Solanum humblotii
| Solanum humblotii | ||||||||||||
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| Solanum humblotii | ||||||||||||
| Dammer |
Humblotii Solanum is a plant from the genus of Solanaceae ( Solanum ) in the family of the nightshade family (Solanaceae). It was found only once in a collection in Madagascar .
description
Vegetative characteristics
Solanum humblotii is a shrub or liana . The plant is sparsely branched, not covered with spines, its young twigs are flexible, ribbed and hairy with trichomes that are only 0.1 mm long, tree-shaped with one to four branches . The main branches have a diameter of 3 to 4 mm, are hairless, their bark is ribbed lengthways, often flaky and almost white. The leaves stand evenly along the young shoots, leaving behind small stumps 1 to 3 cm apart. The sympodial units comprise several leaves.
The leaves are simple, elliptical, 5.5 to 7.5 cm long and 2.5 to 3 cm wide and thick membranous. As they dry, they turn reddish brown on the top and yellowish green on the underside. Both sides are hairless, only along the central rib there can be fine trichomes on both sides, similar to those of the trunk. The midrib may protrude from the underside of the leaf. Three to six pairs of primary lateral veins go from it, which are at an angle of about 60 ° to the midrib and are only very weakly developed. No further subdivision of the vein can be seen. The base is wedge-shaped or pointed, it can be straight or oblique. The leaf margin is entire and can occasionally be covered with tree-shaped branched trichomes. The leaves are briefly pointed to the front. The petiole is slender, trough-shaped, 0.6 to 1 cm long and hairy like the young twigs.
Inflorescences and flowers
The inflorescences are terminally at the tip of long, slender main branches. They are 3 to 4 cm long, not branched and consist of one or two (rarely three) flowers . A peduncle is missing or only up to 8 mm long. He and the Rhachis are hairy similar to the young tribes. The flower stalks are widened towards the tip, 1.8 to 2.5 cm long and articulated 0 to 2 mm above the base. They are covered with trichomes that are similar to those of the rest of the plant, but are longer. The buds are elliptical.
The flowers probably always appear completely bisexual. The calyx is cup-shaped and 1/2 to 2/3 as long as the crown at flowering time. It is deeply divided so that the calyx tube is only about 3 mm long. The calyx lobes are narrowly triangular, tapering to a point in front or long, they are 3 to 4.5 mm long and measure 1.5 to 2 mm at the base. They are torn to about 2 mm, whereby the tear can be different in strength at each tip. No veins can be seen, the hair consists of tree-shaped trichomes with two to three branches that are 0.1 to 0.2 mm long. The color of the crown is unknown, in herbal specimens it has dried to orange-brown. It measures about 2 mm in diameter and is lobed almost to the base. The corolla lobes are egg-shaped to linear, 1 to 1.4 cm long and about 0.3 cm wide. They have a brown midrib and are hairy on both sides, with the size and density of the trichomes decreasing towards the edges.
The anthers are free, but close together. They are fixed dorsally, elongated and about 3.5 mm long and 1.5 mm wide. They open via clearly defined pores at the tips, which do not lengthen into slits even with age. The stamens are partially fused to form a tube 0.5 to 1 mm long, they are free from each other for about 1 mm. The ovary is conical in shape and hairless. It has an upright and hairless stylus about 9 mm long, which protrudes 3 to 3.5 mm over the anthers. The scar is split and smooth.
Fruits and seeds are not known.
distribution
The species is only known from a single collection in Madagascar ; the exact location of the collection in Madagascar is uncertain. The holotype was kept in the herbarium of the Botanical Garden Berlin-Dahlem , but was destroyed. Several isotypes exist in the herbaria of the Royal Botanic Garden in Kew, the Muséum national d'histoire naturelle in Paris and the Natural History Museum in Vienna.
Systematics
Due to the lack of plant material, the systematic classification of the species has not yet been investigated using molecular biology . It is likely that it can be classified in the African, non-prickly clade around Solanum aggregatum with other Malagasy, non-prickly nightshade species .
proof
- M. Vorontsova: Solanum humblotii . In: Solanaceae Source ( online ), February 2008, accessed February 26, 2011.