Cochliostema
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 Cochliostema odoratissima
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Cochliostema is a genus of plants with 2-3 species in the family Commelinaceae (the spiderwort and dayflower family). The genus occurs from southern Nicaragua to southern Ecuador.
[edit] Systematics
Cochliostema is a member of the subtribe Dichorisandrinae of the tribe Tradescantieae of the flowering plant family Commelinaceae. The two species are Cochliostema velutinum R.W.Read and Cochliostema odoratissimum Lemaire. Cochliostema jacobianum is considered as part of the latter species.
[edit] Morphology
Rosette, typically unbranched herbs with somewhat succulent, strap-shaped leaves. In the wild, plants grow as epiphytes; however, terrestrial plants are found on or around tree falls suggesting that these ground-dwelling plants had been growing epiphytically. One species, Cochliostema odoratissimum, is a tank-epiphyte, resembling certain bromeliads in this respect. This species also attains the greatest size for the genus, with its leaves reaching to 1 m in length, and plants sometimes reaching 2 m in height.
Flowers are borne in large thyrses and are generally the largest (ca. 2.5 cm diam.), among the most fragrant, and arguably the most complex in the spiderwort family. They consist of 3 sepals, 3 blue to blue-violet and fringed petals, 3 stamens fused by their filaments in the upper half of the flower, and 3 carpels fused into a single trilocular pistil. The fused staminal structure has 3 spirally coiled anthers enveloped and concealed by petaloid extensions of the filaments of the two lateral stamens contributing to the 3-staminate structure. These structures, termed "cuculli", are narrowed into two distal hose-like extensions.
[edit] References
- Hardy CR, DW Stevenson (2000) Development of the flower, gametophytes, and floral vasculature in Cochliostema odoratissimum (Commelinaceae). Botanical Journal of the Linnean Society 134 (1): 131-157.
- Hardy CR (2001) Systematics of Cochliostema, Geogenanthus, and an undescribed genus in the spiderwort family, Commelinaceae. Ph.D. Dissertation, Cornell University, Ithaca, NY, USA.
