Brunfelsia burchellii
| Brunfelsia burchellii | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Brunfelsia burchellii | ||||||||||||
| Plowman |
Brunfelsia burchellii is a species from the Guianenses section of the genus Brunfelsia . It occurs in the Brazilian states of Goiás and Maranhão .
description
Vegetative characteristics
Brunfelsia burchellii is a shrub whose mature branches reach a diameter of 2 to 3 millimeters, are protruding and have a shiny, yellowish to dark brownish bark that is torn lengthways . The leaves are scattered on the branches with 1 to 6 millimeter short petioles. The broad to narrowly ovate, firmly membrane-like to membranous leaf blade is 70 to 180 millimeters long and 30 to 75 millimeters wide. Towards the front it is pointed and usually ends with a long, needle-shaped, often sickle-shaped point, but sometimes only sharply pointed. The leaf margin is finely ciliate, the base is rounded to blunt. Both sides are hairless, matt or only slightly shiny, the top is medium green, the underside is more matt and slightly paler. From the leaf axis five to nine pairs of strongly curved side veins go out, which unite to a circumferential vein near the leaf edge. The leaf veins protrude from the underside of the leaf.
Inflorescences and flowers
The inflorescences are at the end of the newly grown branches of the current year and consist of one to three flowers . They stand on an inflorescence stalk up to 14 millimeters long . This is constant and sparsely glandular-hairy, later balding. On each flower there are one to three sloping bracts , which are 4 to 20 millimeters long, linear to lanceolate in shape and are pointed towards the front.
The flower stalks are 4 to 8 millimeters long, measure 1 millimeter in diameter and are sparsely glandular-hairy, later balding. The calyx are tubular to tubular-bell-shaped fused, the calyx is round, 11 to 20 millimeters long and measures 5 to 9 millimeters in diameter. It is covered with isolated glandular and later sloping hair and streaky veins. The calyx teeth are 2 to 6 millimeters long, irregular, triangular-egg-shaped and tapered to a point towards the front and finely glandular. The corolla tube is 24 to 28 millimeters long and thus about 1½ to 2 times as long as the calyx. It measures 1.5 to 2 millimeters in diameter, at the transition to the coronary hem it expands to a diameter of 5 millimeters. The coronet is protruding and measures 18 to 30 millimeters in diameter. The almost identically shaped crown lobes are rounded and overlap on the side edges.
The stamens start in the upper part of the corolla tube, the stamens are 1 millimeter wide and strip-shaped. The upper pair is about 3.5 to 6 millimeters long, slightly curved towards the front or almost straight. The lower pair is 3 to 4 millimeters long. The anthers measure 1 millimeter in diameter and are circular-kidney-shaped. The ovary is 1.5 millimeters long and conical-ovoid. The stylus is 20 to 21 millimeters long, at its tip it is widened and curved so that the scar stands between two anthers. The scar is 1 millimeter long and easily divided in two, with the upper lobe being slightly larger.
Fruits and seeds
Fruits and seeds of the species are unknown.
Occurrence and locations
The species is only known from a few collections. The distribution area is in the basin of the upper Rio Tocantins in the Brazilian states of Goiás and Maranhão .
Botanical history
The species was first described in 1981 by Timothy Charles Plowman . The type epithet honors William John Burchell , who collected a specimen of the species between 1828 and 1830, which was chosen as the type specimen . The holotype is kept in the herbarium of the Muséum national d'histoire naturelle in Paris , isotypes exist in the herbaria of the Royal Botanical Gardens Kew and the Nationaal Herbarium Nederland in Leiden .
literature
- Timothy C. Plowman (Author), Sandra Knapp, JR Press (Editor): A Revision of the South American Species of Brunfelsia (Solanaceae) . Field Museum of Natural History, Chicago August 1998, ISBN 978-9998104693 . (Fieldiana Botany, New Series, number 39).