Vitis davidii

David Vine David or vine (Vitis davidii ) is a climbing shrub with black or purple fruit from the family of grapevine family ( Vitaceae ). The natural range of the species is in China. The species is rarely cultivated.

Description

David Vine is a 15 meters high climbing shrub occupied with terete, leafless shoots and drüsenspitzigen spines. Young shoots are längsgefurcht. The tendrils are branched. The stipules are greenish brown, 2-3 mm long and 1-2 mm wide, ovate - lanceolate, glabrous and fall off early. The leaves have a glandular bristly stalk. The leaf blade is simple, 5-12 cm long and 4-16 cm wide, broadly ovate, undivided or slightly three-lobed, with pointed or stachelspitziger blade tip and deeply heart-shaped leaf base. The leaf margin has on both sides of twelve to 33 sharps or stachelspitzige teeth. There shall be five basal and four to five pairs of lateral veins. The upper leaf surface is glossy dark green and glabrous, the underside is bluish to gray- green and up to the glandular - bristly leaf veins almost bald. The autumn color is bright crimson.

The flowers grow in 7 to 24 cm long panicles with well-formed basal branches. The inflorescence axis has a diameter of 1 to 2.5 inches and is bald. The flower stems are 1 to 2 millimeters long and bare. The buds are 1.2 to 1.5 millimeters long and have a rounded tip. The sepals are small. The filaments are threadlike, the anthers yellow, elliptical and 0.6 to 0.7 millimeters long. The ovary is conical, the style short, spread the scar. As fruits black, round berries with diameters of 1.2 to 2.5 centimeters are formed. The seeds are obovate -elliptic with rounded and blunt tip. David Vine flowers from April to June and the fruits ripen from July to October.

Occurrence and habitat requirements

The natural range is in China in the provinces of Anhui, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Sichuan, Yunnan and Zhejiang. David vine grows in forests, in the bush, on hills and in valleys at altitudes of 500-2300 meters, on moderately dry to moderately moist, acidic to neutral, sandy to sandy- rich, moderately fertile soil in sunny locations. The species is thermophilic and usually frost hardy. It is the hardiness zone 7a associated with mean annual minimum temperatures -17.7 to -15.0 ° C ( 0-5 ° F).

System

David grapevine (Vitis davidii ) is a species in the genus of grapevines ( Vitis ), where it is assigned to the subgenus Vitis. The genus is attributed to the family of grapevine family ( Vitaceae ) of the subfamily Vitoideae. The species was described in 1833 by Frédéric Caillaud Romanet you as Spinovitis davidii ( basionym ) for the first time scientifically. Gustave Louis Émile Foëx put the type in 1886 as Vitis davidii in the genus of vines. The genus name Spinovitis is now considered synonymous with Vitis. The genus name comes from the Latin Vitis and is used for the " vine " and the " vine ".

We distinguish at least three varieties:

• Vitis davidii var ferruginea Merrill & Chun with reddish brown hairy leaf. The variety blooms from April to July. The distribution area is located in the provinces of Fujian, Guangdong, Hubei and Jiangx in bush forests and hills of 500 to 1200 meters above sea level.
• Vitis davidii var davidii with prickly branches, bare leaf underside and purple ripe berries. The variety flowers from April to June and the fruits ripen from July to October. The distribution area is located in the provinces of Anhui, Chongqing, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Sichuan, Yunnan and Zhejiang in the bush forests, on hills and in valleys between 600 and 1800 meters.
• Vitis davidii var cyanocarpa ( Gagnepain ) Sargent with nodular older branches and little or no prickly young branches, bare lower leaf surface and blue-black berries ripen. The variety flowers from April to May and the fruits ripen from August to September. The distribution area is located in the provinces of Anhui, Hubei and Yunnan in forests and bushland in 600-2300 meters above sea level.

Another variety Vitis davidii var hispida XDWang & SCChen was described in 1999.

Use

David Vine is sometimes used due to the remarkable autumn colors and the impressive fruits as an ornamental shrub.