Cochliostema

Cochliostema is a genus of plants with two species in the family Commelinaceae (the spiderwort and dayflower family). The genus occurs from southern Nicaragua to southern Ecuador.

Systematics

Cochliostema is a member of the subtribe Dichorisandrinae of the tribe Tradescantieae of the flowering plant family Commelinaceae. Its closest relative in the Dichorisandrinae is Plowmanianthus, followed by Geogenanthus. All three genera share the possession of flower petals fringed with moniliform trichomes. Within Cochliostema there are two species: Cochliostema velutinum R.W.Read and Cochliostema odoratissimum Lemaire. Cochliostema jacobianum, a 19th-century name thought to represent another species and still popular among horticulturists, is considered as part of the latter species.

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.

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.

Wikimedia Commons has media related to Cochliostema.

Cochliostema es un género de plantas con 2-3 especies perteneciente a la familia Commelinaceae. El género se distribuye desde el sur de Nicaragua hasta el sur de Ecuador.

Las dos especies son Cochliostema velutinum R.W.Read y Cochliostema odoratissimum Lemaire. Cochliostema jacobianum es considerada parte de esta última especie.

Características

Es una planta herbácea en forma de roseta sin ramas, con hojas casi suculentas. En condiciones naturales la planta es epifita; sin embargo, se han encontrado plantas terrestres sobre o alrededor de árboles caídos sugiriendo que estas plantas han crecido epifitas. La especie Cochliostema odoratissimum, es una epifita grande. Esta especie alcanza el mayor tamaño de este género, con unas hojas que llegan a medir 1 metro de longitud; algunas plantas alcanzan 2 metros de altura. En su hábito se asemeja a algunas bromelias.

Las flores crecen en grandes conjuntos, siendo los más grandes, fragantes y complejos de la familia. Consisten en 3 sépalos, 3 pétalos azules o azul violeta, 3 estambres fusionados por su filamentos en la parte superior de la flor y 3 carpelos fusionados.

Taxonomía

El género fue descrito por Charles Lemaire y publicado en L'illustration horticole 6: Misc. 70. 1859.^[1]​ La especie tipo es: Cochliostema odoratissimum Lem.

Especies aceptadas

A continuación se brinda un listado de las especies del género Cochliostema aceptadas hasta noviembre de 2013, ordenadas alfabéticamente. Para cada una se indica el nombre binomial seguido del autor, abreviado según las convenciones y usos.

• Cochliostema odoratissimum Lem.
• Cochliostema velutinum Read

Referencias

Kohliostema (lat. Cochliostema), manji biljni rod iz Srednje Amerike i sjeverozapada Južne Amerike (od Nikaragve do Ekvadora)^[1], kojemu pripada dvije vrste trajnica.

Rod pripada porodici komelinovki

Vrste

1. Cochliostema odoratissimum Lem.
2. Cochliostema velutinum Read

Izvori

Cochliostema é um género botânico pertencente à família Commelinaceae^[1].

Cochliostema là một chi thực vật có hoa trong họ Commelinaceae.^[1]

Chú thích

Liên kết ngoài

• Phương tiện liên quan tới Cochliostema tại Wikimedia Commons
• Dữ liệu liên quan tới Cochliostema tại Wikispecies

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