Euchresta

Euchresta is the only plant genus of the tribe Euchresteae within the legume family ( Fabaceae ). This genus comes with about four species found in Asia.

Description

Appearance and leaves

The Euchresta species are shrubs.

The arranged alternate, stalked leaves are imparipinnate, with three to seven leaflets. The petiole has a cushion. The leaflets are arranged alternately along the Blattrhachis. The stipules are small and fall off early, stipules of leaflets are not available.

Inflorescences and flowers

In total racemose inflorescences, the flowers and small, durable bracts stand together. Bracts absent.

The hermaphrodite flowers are zygomorphic and fünfzählig double perianth. The five sepals are bell-shaped to Roehrig fused with five calyx teeth. The far the superior calyx corolla has the typical structure of a butterfly blossom. The spiked, almost upright, narrow flag is slightly longer than wings and keel. The free, very long nailed wings are oblong, obtuse or slightly sickle-shaped. The boat is very similar to the wings. The stamens of nine of the ten stamens are fused together something and the little dust bag are all the same. The single carpel contains only one or usually two ovules. The thin, incurved style ends in a small, capitate stigma.

Fruit and seeds

The drupe- like, ovoid or ellipsoid, bluish - purple-colored legumes not open at maturity and contain only one seed. The seeds have a membranous, white seed coat ( testa).

Sets of chromosomes

The basic chromosome number is x = 9

Systematics and distribution

The genus Euchresta is found in India, Bhutan, Nepal, China, Vietnam, Korea, Laos, Thailand, Taiwan, Japan, Indonesia and the Philippines.

The first description of the genus Euchresta took place in 1840 thanks to John Joseph Bennett in Plantae Javanicae Rariores, p 148, Plate 31 type species is Euchresta horsfieldii, 1810 as Andira horsfieldii Lesch. was first described. The genus of Euchresta is the only genus of the tribe Euchresteae in the subfamily Faboideae within the Fabaceae. The Tribe Euchresteae ( Nakai ) Ohashi was first published in 1973 by Hiroyoshi Ohashi, Journal of Japanese Botany, 48, 229.

There are about four Euchresta species ( here indicating their home areas ):

  • Euchresta formosana ( Hayata ) Ohwi: She is in Taiwan, home to the Japanese Ryukyu Islands, and the Philippines.
  • Euchresta horsfieldii ( Lesch. ) Benn. Coming into India, Bhutan, Nepal, Laos, Thailand, Vietnam, Indonesia, in the Philippines and the Chinese provinces of southeastern Yunnan and southeastern Xizang.
  • Euchresta japonica Hook. f ex rule ( Ex.: Euchresta trifoliata Merrill ): It occurs in Japan, Korea and the Chinese provinces of Guangdong, Guangxi, Guizhou, Hunan, Jiangxi, Sichuan, Zhejiang.
  • Euchresta tubulosa Dunn: With three varieties it comes in altitude 300-1700 meters only in the Chinese provinces of Guangxi, northwestern Hubei, Hunan, Sichuan and Yunnan ago.

Swell

  • Hang Sun & Kai Larsen: Euchresteae in the Flora of China, Volume 10, 2010, p 98 tribe, genus and species. (Section Description and systematics)
  • Robert Hegnauer: chemotaxonomy of plants, Volume XIB -2, Springer, 2001 ISBN 3-7643-5862-9. ( Euchresteae: page 1030-1036 )
Rosids Takenoshin Nakai Rachis testa (botany) Agricultural Research Service
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