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Project Name Data (Last Modified On 4/10/2013)
 

Flora Data (Last Modified On 4/10/2013)
Genus Prestonia R. Br.
PlaceOfPublication Mem. Wern. Nat. Hist. Soc. 1: 69. 1811.
Description Lianas, suffruticose to slightly herbaceous, lacticiferous. Leaves opposite, non- glandular, pinnately-nerved; petioles somewhat perfoliate, mostly glandular in the axils. Inflorescences ? corymbose, racemose, or umbellate, mostly axillary, rarely subterminal. Flowers mostly medium-sized to large; calyx 5-lobed, the lobes equal to subequal, bearing 1 or rarely several squamellae within; corolla salverform to subinfundibuliform, with or rarely without 5-epistaminal append- ages, the orifice with a thickened annulus, the tube straight or gibbous, the limb 5-lobed, dextrorsely convolute; stamens 5, included or half exserted, the anthers connivent and agglutinated to the stigma, with an enlarged connective; gynoeci- um 2-carpellate, apocarpous, the ovary superior, the ovules many, the nectaries 5, separate or concrescent, thin or fleshy, the style 1, the stigma fusiform or sub- capitate, sometimes weakly umbraculiform below. Fruit ? apocarpous, sometimes connate apically or ? agglutinated, of (1-)2 follicles; seeds many, dry, comose apically.
Habit Lianas
Distribution A large genus of about 60 species mostly in northern South America, but found also in Mexico, Central America, the West Indies, and as far south as Argentina.
Reference Woodson, R. E., Jr. Prestonia. Pp. 276-367 in "The American genera of Echitoideae." Ann. Missouri Bot. Gard. 23: 169-438. 1936.
Key a. Calyx-lobes small and inconspicuous, ca. 1.5-2 mm long, ? reflexed.... 1. P. acutifolia aa. Calyx-lobes large and conspicuous, ca. 4-25 mm long, ? erect. b. Corolla glabrous or only papillate externally. c. Nectaries separate, or connate only basally; calyx-lobes cc. Nectaries concrescent; calyx lobes mostly > 10 mm long. d. Nectaries thick and fleshy throughout, shorter than the ovary ........... 3. P. obovata cc. Nectaries thin and ? diaphanous, at least on the margins, surpassing the ovary at anthesis ............................. 4. P. portobellensis bb. Corolla densely pubescent externally at least on the lobes. e. Corolla-tube with elongate epistaminal appendages within; calyx-lobes 9-11 mm long ..................................... 5. P. ipomaeifolia ee. Corolla-tube without elongate epistaminal appendages within; calyx-lobes mostly > 11 mm long. f. Each calyx-lobe with a single deltoid squamella. g. Annulus distinctly 5-lobed .......... ................. 6. P. allenii gg. Annulus ridged and uneven, but not distinctly 5-lobed .... 7. P. wedelii ff. Each calyx-lobe bearing several thin calycine squamellae ... 8. P. remediorum
 
 
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