Protoschwenckia mandonii
| Protoschwenckia mandonii | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name of the genus | ||||||||||||
| Protoschwenckia | ||||||||||||
| Soler. | ||||||||||||
| Scientific name of the species | ||||||||||||
| Protoschwenckia mandonii | ||||||||||||
| Soler. |
Protoschwenckia mandonii is a plant type from the family of the nightshade family (Solanaceae), which in the Andes one hand in Bolivia, on the other hand on the opposite side of the mountain in Brazil occurs. It is the only species in the genus Protoschwenckia .
description
Vegetative characteristics
Protoschwenckia mandonii are small, 0.4 to 0.8 m, rarely up to 1.0 m high shrubs that are profusely branched. The hair of the plant consists of two- to nine-cell, non-glandular trichomes , as well as glandular trichomes with single-cell, two-cell or multicellular heads. Branched trichomes appear only occasionally. The cuticle of the glandular trichomes is smooth, that of the others warty. The cells of the shoot bark , the pulp and the mesophyll have no drusen (star-like crystals), but contain smaller needle-shaped or prismatic crystal sand particles . Stone cells can also be found in the cells of the marrow. The shoot bark has a starchy sheath without Caspary stripes , the inner phloem is fibrous.
The leaves are ovate-elongated, heart-shaped at the base, pointed towards the front. The leaf blade is 0.95 to 3 cm long and 0.3 to 1.6 cm wide. The leaf stalks are usually 5 to 8 mm long, extreme values range from 2 to 13 mm.
Inflorescences and flowers
The inflorescences are umbelrispig , the inflorescence stalks have a length of 2.5 to 4.5 mm, rarely up to 1.3 mm. The calyx and crown of the flowers are radially symmetrical and five-fold. The calyx is a total of 3.5 to 5 mm long, the five calyx teeth are of the same shape, one-nerved, triangular-elongated and pointed. The calyx tube is about 2.5 to 3 times longer than the calyx teeth. The yellow crown is tubular, 6.5 to 9 mm, rarely up to 10 mm long, the corolla lobes are long, pointed, folded inward or slightly rolled up, four to five times longer than wide. The corolla tube is a little more than 1.5 times longer than the corolla lobes. The bud coverage is folded in valvat, but tends slightly to contorten bud coverage.
The reproductive organs of the flower are completely hidden in the crown. The four stamens come in two slightly different forms, which differ only in the slightly higher attachment point of the two lateral stamens. The stamens are thread-like awl-shaped and fixed in the lower third of the corolla tube. From the point of fixation down, they are tomentose. The stamens are about 1.5 times longer than the anthers. These are fixed dorsally (on the back), are about 1.2 to 1.3 mm long, the two counters are free from each other in the lower third. The pollen has three germ folds (tricolpat), only in exceptional cases four germ folds (tetracolpat). The ovary has many ovules. The nectaries are thick, pillow-shaped. The stylus is 2 mm very short and only slightly longer than the ovary. The scar is impressed in the shape of a disc-shaped head.
Fruits and seeds
The fruits are capsules that are 3 to 5 mm long or almost as long as the calyx that closes around the fruit. They jump up in the form of crevices in the partition wall, after opening they are inversely conical in shape and have two forked capsule valves. The fruits contain about 22 seeds that are almost 1 mm long and almost kidney-shaped. The surface of the semen is reticulated, the embryo is slightly curved, the length of the cotyledons corresponds to a quarter of the entire embryo. The endosperm is abundant.
Occurrence
The species occurs in the departments of La Paz and Cochabamba in the Bolivian Andes and on the opposite side of the mountains in Mato Grosso , Brazil .
literature
- Armando T. Hunziker: The Genera of Solanaceae . ARG Gantner Verlag KG, Ruggell, Liechtenstein 2001. ISBN 3-904144-77-4 .