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(Last Modified On 1/22/2013)
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(Last Modified On 1/22/2013)
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Genus
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POUROUMA Aubl.
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PlaceOfPublication
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Hist. P1. Guian. Fr. 2:891. 1775.
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Synonym
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Puruma St.-Hil. Expos. Fam. 2:313. 1805, var. orth.
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Description
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Dioecious trees, frequently epiphytic and strangling when juvenile, the branches usually stout and hollow. Leaves spiral, basifixed, entire to deeply lobed; stipules fully amplexicaul and leaving a scar completely surrounding the stem. Inflores- cences repeatedly cymose, the flowers rather indefinitely glomerate at the ends of the branches. Staminate flowers with 4 nearly free tepals and 4 free stamens. Pistillate flowers with a fleshy cupular or tubular perianth, epigynous; stigma obscurely 2-lobed. Fruit a somewhat fleshy false drupe of moderate size. Perhaps 30 or more species from southern Mexico to Bolivia and Brazil. In Panama and Costa Rica the trees are known locally as guarumo, a name applied to certain other quite unrelated plants with a milky or mucilaginous sap.
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Habit
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tree
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Note
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The species of Pourouma are perhaps the most ambiguous and vexatious of American Moraceae, a dubious distinction. The representation from Panama is extremely meagre and very little, if anything, is known of the variability of the species of the genus in any part of its range. The flowers apparently display little in the way of systematic variation. Consequently the species which follow are quite tentative.
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Key
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a. Leaves not deeply lobed, the median lobe divided about halfway or less to the petiole and scarcely constricted at the base (sometimes entire or subentire in P. radula). b. Pubescence spreading fulvous-tomentellous; leaves 3-lobed or some- times entire. 1. P. RADULA bb. Pubescence rubiginous-papillate, variously interspersed-hispid; leaves usually 5-lobed-. 2. P. JOHNSTONII aa. Leaves deeply lobed, the median lobe divided about two-thirds or more to the petiole, definitely constricted at the base. b. Pubescence (except the upper inflorescence) appressed-sericeous; leaves usually 3-lobed.- . 3. P. SCOBINA bb. Pubescence rubiginous-papillate, variously interspersed-hispid; leaves usually 7- to 9-lobed. 4. P. ORARIA
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