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(Last Modified On 1/14/2013)
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(Last Modified On 1/14/2013)
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Genus
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ANTIGONON Endl.
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PlaceOfPublication
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Gen. P1. 310. 1836-40.
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Synonym
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Corculum (Endl.) Stuntz, in U. S. D. A., Bur. P1. Ind., Bull. 282:86. 1913.
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Description
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Flowers perfect, with articulated pedicels, in ochreolate fascicles of 1-many. Perianth of 5 discrete unequal tepals, the outer 3 broader than the inner 2; tepals red or greenish white, slightly accrescent in fruit. Stamens 8, 2-3 mm. long, at first exceeding the stigmata; filaments united below into an occasionally appen- diculate tube essentially free from the tepals; anthers 4-locular, introrse, versatile, about 0.5 mm. long. Ovary trigonous; styles 3, arcuate, terminated by peltate stigmata. Achenes mostly concealed by the tepals, bluntly 3-angled, usually brown and slightly lustrous. Capreolate vines scandent by tendrils terminating the inflores- cences, the stems sulcate, herbaceous or suffrutescent, pubescent or glabrate. Leaves alternate, cordate to deltoid, acute to acuminate apically, the blades exceeding the alate or terete petioles; ochreae obsolete. Inflorescences of axillary and terminal racemes or panicles, the rhachises usually pubescent and terminated by tendrils.
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Note
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This genus, indigenous to Mexico and Central America and cultivated elsewhere because of its handsome flowers and reputedly edible tubers, is here considered to consist of only three species. Due to the rapid migrations of cultivants, all three species are treated here, although A. leptopus is the only species so far collected in Panama. Stuntz (in U. S. D. A., Bur. P1. Ind., Bull. 282:86. 1913.), in his widely overlooked paper, points out the similarity of the name Antigonon with Antigoia, now reduced to synonomy with Casearia in the Flacourtiaceae. He concluded that Antigonon was homonymous with Antigona and proposed the generic name Cor- culum. International rules of nomenclature allow the existence of Peponia and Peponium so apparently different singular genders are not regarded as homonyms or orthographic variants. Consequently the generic name Antigonon should be maintained.
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Distribution
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This genus, indigenous to Mexico and Central America and cultivated elsewhere because of its handsome flowers and reputedly edible tubers, is here considered to consist of only three species.
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Key
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a. Outer tepals at anthesis longer than broad, cordate, minutely pubescent without, rarely stipitate-glandular within; petioles alate or terete, pubescent or glabrous, longer than the sinus of the cordate to truncate leaf base, mostly more than 1 cm. long. b. Tepals reddish, in fruit less than 1.5 times as long as broad; achene included; petioles terete or alate .------------------ 1. A. LEPTOPUS bb. Tepals greenish white, in fruit mostly more than 1.5 times as long as broad; achene slightly exserted; petioles alate .......... 2. A. FLAVESCENS aa. Outer tepals at anthesis at least as broad as long, rounded at both ends, closely tomentose without, stipitate-glandular within; petioles mostly terete, shorter than the sinus of the cordate leaf base, mostly less than 1 cm . long . . ........................... 3. A. GUATEMALENSE
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