Drosera callistos
| Drosera callistos | ||||||||||||
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Drosera callistos , flower |
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| Scientific name | ||||||||||||
| Drosera callistos | ||||||||||||
| NGMarchant & Lowrie |
Drosera callistos is a carnivorous plant from the genus of the sundew ( Drosera ).
description
Drosera callistos is a rosette-forming, perennial herbaceous plant that can reach a diameter of up to 2.3 cm. The stem axis is 5 mm long and covered with the withered leaves of the preseason.
The bud of the stipules is broadly ovate, shaggy, 4 mm long and 4 mm in diameter at the base. The stipules themselves are 4.5 mm long, 3 mm wide, 1.1 mm wide at the base and three-lobed. The middle lobe is divided into 3 segments. Each of these segments is in turn divided into 2 fringes at the top. The edges of the outer lobes are whole, the tips divided into 2 short fringes. Near the tip is another fringe that is longer than the central lobe.
The leaf blades are broadly elliptical, 2.5 mm long and 2 mm wide. The longer tentacle glands are on the edge, the shorter ones on the inside. The underside is bare. The leaf stalks are up to 6 mm long, 1 mm wide at the base and taper to 0.6 mm at the leaf blade . They are lanceolate and have a few glands.
Flowering time is October to November. The inflorescence axis is up to 7 cm long and sparse at the base. The density of the glands increases towards the tip. The inflorescence is a wrap of 6 to 12 flowers on approximately 2 mm long pedicels. The egg-shaped sepals are 3.5 mm long and 2 mm wide. The margins are whole and the tips are serrated irregularly. The entire surface is covered with a few cylindrical glands. The metallic orange petals are black at the base and are obovate, 9 mm long and 6 mm wide.
The five stamens are 2.4 mm long. The stamens are black-brown, the anthers are white and the pollen are yellow. The black-brown ovary is very broad, obovate, 0.7 mm long and 1.1 mm in diameter. The 3 black-brown, horizontal styluses are 1 mm long. The scars are also black-brown, horizontal, 2 mm long, widen in the middle and taper slightly to the rounded tip.
The formation of brood scales is typical of dwarf sundews : The elliptical, 1 mm thick brood scales are formed in large numbers from late November to early December and are approx. 1.7 mm long and 1.5 mm wide.
Distribution, habitat and status
Drosera callistos is endemic to Southwest Australia, near Gidgegannup , The Lakes, and the Brookton Hay State Forest. It thrives there in heavy, laterite-covered sandy soils or places with pure sand that are surrounded by laterite soils .
Systematics
The name of Drosera callistos is derived from Latin (callis = beautiful). By Allen Lowrie states: "The epithet Refers to the overall beauty of the plans."
If it is not in flower, this species can easily be mistaken for Drosera sewelliae . These two species have similar flower colors, but can be easily distinguished on closer inspection. Also Drosera leucoblasta is very similar, but has a pale, red spot in the center of the flower and never grows in the same habitat as Drosera callistos .
literature
- Allen Lowrie : Carnivorous Plants of Australia. Volume 2. University of Western Australia Press, Nedlands 1989, ISBN 0-85564-300-5 .
