Eschweilera juruensis R.Knuth
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Authority
Mori, S. A. & Prance, Ghillean T. 1990. Lecythidaceae - Part II: The zygomorphic-flowered New World genera (Couroupita, Corythophora, Bertholletia, Couratari, Eschweilera, & Lecythis). With a study of secondary xylem of Neotropical Lecythidaceae by Carl de Zeeuw. Fl. Neotrop. Monogr. 21: 1-376. (Published by NYBG Press)
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Family
Lecythidaceae
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Scientific Name
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Type
Brazil. Acre: Nr. mouth of Rio Macauhan (trib. Rio Yaco), 9°20'S, 69°W, 3 Sep 1933 (fl), Krukoff 5755 (holotype, B, not found; lectotype, NY, here designated; isolectotypes, BM, K, M, MO, NY, RB 2 sheets, U, US).
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Description
Description - Trees, to 30 m tall, sometimes buttressed. Leaf blades oblong, 12-28 x 6-13 cm, glabrous, coriaceous, with 16-24 pairs of lateral veins; apex short acuminate to acuminate; base obtuse to rounded; margins entire; petiole 15-21 mm long. Inflorescences terminal or axillary, racemose, usually unbranched, sometimes once-branched, the rachis angular, usually drying black, with distinct scars left by caducous bracts, to 15 cm long, the pedicel glabrous, 4-10 mm long. Flowers 45 cm diam.; calyx with six lobes, the lobes widely to very widely ovate, 9-13 x 7-11 mm, ascending, imbricate, convex to nearly flat abaxially, flat to slightly concave adaxially; petals six, widely obovate, 26-43 x 21-30 mm, yellow; hood of androecium 25 x 20-27 mm, forming double coil, yellow; staminal ring with ca. 500 stamens, the filaments clavate, slightly curved, 3-3.5 mm long, the anthers 0.7 mm long; hypanthium tapered to articulation of pedicel, not truncate; ovary 2-locular, each locule with 6-8 basally attached ovules, the style obconical, not well differentiated from summit, 3.5 mm long. Fruits depressed globose, truncate at calycine ring, the supracalycine zone erect, 3-6 x 5-8 cm (excluding operculum), the pericarp 2-4 mm thick, the exocarp rough, light brown, the operculum nearly flat to slightly convex. Seeds triangular in cross section, 3.5 x 3.5-4 cm, with lateral aril.
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Discussion
The attenuated bases of the ovary, yellow vs. white petals, and tendency toward smaller leaves are the only features distinguishing this species from the sympatric E. gigantea.
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Common Names
Machimango, shuát, Matamatá, matamata Castanha
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Distribution
A canopy tree of western Amazonia which has been collected in both periodically flooded and non-flooded forests. It blooms from Sep to Mar.
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