Yua thomsonii
| Yua thomsonii | ||||||||||||
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| Yua thomsonii | ||||||||||||
| ( MALawson ) CLLi |
Yua thomsonii is a species of the grapevine family(Vitaceae).
description
Small twigs are brownish and oblong in cross section. Young twigs are slightly furrowed. The leaves are paper-like and palmate, pinnate in five parts. The petiole is 2.5 to 6 inches long. The leaflets are 2.5 to 7 × 1.5 to 3 centimeters in size and lanceolate or obverse-lanceolate. Their underside is frosted and sometimes the leaf veins are hairy here. The leaf veins are conspicuous but not protruding. There are 4 to 6 pairs of lateral leaf veins. The leaf base is wedge-shaped. The leaf margin has 4 to 7 fine, sharp teeth on each side. The tip of the leaf is pointed or elongated. The usually 5, less often 4 petals are 3 to 3.5 millimeters in size. There are usually 5, less often 4 stamens . The stamens are about 2.5 millimeters in size. The anthers are about 1.5 millimeters in size and elliptical. The stamp is about 3 millimeters in size. The stylus are slim. The berries are 1 to 1.3 centimeters in diameter and black-purple. The seeds are 5 to 6 × approximately 4 millimeters in size. Its tip is slightly rounded.
The species blooms from April to June and fruit from July to October.
Occurrence
The species occurs in China, India and Nepal. It grows in hillside forests, on trees, on slopes and in valleys as well as in disturbed locations at altitudes of 200 to 2700 meters.
Systematics
The species was first described as Vitis thomsonii by Marmaduke Alexander Lawson in 1875 . In 1990, Chao Luang Li added her to the genus Yua as Yua thomsonii . There are 2 varieties:
- Yua thomsonii var. Thomsonii : Small twigs, petioles, leaf upper side, inflorescence axis, flower stalk and petals are hairless. The underside of the leaf is hairless or thinly downy on the leaf veins. The variety blooms from May to June and fruit from July to September. It occurs in India, Nepal and China (Anhui, southwest Fujian , Guangxi , southeast Guizhou , Hubei , Hunan , Jiangsu , Jiangxi , southeast Sichuan , Taiwan and Zhejiang ) in hillside forests at altitudes of 200 to 1300 meters.
- Yua thomsonii var. Glaucescens ( Diels & Gilg ) CLLi : This variety has hairs on at least the leaf veins on the underside of the leaf. Yua thomsonii var. Glaucescens flowers from April to June and fruit from August to October. The variety occurs in China in the provinces of Guizhou , Henan , Hubei, Sichuan and Yunnan on slopes and in valleys at altitudes of 1700 to 2700 meters.
supporting documents
- Zhiduan Chen & Jun Wen: Yua . In: Flora of China Vol. 12 Vitaceae ( online )
Web links
- Figure in the Flora of China