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(Last Modified On 9/25/2013)
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(Last Modified On 9/25/2013)
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Genus
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COLOGANIA Kunth
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Contributor
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W. G. D'Arcy
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PlaceOfPublication
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Mimoses 205. 1819.
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Note
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LECTOTYPE: C. angustifolia Kunth.
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Description
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Perennial herbs or vines; stems mostly slender, glabrate to pilose. Leaves 1- 3-pinnate trifoliolate, leaflets ovate, oblong, or linear, mucronulate, pellucid, sti- pels subulate; stipules narrow, somewhat striate. Inforescences axillary, short racemes or solitary flowers, sometimes aggregated as few flowered panicles, sometimes the flowers clustered to appear umbellate; bracts and bracteoles per- sistent, the bracteoles 2, inserted below the calyx and mostly much shorter than the calyx; pedicels evident. Flowers violet, showy; calyx tubular, the upper 2 teeth at least partly connate, the lowest tooth longest, somewhat gibbous basally;
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Habit
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herbs or vines
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Description
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standard elliptical, emarginate, erect, laterally reflexed, wings oblong, the claw obtuse, the keel much smaller than the wings; stamens diadelphous, the vexillary stamen free, the anthers alike or alternate ones slightly smaller; ovary linear, pubescent, many ovuled, stipitate, the style incurved, glabrous, the stigma glo- bose. Legume linear, compressed, elastically dehiscent by 2 valves, pilose; seeds numerous, compressed, lenticular or quadrate, the hilum oblong.
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Note
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Cologania is distinguished mainly by its tubular calyx.
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Distribution
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The genus is best developed in Mexico, but ranges southward to Argentina and north into the south- ern United States.
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Note
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It includes 6-10 species. A few species have been cultivated for ornament.
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Reference
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Rose, J. N. 1903. Synopsis of the species of Cologania. Contr. U.S. Natl. Herb. 8: 34-42
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Key
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a. Leaves trifoliolate, the leaflets ovate, chartaceous or membranaceous, the lateral venation ascending at about 45 ...... 1. C. biloba aa. Leaves unifoliolate (simple), the leaflets linear to narrowly ovate, subcoriaceous, the lateral venation strongly ascending ...... 2. C. procumbens
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