Drosera solaris
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| Drosera solaris | ||||||||||||
| A. meat m. , Wistuba & S.McPherson |
Drosera solaris is a carnivorous plant from the family of the Sundew Family (Droseraceae) and was from 2007 Andreas Fleischmann , Andreas Wistuba and Stewart McPherson first described. It is endemic to a mountain range in Guyana ,South America.
description
Drosera solaris is a perennial herbaceous plant. As a young plant it forms a native rosette , but with increasing age it continues to grow in height, reaches a height of up to ten centimeters and forms a multi-branching stem axis . At the upper end of the stem axis, the leaves are in the form of a rosette, young leaves point upwards, older leaves bend back. Dead leaves do not fall off, but hang down on the stem axis, around which it forms a coat that thickens towards the top.
At the base of the petiole, grown around one millimeter on this, there are fused, initially white, later yellowish-brown stipules , membranous, 7.5 to 8 millimeters long and towards the blade in four 7 millimeters long, narrowly lanceolate to slotted thread-like, tapering segments. The green to golden yellow leaf stalk is 7 to 7.5 millimeters long and up to 1 millimeter wide, finely papilous on the upper side, covered with 1 to 2 millimeter long, white hairs on the underside. The red leaf blade is approximately circular, rounded at the tip of the leaf, 2 to 3 millimeters long and 2 to 2.5 millimeters wide, and on the edge and on the upper side it is covered with stalked glands to catch prey.
The one or two upright inflorescences are 6 to 7.5 millimeters long and have only one or two flowers . The flower stem is extremely short, if at all, with a maximum length of 0.2 millimeters. The upright flower stalk, however, is 4 to 5.5 millimeters long and densely hairy at the base with 1 to 2.5 millimeters long, white hairs. Towards the base of the flowers these become less, are only up to a millimeter long and interspersed with short-stalked glandular hairs. The bell-shaped chalice is 4 millimeters long and 3 millimeters wide; it is also covered with white hairs up to 0.5 millimeters long as well as with short-stalked glandular hairs. The broad, lanceolate, red sepals are 2 to 2.5 millimeters long and halfway up to 2 millimeters wide, stand upright during flowering and bend back at the fruit. The white petals are broadly inverted-ovoid, 2.5 millimeters long and 2 millimeters wide.
The white stamens are up to 0.2 millimeters thick, the connective is widened, the anthers and pollen are yellow. The approximately round ovary is around 1 millimeter thick, smooth and greenish-yellow. It found three each undivided at the base, but after 0.1 millimeters branching, about 2 millimeters long stylus . They are smooth, reddish at the base and white towards the tip, the scars are divided into two parts or are fan-shaped. The capsules open lengthways along the capsule walls and, after opening, form a bowl in which the seeds rest and from which the seeds are thrown out of the seed capsule by the "impact" of a raindrop (raindrop or splash cup spread). The egg-shaped to almost round seeds are almost 0.6 millimeters long, black and shiny.
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Distribution and habitat
The species is only known from the collection of the holotype on Mount Yakontipu in Guyana on the border with Brazil in the triangle with Venezuela; Occurrences on neighboring mountain peaks are suspected. Drosera solaris thrives there just below the summit at an altitude of 2065 m on a plateau in a small clearing of a cloud forest made of Bonnetia roraimae . There it is associated with Sumpfkrug hybrids, Epidendrum species, Stegolepis guianensis , Xyris species and Orectanthe sceptrum . The location is in light shade on a peaty substrate with lots of leaves; isolated specimens in full sun are particularly strongly colored. Locations in Bonnetia roraimae forests appear to be essential. In the slightly higher lying open wetlands of the summit, Drosera solaris is missing , here instead Drosera roraimae is widespread.
Systematics
Drosera solaris was discovered in September 2005 and was first described by Andreas Fleischmann, Andreas Wistuba and Stewart McPherson at the end of 2007. The type epithet "solaris" emphasizes the radiant, luminous appearance of the plants. Although they superficially resemble Drosera meristocaulis , closer inspection reveals their relationship to Drosera felix or Drosera kaieteurensis . Above all, seed spread is a common feature; all three types are rain ballists . Like this, it is classified in the Drosera section of the subgenus of the same name.
proof
- Andreas Fleischmann, Andreas Wistuba, Stewart McPherson: Drosera solaris (Droseraceae), a new sundew from the Guayana Highlands. In: Willdenowia. Volume 37, 2007, pp. 551-555. DOI: 10.3372 / wi.37.37214
Individual evidence
Most of the information in this article has been taken from the sources given under references; the following sources are also cited:
- ↑ Stewart McPherson: New Species - Drosera solaris , Online ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. , Accessed June 24, 2008
Web links
- Electronic supplement for the initial description with pictures in situ , online