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(Last Modified On 5/29/2013)
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(Last Modified On 5/29/2013)
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Genus
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Halenia Borckh.
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PlaceOfPublication
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Ark. Bot. 1: 25. 1796.
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Description
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Herbs, annual, biennial or perennial. Leaves sessile or petiolate, usually 3-5-veined, membranous to fleshy. Inflorescence terminal or axillary, subum- bellate, rarely a raceme or spicate cyme. Flowers with the calyx 4-parted, foli- aceous, the lobes linear, narrowly ovate, ovate or spathulate, usually papillate and bearing a small squamella at the base; corolla 4-parted, white, yellow, green or purple, campanulate, marcescent, the lobes dextrorsely convolute, elliptic to ovate, obtuse to acute, occasionally apiculate, entire to erose, often auriculate and papillate, prolonged at the base into usually short, retrorse spurs; stamens 4, included, adnate to the corolla tube, the filaments linear or ? dilated, the anthers ovate, oblong, or subtriangular, versatile; pistil included, the ovary sessile, the stigma bilobate. Fruit a compressed capsule, narrowly ovate to ovate, often subfalcate, septicidally dehiscent, surrounded by the marcescent calyx and corolla; seeds globose or ? flattened, brown to greenish tan, the testa granular or reticulate. Pollen grains in monads, radially symmetrical, isopolar, subprolate to prolate, the amb ? triangular, 40 X 28 microns, 3-colporate, the colpi relatively long with tapering ? acute ends, the colpus membrane smooth, ora rounded, relatively small, diameter of apocolpia 10 microns; exine 2 micons thick; sexine as thick as nexine, smooth or OL-pattern (H. woodsoniana).
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Habit
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Herbs
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Distribution
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A genus of ca. 70 species extending from Labrador and Newfoundland south- ward to South America. Three species are known from Panama.
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Reference
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Allen, C. K. A monograph of the American species of the genus Halenia. Ann. Missouri Bot. Gard. 20: 119-222, 7 fig., pl. 8-12. 1933.
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Key
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a. Cauline leaves elliptic to ovate-elliptic, conspicuously apiculate; spur of the corolla more than 1/2 as long as the corolla ...... 1. H. euryphylla aa. Cauline leaves linear-ovate to narrowly ovate, apically acute; spur of the corolla less than 1/2 as long as the corolla. b. Leaves basal and cauline, the basal leaves often in a dense rosette; stems to 20 cm tall; inflorescences ? compact, flowers often congested ...... 2. H. rhyacophila bb. Leaves cauline, more or less crowded near the base, no basal rosette; stems to 70 cm tall; inflorescences spreading, loose...... 3. H. woodsoniana
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