusis, reliquis jugis ellipticis et basi subobtusis ad acutis, acuminatis ad longo-acuminatis mucronulatisque, glabris aut raro micropuberulis ad basem supra, plus minusve nitidis supra, venis venulisque prominulis; inflorescentiae plerumque terminales composito-racemosae, aliquando solum racemosae, 3–8 cm longae, axe tomentuloso, pilis arcuatis bifidis, bracteis bracteolisque caducis; pedicelli 820 mm longi, tomentulosi, hypanthio 3–4 mm longi, tomentulosi, hypanthio 3–4 mm longo, 4–6 mm diametro, tomentuloso, nectariis super labrum hypanthii procurrentibus; sepala diluto-viridia, tomentulosa extus, intus glabra, oblonga ad ovalia ad elliptica, 12–18 mm longa, 4–9 mm lata, uno dorsuali latiore et concavo, plerumque sepalis externis duobus glandulo versum apicem ornatis; petalum album, glabrum aut raro leviter puberu lum basaliter, 14–25 mm longum, 22–35 mm latum, oblatum, truncatum ad basem, petalodiis 1–2 mm longis; omnia stamina fertilia, filamentis 26–62 mm longis, 9 tubo basaliter conjugentibus, tubo plus minusve zygomorpho, 3.5–9 mm longo, tomentuloso et glabro virgato, antheris oblongis ca. 3.8 mm longis et 1.5 mm latis, glabris; stigma capitellatum, stylo 26 mm longo, glabro, ovario oblanceolato vel oblongo-oblanceolato, 7–8 mm longo, 33.5 mm lato, dense tomentuloso, gynophoro 6–10 mm longo, tomentuloso; fructus tomentulosus, 16 cm longus et 6 cm latus (submaturus), oblanceolatus, planus, carpophoro ca. 20 mm longo, tomentuloso.

TYPE COLLECTION.—A. Ducke 732 (holotype US sheet 1875576, isotypes F, NY, R) Rio Urubú below Iracema Falls, Amazonas, Brazil, 7 July 1941.

DISTRIBUTION.—Primary forest on sandy or clay soil, especially along rivers, but above the annual flood levels, in the vicinity of Manaus. Flowering June to September; fruiting May to December.

BRAZIL. Amazonas, vicinity of Manaus: Reserva Florestal Ducke, 20 Sept 1968, Aluisio 172 (INPA, US); edge of Riacho Grande, 15 Nov 1956, Coelho 4308 (US), 15 Nov 1956, Dionisio (INPA no.) 4308 (IAN); upper Mindú R., 19 Nov 1935, Ducke 244 (NY); Estrada do Aleixo, 25 Aug 1931, Ducke 23134 (G, P, RB, U, US); Rio Tarumã, 9 Aug 1949, Froes 24949 (IAN); Rio Urubú, 20 Oct 1949, Froes 23330 (IAN); Estrada BR-17, km 3, 13 June 1956, Melo & Coelho 3913 (US); Kms 60–70 Manaus-Itacoatiára, 21 Oct 1963, Oliveira 2737 (IAN); Estrada AM-1, km 70, 13 May 1969, Osmarino s.n. (INPA, US); Manaus to Caracarai Road, km 26, 10 Nov 1966, Prance et al 3072 (F, GH, NY, R, U, US); Rio Urubú between Iracema Falls and Natal, Caracarai Road, 5 June 1968, Prance et al 4977 (F, G, GH, M, NY, R, U, US); Estrada Manaus-Itacoatiara, km 202, 19 Dec 1966, Prance et al 3720 (NY), km 69, 8 Sept 1960, Rodrigues & Chagas 1725 (US), 5 Oct 1960, Rodrigues et al 1807 (US), km 65, Reserva Walter Egler, 4 Feb 1970, Rodrigues 8686 (INPA, US), km 55, 18 March 1961, Rodrigues & Lima 2233 (INPA, US); Reserva Florestal Ducke, 1 Dec 1964, Rodrigues & Osmarino 6769 (INPA, US); Igarapé do Riacho Grande, 14 Aug 1957, William 501 (IAN).