Sterculia khasiana
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Sterculia khasiana is a likely extinct species of the genus Sterculia ( Sterculia ) in the subfamily of sterculioideae (Sterculioideae).
features
Sterculia khasiana was a medium-sized tree of unspecified height. The bark of the young twigs and the inflorescences were rust-colored, downy hairs. The leaf stalks were 8 to 13 mm long. The simple leaves were 9 to 17 cm long and 4 to 7.5 cm wide. The leaf blade was elliptical or obovate, lanceolate, somewhat narrowed near the leaf base, briefly pointed at the tip and with entire margins. The leaf surfaces were somewhat leathery and smooth. The leathery, linear or lanceolate and early falling stipules were 4 to 5 mm long.
The flowering period was between May and June. The short, axillary or terminal, loose racemose inflorescences were quite spreading. The inflorescence axis was erect and delicate. The 7 to 15 mm long pedicels were erect and protruding. The bracts were tiny, ovate-lanceolate and sloping early. The calyx was 1 to 1.5 cm long. The outside was woolly hairy, the inside finely hairy. The crown tube was short. The lips were linear-lanceolate and three-nerved. In the male flowers, the 2 mm long, thick, protruding stamp column carried fertile anthers. The ovary of the female flowers was hairy and had a curved style. Fruits are not known.
Occurrence
Sterculia khasiana was collected in subtropical forests in the Khasi Hills at an altitude between 1000 and 1500 m.
status
Sterculia khasiana was added to the list of extinct plant species by the IUCN in 1998. The species has only been proven by three people in the 19th century. The first was the British botanist William Griffith (1810-1845), who collected Sterculia khasiana in the Khasi Hills at an unnamed time. In 1873 a collector named Rutton discovered the second specimen. The last sighting took place in 1877 by the botanist Charles Baron Clarke (1832–1906). Since then the species has not been rediscovered. The habitat has been affected by human activities such as slash and burn and agricultural use.
Taxonomy
The specific epithet refers to the site , the Khasi Hills in the east Indian state of Meghalaya . The first scientific description was made in 1934 by Peary Mohon Debbarman based on three herbarium specimens collected in the 19th century , which are in the Central National Herbarium, Haora (formerly Calcutta Herbarium CAL).
literature
- PM Debbarman: Flora of Assam. , 1934, Volume 1. Published under the Authority of the Government of Assam. Shillong. P. 154.
- MPNayar & ARK Sastry, (Eds.) Red Data Book of Indian Plants. 1987. Volume 1. Botanical Survey of India, Calcutta. P. 354.
- B. Sharma & M. Sanjappa (Eds.): Flora of India . Volume 3: Portulacaceae-Ixonanthaceae , Botanical Survey of India, Calcutta, 1993. pp. 458, 466, 467
Web links
- Sterculia khasiana inthe IUCN 2013 Red List of Threatened Species . Listed by: World Conservation Monitoring Center, 1998. Retrieved February 25, 2014.