Schlegeliaceae
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| ( AHGentry ) Reveal |
The Schlegeliaceae are a family of plants from the order of the mint family (Lamiales). The four genera are common between Mexico and the tropical regions of South America .
description
Vegetative characteristics
Representatives of schlegeliaceae are shrubs , half-shrubs or vines that grow upright or climbing on the floor or epiphytic life. The shoot axes do not form an internal phloem and are hairless on the surface or covered with simple glandular or glandular, unicellular or multicellular trichomes . In the internodes there are no lines or glandular areas between the petioles of the node, and no stipules are formed.
The almost leathery to leathery leaves are opposite or almost opposite, simple, mostly with entire margins (only in the genus Synapsis are the leaf edges finely sawtooth-like). The pinnate leaf blade can be covered with hairless or slightly downy hair.
Inflorescences and flowers
The inflorescences are racemose , zymose or consist only of a single flower. They stand in the leaf axils, sometimes as dense clusters, bracts are present, the flower stalks are fully developed.
The hermaphrodite flowers can be both small and large, and they are often very conspicuous. The calyx is irregularly lobed, consists of five lobes or is divided into five, remains in place when the fruit is ripe and is usually enlarged. The five-fold corolla is tubular or funnel-shaped, symmetrical on two sides or almost radially symmetrical. The corolla tube is straight and neither sack-like bulging nor spurred. The four stamens are inserted in the corolla tube. The mutually free stamens alternate with the petals. The dust bags consist of two equally sized, separated counters. In addition to the four fertile stamens, there is another sterile stamen ( staminodium ). The pistil is single, the bilobed ovary is above and contains a large number of ovules . The ovules arise on two large, axial placentas . The terminal stylus ends in a simple scar .
Fruits and seeds
The fruits are berries that do not open even when ripe. They contain a lot of seeds. The surface of the seeds is covered with a network of small elevations (muri) and contain a straight, relatively small embryo .
Systematics
The Schlegeliaceae (AHGentry) Reveal family was established by James Lauritz Reveal in Phytologia , Volume 79, Page 74 in 1996 .
External system
The Schlegeliaceae family contains four genera. For a long time the genera were assigned either to the figwort family (Scrophulariaceae) or the trumpet tree family (Bignoniaceae), but were very atypical for both families. Molecular biological studies showed that the Schlegeliaceae are not related to either of the two families. Initially, the species of the genus Thomandersia were also included in this family, but molecular biological studies suggested that this genus should be placed in the monogeneric family Thomandersiaceae.
Internal system
The Schlegeliaceae family contains four genera with about 35 species.
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Exarata A.H.
Gentry : It contains only one species:
- Exarata chocoensis A.H.Gentry : It occurs from Colombia to Ecuador.
- Gibsoniothamnus L.O.Williams : The approximately 12 species are distributed from Mexico to Colombia .
- Schlegelia Miq. : The approximately 23 species are distributed from Mexico to tropical South America.
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Synapsis Griseb. : It contains only one type:
- Synapsis ilicifolia Griseb. : This endemic occurs only in eastern Cuba .
swell
Individual evidence
- ^ A b c d William Burger, Kerry Barringer: Schlegeliaceae. In: Flora costaricensis. In: Fieldiana , Botany, Volume 41, 2000. pp. 69-77.
- ^ AH Wortley, DJ Harris, RW Scotland: On the Taxonomy and Phylogenetic Position of Thomandersia. In: Systematik Botany , Volume 32, Number 2, 2007. pp. 415-444.
- ↑ David C. Tank et al .: Review of the systematics of Scrophulariaceae sl and their current disposition. In: Australian Systematic Botany , Volume 19, 2006, pp. 289-307. PDF. (PDF; 267 kB)
- ↑ a b c d e f Rafaël Govaerts (Ed.): Schlegeliaceae. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved December 26, 2018.
