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Epidendrum radicans
''Epidendrum radicans'' is a species of orchid. Common names include ground-rooting epidendrum, fire-star orchid, rainbow orchid, and reed-stem epidendrum.〔(''Epidendrum radicans''. ) Royal Botanic Gardens, Kew.〕 It is a common roadside weed at middle elevations in Central America. It is a crucifix orchid, often confused with many other members of the section ''Schistochila'', including ''E. calanthe'', ''E. cinnabarinum'', ''E. denticulatum'', ''E. erectum'', ''E. fulgens'', ''E. ibaguense'', ''E. imatophyllum'', ''E. incisum'', ''E. schomburgkii'', ''E. secundum'', and ''E. xanthinum'', among others. The diagnostic characteristic of ''E. radicans'' is its tendency to sprout roots all along the length of the stem; other crucifix orchids only produce roots near the base.〔Dressler, R. L.: "Will the Real ''Epidendrum ibaguense'' please stand up?" ''American Orchid Society Bulletin'', 58(1989) pages 796 - 800.〕 Additionally, ''E. radicans'' flowers are resupinate, unlike the members of the ''Epidendrum secundum'' complex, ''E. fulgens'', and many other crucifix orchids. ''E. radicans'' also differs from ''E. secundum'' by bearing no nectar in the flower.
== Description ==
''E. radicans'', like other members of subgenus ''Amphiglottium'', is a sympodial orchid which grows stems which do not swell into pseudobulbs and are covered with imbricating sheaths, produces a terminal inflorescence covered at its base by close imbricating sheaths, and produces a lip adnate to the column to its apex. The lip of ''E. radicans'' is trilobate, as with the other members of section ''Schistochila'', with the lacerate lobes which are typical of the subsections ''Carinata'' and ''Tuberculata''. ''E. radicans'' differs from the other lacerate ''Schistochila'' by producing roots from most of the stem.
''E. radicans'' seeds are quite small, at 320 seeds per milligram.〔Arditti, J. & A. K. A. Ghani "Tansley Review No. 110. Numerical and Physical Properties of Orchid Seeds and Their Biological Implications" ''New Phytologist'' 145(3) p. 389 (2000)〕〔Cherevchenck, T. M., & G. P. Kushnir, ''Orheide v kulture'' (Orchids in cultivation). Kiev, Ukraine: Naukova Dumka〕
The chromosome number of an individual collected in Ecuador has been determined as 2n = 60. Other reported chromosome numbers for ''E. radicans'' include 2n = 40, 2n = 57, 2n = 62, and 2n = 64〔Fábio Pinheiro, Samantha Koehler, Andréa Macêdo Corrêa, Maria Luiza Faria Salatino, Antonio Salatino & Fábio de Barros. "Phylogenetic relationships and infrageneric classification of ''Epidendrum'' subgenus ''Amphiglottium'' (Laeliinae, Orchidaceae)", ''Plant Systematics and Evolution'' published online 25 September 2009. Springer Wien. http://www.springerlink.com/content/k70111rh6ww5437l/〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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