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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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Chelonanthus Gilg
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PlaceOfPublication
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Engl. & Prantl, Nat. PRl 4(2): Abt. 2: 98. 1895.
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Description
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Herbs, mostly annuals, rarely suffrutescent; the stems usually simple, erect, tetragonal and often slightly winged. Leaves sessile to sbort-petiolate, amlplexi- eaul; the lamina generally ovate, acute to acuminate at the base, membra- nous to subcoriaeeous, the costa prominent. Inflorescences of terminal or axillary, simple or compound dichasia, pedunculate. Flowers 5-mlerous, white, green- ish, yellow, rose or bluish, slightly zygomorphic, bracteate; calyx cupuliform to campanulate, the lobes imbricate, carinate; corolla infundibular, the tube gibbous, the lobes erect to slightly flaring; stamens 5, included to shortly ex- serted, the filaments adnate to the lower half of the corolla tube, the anthers usually reflexed, sagittate at base; ovary 2-locular (1-locular with much intrud- ing placentae), sessile, the style filiform, persistent, the stigma bilobate. Cap- sules surrounded by the marcescent calyx and corolla, generally ovoid, septi- cidally 2-valvate; seeds tiny, variously angulate, the testa often reticulate. Pollen grains united in tetrahedral tetrads, 52-77 /i; single grains 3-colporate (3-colpate, 3-porate), the concurrent colpi of two contiguous grains ca. 15 X 5 au, the diameter of apocolpia 25-30 /,; exine 2-4 Mu thick at the distal poles, 6-10 M at equator; sexine thicker than nexine, reticulate, heterobrochate, differentiated into a coarsely reticulate, ? equatorial zone with lumina 0.5-9 Mi in diameter, the muri 1-5 M wide, unevenly thickened, occasionally fragmented into ? rounded processes, and for the rest a more delicate reticulum with lumina 0.5-2 - in diameter, the muri 0.5-1.5 Mi wide, occasionally not connected laterally, of a pilum or clava-like shape; nexine smooth or granular (C. alatus).
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Herbs
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