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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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Schultesia Mart.
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PlaceOfPublication
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Nov. Gen. Sp. P1. 2: 103. 1826.
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Description
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Herbs, erect, annuals, branched or unbranched; stems terete to angulate, oc- casionally with an inconspicuous wing. Leaves cauline, sessile, usually ovate to obovate, sometimes narrowly so, obtuse, acute to short-acuminate apically, usually amplexicaul at the base, chartaceous to submembranous. Inflorescences
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Habit
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Herbs
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Description
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terminal or axillary, few- to many-flowered or 1-flowered by reduction of a simple dichasium, simple or compound dichasia, bracteate. Flowers often large and showy, usually white, pink or lavender; calyx 4-parted, tubular, cupular or urceolate, 4-carinate to 4-winged, the lobes longer or shorter than the tube; corolla infundibular, ? constricted above the ovary, 4-lobed, the lobes usually ovate to triangular, contorted in aestivation; stamens usually 4, included to slightly exserted, the filaments filiform, basally dilated to form a membranous wing, the anthers oblong, erect, usually with an inconspicuous apical mucro; pistil included, ovary 1-locular, the placenta slightly to considerably intruded, the style filiform, deciduous, the stigma bilobate. Capsules septicidally 2-valvate, surrounded by the marcescent calyx and corolla; seeds small, numerous, foveolate. Pollen grains united in a usually tetrahedral tetrad, 44-77 microns; single grains 3-col- porate (3-colpate, 3-porate), the concurrent colpi of two contiguous grains ca. 15 X 13 JL, the ora usually not confluent, the colpus margin and adjacent areas of exine often patternless, the colpus membrane granulose, the diameter of apo- colpia 18-25 microns; exine 2-6 microns thick at the distal poles, decreasing in thickness towards equator; sexine thicker than nexine, reticulate, heterobrochate, the lumina 0.5-7 microns or 0.5-2 microns in diameter, the muri 0.5-1 microns wide; nexine smooth or granulose (S. guianensis, S. heterophylla, S. lisianthoides).
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Note
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The pollen of the genus Schultesia is similar to that of Coutoubea; S. guianensis has markedly stout and thick bacules; S. heterophylla has commonly rhomboidal tetrads; S. lisianthoides consistently differs from the other species, having on the average smaller tetrads and a finer reticulate pattern.
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Distribution
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A neotropical genus of annual herbs containing 20 to 25 species with 4 known from Panama.
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Key
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a. Calyx 1.2-4.6 cm long, conspicuously winged, the wing (1.5-)2-3 mm broad. b. Flowers 4-5.7 cm long; the calyx wing inconspicuously veined; the corolla lobes 1.3-2.1 cm long ...... 1. S. heterophylla bb. Flowers 1.6-2.6 cm long; the calyx wing with conspicuous dense-reticulate veins; the corolla lobes 0.6-0.8 cm long ...... 2. S. guianensis aa. Calyx 0.6-0.9 cm long, carinate, unwinged or very narrowly winged, the wing when present less than 1 mm broad. c. Inflorescences of few- to many-flowered simple or compound dichasia; leaves more crowded toward the base ...... 3. S. lisianthoides cc. Inflorescences 1-flowered by reduction of simple dichasia; leaves uniformly dis- tributed along the stem ...... 4. S. pohliana
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