Utricularia delphinioides
| Utricularia delphinioides | ||||||||||||
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| Utricularia delphinioides | ||||||||||||
| Thorel ex Pellegr. |
Utricularia delphinioides is a plant from the genus of the water hoses ( utricularia ) within the family of lentibulariaceae (Lentibulariaceae). This carnivorous plant species (carnivore) grows terrestrially.
description
Appearance
Utricularia delphinioides is a presumably annual, herbaceous plant that reaches heights of 4 to 60 centimeters. Like all water hoses, it is rootless. Numerous thread-like rhizoids, around 1 centimeter long and tapering from 0.3 millimeters to 0.1 millimeters thick, which are often papillary branched, extend from the base of the flower stem . The numerous capillary stolons are branched, several centimeters long and around 0.2 millimeters thick, the internodes are 3 to 5 millimeters long.
Leaf and trap
The short-stemmed foliage leaves standing in a rosette or individually grow upright from the nodes of the stolons; they are absent during the flowering period. The leaf blade is narrow-linear with a rounded tip, between 0.5 and 1 millimeter wide and 1 to 2.5 centimeters long.
The numerous round traps are 1 to 2 millimeters long, short-stalked and can be found on leaves and stolons. The opening is horizontal, in front of it are two relatively long, curved back capillary appendages, which are covered with forked hair on the inside. The number of traps drops significantly during flowering.
Inflorescence and flower
In the single, upright, racemose inflorescence there are usually 7 to 15 (1 to 20) flowers close together. The bald and cylindrical flower stalk is 1 to 2 millimeters thick and covered with numerous scale leaves that are similar to the bracts . The latter are at the lower end of the flower stalks, are broadly ovate with a blunt tip and 2.5 to 6 millimeters long. The bracts are 2 to 3 millimeters long, but considerably narrower than the bracts (up to 0.5 millimeters wide), linear and pointed at the extreme end. The thin flower stalk is usually 4 to 6 (1 to 12) millimeters long.
The fragrant, hermaphrodite flowers are zygomorphic and five-fold with a double flower envelope . The two unevenly shaped sepals are 6 to 9 millimeters long, narrowly egg-shaped and flattened at the base. The upper sepal is pointed, the lower one is slightly shorter and notched at the tip hardly visible. The two petals are deep blue (often with a metallic sheen), blue-violet or purple and together 1.2 to 2.5 centimeters long. The upper lip (the "upper lip") is slightly smaller than the lower one, 0.5 to 1.2 centimeters wide, and starting from the rectangular base it is approximately circular. The lower petal (the "lower lip") is helmet-shaped and round and thickened at the base. The awl-shaped, pointed spur is 4 to 6 millimeters long, slightly curved and protrudes downwards from under the lower lip.
Fruit and seeds
The 3 to 4 millimeter long, elliptical capsule fruits open lengthways and release the seeds. The broad, egg-shaped seeds are about 0.3 millimeters long.
Occurrence
Utricularia delphinioides is native to Laos , Cambodia , Thailand, and Vietnam . It thrives at altitudes from 0 to 1300 meters. It inhabits wet, open locations with acidic soils between grasses, in pine forests or on rocks, but is also found in rice fields.
Systematics
The first description of utricularia delphinioides was made in 1920 by Clovis Thorel in François Pellegrin : Bulletin du Muséum d'Histoire Naturelle , Volume 26, page 180th
The species Utricularia delphinioides belongs to the Oligocista section from the subgenus Bivalvaria in the genus Utricularia .
The dwarf form of the species described as Utricularia delphinioides var. Minor in 1920 by Pellegrin and endemic to Thailand was discarded in 1989 by Taylor in The genus Utricularia — A taxonomic monograph . In 2005 Parnell referred to the results of series of measurements that could justify classification as a separate taxon.
literature
- Peter Taylor: The Genus Utricularia. A Taxonomic Monograph (= Kew Bulletin. Additional Series. 14). Royal Botanic Gardens - Kew, London 1989, ISBN 0-947643-72-9 , pp. 365-368.
- John AN Parnell: An account of the Lentibulariaceae of Thailand. In: Thai Forest Bulletin. Botany. Vol. 33, 2005, ISSN 0495-3843 , pp. 101-144, here pp. 117-120, ( online ).
Individual evidence
- ↑ a b Utricularia delphinioides at Tropicos.org. Missouri Botanical Garden, St. Louis, Retrieved November 22, 2018.