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(Last Modified On 8/12/2013)
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(Last Modified On 8/12/2013)
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Genus
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Esenbeckia H.B.K.
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PlaceOfPublication
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Nov. Gen. Sp. P1. 7: 246. 1825.
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Note
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TYPE: E. pilocarpoides H.B.K.
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Synonym
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Polembryum A. Juss., Mem. Mus. Paris 12: 519. 1825.
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Description
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Small to medium sized resinous trees or shrubs with thin, light colored bark separating in flat, irregular plates. Leaves alternate, pseudopposite to rarely opposite, simple, or 1-5 foliolate, the leaflets variable, chartaceous to sub- coriaceous, pellucid-punctate, petiolate, glabrous to variously pubescent. Inflo- rescences terminal or upper axillary, paniculate, few to many flowered, often subglomerate, pedunculate. Flowers small, greenish white, bisexual, (4-) 5- merous, regular; calyx cupular, the lobes ovate, obtuse at the apex, imbricate in bud; stamens 5, free, all fertile, inserted at the base of the nectary, the filaments filiform, the anthers tiny, subcordate at the base; ovary globose, depressed on the top, 5-lobed, frequently covered with numerous tubercules, 5-locular, ovules 2 per locule, superimposed, the style filiform, the stigma 1 or 5 lobed. Capsules dry, capsular, subglobose to obovoid, composed of 5 carpids, each carpid with a small to conspicuous hornlike projection; seeds oblong to reniform, 1-2 per locule, the testa smooth to rugose.
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Habit
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trees or shrubs
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Distribution
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Esenbeckia is a New World genus of perhaps 20 species extending from Texas and Mexico throughout Middle America to central South America. Three species are known from Panama.
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Key
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a. Leaves trifoliolate, alternate. b. Trees 10-20 m tall; petioles 5.5-8.5 cm long; leaflets 10.0-20.5 cm long; capsules urceolate, each segment conspicuously beaked ...... 1. E. alata bb. Shrubs to 5 m tall; petioles 1.0-3.5 cm long; leaflets 5-12 cm long; capsules sub- globose, the segments not beaked ...... 2. E. litoralis aa. Leaves simple, opposite or ternate ...... 3. E. panamensis
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