Vitex

from Wikipedia, the free encyclopedia
Vitex
Chaste tree (Vitex agnus-castus)

Chaste tree ( Vitex agnus-castus )

Systematics
Asterids
Euasterids I
Order : Mint family (Lamiales)
Family : Mint family (Lamiaceae)
Subfamily : Viticoideae
Genre : Vitex
Scientific name
Vitex
L.

Vitex is a genus of plants in the mint family (Lamiaceae). The approximately 250 species distributed in tropical, subtropical and moderately warm climates worldwide. A well-known species of the genus is the chaste tree ( Vitex agnus-castus ).

description

Illustration of Vitex pinnata
Zygomorphic flower of Vitex lucens

Vegetative characteristics

Vitex species grow as shrubs or trees with heights of 1 to 35 meters, rarely also climbing plants. The bark of the twigs is smooth or sparsely hairy.

The opposite arranged leaves are divided into a petiole and a leaf blade. The leaf blades are usually finger-shaped with three or five (rarely one or seven) finger leaflets . The stalked finger leaflets have smooth, serrated, sawn or incised edges. There are no stipules .

Generative characteristics

The terminal or lateral, zymous , thyrsoid or paniculate inflorescences usually have small, often early falling bracts .

The hermaphrodite flowers are zygomorphic , often relatively small, usually with double perianth (perianth). Most of the five sepals are fused , bell-shaped, funnel-shaped or tubular. The usually five white, blue, purple or yellowish petals form a two-lipped crown. The lower lip is three-lobed, with the middle lobe being greatly elongated. The upper lip is bilobed. There are four stamens , they can sometimes protrude above the crown. The ovary contains only one or two in each of its two chambers to ovules . The thin stylus ends in a two-column scar.

Fruits of Vitex trifolia , the calyx is also clearly visible.

The small and spherical to egg-shaped or obovate drupes is enveloped by the enlarged cup, and typically includes in its four chambers per a hard core with a seed. but sometimes only part of it is formed and cavities are found for it. The endocarp is hard and the mesocarp is usually fleshy. The obovate to oblong seeds often fleshy cotyledons contain ( cotyledons ), but no endosperm .

Systematics and distribution

The generic name Vitex was established in 1753 by Carl von Linné in Species Plantarum , 2, p. 638. In 1925, the lectotype Vitex agnus-castus L. was established. Synonyms for Vitex L. are: Macrostegia Nees , Neorapinia Moldenke , Paravitex H.R. Fletcher , Tsoongia Merr. , Viticipremna H.J. Lam .

The genus Vitex was formerly part of the verbena family (Verbenaceae). The reclassification into the mint family (Lamiaceae) is more recent; in this family it is in the subfamily of the Viticoideae.

The genus Vitex is distributed worldwide in tropical, subtropical and moderately warm climates. About 40 species occur in Madagascar, 38 of them only there. There are around 15 species in China.

swell

  • Shou-liang Chen, Michael G. Gilbert: Verbenaceae. : Vitex , p. 28 - the same text online as the printed work , In: Wu Zheng-yi, Peter H. Raven (Ed.): Flora of China , Volume 17 - Verbenaceae through Solanaceae , Science Press and Missouri Botanical Garden Press, Beijing and St. Louis, 1994, ISBN 0-915279-24-X . (Sections Description and Systematics)
  • SMH Jafri, Abdul Ghafoor: Verbenaceae Vitex at Tropicos.org. In: Flora of Pakistan . Missouri Botanical Garden, St. Louis (Description Section)

Individual evidence

  1. Carl von Linné: Species Plantarum , 2, 1753, p. 638 scanned at biodiversitylibrary.org .
  2. ^ Vitex at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed March 23, 2015.
  3. ^ A b Vitex in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved January 23, 2018.
  4. a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap Vitex at Tropicos.org. In: Catalog of the Vascular Plants of Madagascar . Missouri Botanical Garden, St. Louis
  5. a b c d e f g h i j k l Shou-liang Chen, Michael G. Gilbert: Verbenaceae. : Vitex , p. 28 - the same text online as the printed work , In: Wu Zheng-yi, Peter H. Raven (Ed.): Flora of China , Volume 17 - Verbenaceae through Solanaceae , Science Press and Missouri Botanical Garden Press, Beijing and St. Louis, 1994, ISBN 0-915279-24-X .
  6. a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc bd be bf bg bh bi bj bk bl bm bn bo bp bq br bs bt bu bv bw bx by bz ca cb cc cd ce cf cg ch ci cj ck cl cm cn co cp cq cr cs ct cu cv cw cx cy cz da db dc dd de df dg dh di dj dk dl dm dn do dp dq dr ds dt du dv dw dx dy dz ea eb ec ed ee ef eg eh ei ej ek el em en eo ep eq er es et eu ev ew ex ey ez fa fb fc fd fe ff fg fh fi fj fk fl fm fn fo fp fq fr fs ft fu fv fw fx fy fz ga Rafaël Govaerts (ed.): Vitex. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved January 6, 2019.
  7. a b Search for “Vitex” in the IUCN's Red List of Threatened Species .
  8. ^ R. de Kok: A revision of the genus Gmelina (Lamiaceae). In: Kew Bulletin , Volume 67, 2012, pp. 293-329.

Web links

Commons : Vitex  - collection of images, videos and audio files