Croton chittagongensis
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| Croton chittagongensis | ||||||||||||
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Croton chittagongensis is aspecies of the genus Croton in the milkweed family knownfrom a single specimen from 1939. This specimen was found in Myanimukh in the Chittagong Hill Tracts , Rangamati District , Chittagong Division in Bangladesh .
description
Croton chittagongensis is a small tree with a bark that smells like pepper or ginger . Young buds have a hairy, felty surface, while young twigs are hairless. The hairless leaves are elongated to lanceolate with a serrated edge. They have a length of up to nine and a width of up to 2.7 centimeters, with a petiole up to eight millimeters long. The inflorescences are eleven to twelve inches long with lateral flowers. The flowers develop early, with flowering in May. The male flowers are two or three together. Your flower stalks are six to ten millimeters long. The five hairy sepals are elongated triangular, two to two and a half millimeters long and about one millimeter wide. The petals are elongated elliptical or lanceolate with a length of two to three millimeters and a width of one millimeter. The ten to twelve stamens are three to four millimeters long and have elongated anthers . The female flowers stand individually on six to ten millimeter long flower stalks. The five or ten sepals are oval or elliptical in shape and hairy. They are 2.8 to five millimeters long and 1.5 to three millimeters wide. The five petals are thread-like or elongated lanceolate and about one millimeter long. The ovoid ovary has four to five millimeter diameter and three pens of 5 to 6.5 millimeters in length.
Croton chittagongensis is closely related to Croton sublyratus , but differs from this species in the longer male flower stalks, the internally hairy sepals of both sexes, the egg-shaped ovaries and the longer styles. Another very similar species is Croton wallichii .
distribution
The type location of Croton chittagongensis is Myanimukh ( 22 ° 59 '0 " N , 92 ° 12' 0" O ) in the CHT , district Rangamati , Division Chittagong . There the species was detected once on the flank of a wooded hill. The place is a little west of the Karnaphulistauseeses .
Hazard and protection
Despite intensive searches at the type site and other places, Croton chittagongensis could not be found again. There is concern that the species has become extinct.
Systematics
The genus Croton is distributed almost throughout the tropics with more than 1300 species. It belongs to the tribe Crotoneae in the subfamily Crotonoideae within the family Euphorbiaceae .
Initial description
It was first described in 1983 by the Indian botanists Tapas Chakrabarty and NP Balakrishnan from the Botanical Survey of India . Chakrabarty and Balakrishnan had not been able to identify several herbaric plants during a revision of the Indian species of the genus Croton . Croton chittagongensis was described after one of these collection specimens, which was collected in May 1939 by the British amateur botanist Edith Vere Dent . This holotype is in the botanical collection of the Acharya Jagadish Chandra Bose Indian Botanic Garden , the former National Botanical Garden of India in Haora near Kolkata . The species name chittagonga refers to the district of Chittagong , in which the type is found.
Individual evidence
- ↑ a b c d T. Chakrabarty and NP Balakrishnan: Notes on the genus Croton L. (Euphorbiaceae) . In: Proceedings of the Indian Academy of Sciences (Plant Sciences) 1983, Volume 92, No. 4, pp. 363-371, doi: 10.1007 / BF03053016 .
- ↑ a b M. K. Pasha: An Evaluation of Endemism and Endemics in Bangladesh Flora . In: Eivin Røskaft and David J. Chivers (Eds.): Proceedings of the International Conference on Biodiversity - Present State, Problems and Prospects of its Conservation. January 8-10, 2011. University of Chittgaong, Chittagong 4331, Bangladesh . University of Chittagong 2012, pp. 57-76, ISBN 978-82-998991-0-9 .
- ↑ MK Pasha, T. Chakrabarty and NP Balakrishnan: A taxonomic revision of Croton L. (Euphorbiaceae) in Bangladesh . In: Journal of Economic and Taxonomic Botany 2013 [2016], Volume 37, No. 2, pp. 379-389, ISSN 0250-9768 .
- ↑ a b M. Atiqur Rahman and M. Enamur Rashid: Status of endemic plants of Bangladesh and conservation management strategies . In: International Journal of Environment 2013, Volume 2, No. 1, pp. 231–249, doi: 10.3126 / ije.v2i1.9224 .