Robinia hispida
Illustration
The Bristly locust (Robinia hispida ) is a shrub with red to rose -colored flowers of the subfamily of the Fabaceae ( Faboideae ). The natural range is in the United States. The species is very often used as an ornamental shrub.
Description
The Bristly locust is a 1 to 3 meters high, deciduous and root sprouts forming shrub. Young branches are pressed green and dense purple, rough, glandular and white, finely hairy. Two-year branches are brittle, dark gray-brown and densely bristly, brown hairy. The leaves are 15 to 30 inches long. The leaf stem is fitting, bristly and white, hairy curled. The top is grooved. The sub-petioles are hairy pressed white. The stipules of leaflets are grannenförmig and binding. Each sheet five to seven, rarely eight pairs are formed leaves. The leaves are glabrous, 5 to 1.8 centimeters long and 1.5 to 3.5 inches wide, the first, basal pair is often smaller. They are oval, ovate, broadly ovate or roundish, with rounded tip and rounded base and begrannter. The top young leaves is dark red and is later dark green, the underside is gray-green and the midrib is sparsely hairy pressed.
The axillary inflorescences are about 2.5 centimeters long clusters of three to eight flowers. All parts except the corolla are pressed purple, and white glandular hairs. The inflorescence axis is 4 to 8.5 inches long. The bracts are 5-6 mm long, ovate - lanceolate, sometimes truant three-lobed and gradually. You fall off early. The calyx is purple and vaguely bell-shaped. The flower cups is about 5 millimeters long, the sepals are triangular, 3-6 mm long with tailed to pfriemlicher tip. The corolla is red to rose colored. The petals are stalked. The flag is 2 inches long and 3 inches wide, approximately kidney-shaped with book term top. The wings are about 2 inches long, crescent- shaped and auriculate. The boat is 1.5 inches long, nearly triangular, with rounded tip and geöhrter. The stamens are arranged in two groups, one stamen is free in relation to the flag. The dust bags are oval. The ovary is more or less terete and has many ovules. The scar is terminal. As fruit 5-8 cm long and 8-12 mm are formed broad, flattened, straight, densely glandular- bristly provided with hair, lace sleeves with three to five seeds. The Bristly locust flowers from May to June and the fruits ripen from July to October.
Distribution and habitat requirements
The natural range is in the United States in Alabama, Georgia, in eastern Kentucky, North Carolina, South Carolina, Tennessee and Virginia. The Bristly locust grows in steppes and dry forests on dry to fresh, mildly acidic to strongly alkaline, sandy, sandy- gravelly or sandy- loamy, fertile soil in full sun to light shade locations. The species is sensitive to moisture, warmth, and usually frost hardy. It is the hardiness zone 6a associated with mean annual minimum temperatures -23.3 to -20.6 ° C.
System
The Bristly locust (Robinia hispida ) is a species of the genus Robinia (Robinia ) in the legume family ( Fabaceae ). There she is assigned in the subfamily of the Fabaceae ( Faboideae ) of the tribe Robinieae. The species was first described by Carl Linnaeus in 1767 in his work Mantissa Plantarum. The genus name Robinia was chosen by Linnaeus for the native of North America species Robinia pseudacacia, which was known as Acacia Americana Robini before. The name refers to the French court gardener and director of the Jardin des Plantes in Paris Jean Robin ( 1550-1629 ). He is said to have brought the kind of America to France. More likely, however, that his son Vespasien has the kind grown from seed Robin (1579-1662), which he had received from America. The specific epithet hispida comes from Latin and means " rough" or " hispid ".
There are three varieties:
- Robinia hispida var fertilis ( Ashe ) RT Clausen, which has also been described as a separate species Robinia fertilis Ashe.
- Robinia hispida hispida var
- Robinia hispida var kelseyi ( JF Cowell ex Hutch. ) Isely, the ex also as a separate species Robinia kelseyi JF Cowell Hutch. has been described.
Use
The Bristly locust is widely used because of their remarkable flowers as an ornamental shrub. A well-known variety is ' macrophylla ' with more vigorous growth, only soft hairy twigs and larger flowers and leaves.