Dinetus (genus of plants)

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Dinetus
Systematics
Nuclear eudicotyledons
Asterids
Euasterids I
Order : Nightshade (Solanales)
Family : Bindweed family (Convolvulaceae)
Genre : Dinetus
Scientific name
Dinetus
Sweet

Dinetus is occurring in Asia, eight kinds comprehensive plant genus of the family of wind plants (Convolvulaceae).

description

Vegetative characteristics

Dinetus are herbaceous , annual or perennial climbers . The root system consists of fiber roots, only in Dinetus duclouxii are enlarged storage organs formed. The stems are curly haired, often tomentose at the nodes , but otherwise almost hairless. The petioles are round and furrowed on the upper side or flattened, occasionally a pulvinus is formed. The leaf blades are heart-shaped and entire or lobed and thinly membranous. The vein is foot-shaped, two or three pairs of basal secondary veins and one to two (rarely three) branching veins are formed. The veins can be clearly seen, the veins are often winged on the underside.

Inflorescences and flowers

The inflorescences are single or in pairs in the axilla, they are built racemose or panicley , the flowering sequence is from the base to the tip. The persistent bracts are foliage-like and can be stalked, sessile or encompassing stems. The two (rarely three) bracts are directly below the flower . They are tiny scales, only in Dinetus ducloxii do they resemble the sepals .

The flowers are small to large and often fragrant. The five free-standing, equal or unequal sized sepals overlap roof-like (quincuncial) or the base is folded slightly wedge-shaped. The crown is funnel- or almost salver-plate-shaped. The corolla lobes are hairless except for a small tuft of hair at the tip of the axis of the petals (interplica), in the bud they are twisted folded.

The five stamens are equal or unequal in length and do not protrude beyond the crown. The lower part of the stamens is fused with the corolla tube and can be hairless or tomentose. The anthers are spear-shaped, arrow-shaped or linear and turned inwards, they jump open before they open up. The pollen grains are tricolated and not prickly. The stamp does not protrude beyond the crown. The flower base is circular, five-lobed or absent. The ovary is unilocular and contains two upright, basal standing ovules . The stylus is simple and often articulated above the base. The scar is elliptical, entire and notched or slightly bilobed on the side.

Fruits and seeds

The fruits are membranous follicles that are surrounded by a greatly enlarged, paper-like calyx. This has seven or nine (rarely five or eleven) parallel, longitudinal veins at the base, three of which reach the tip. The calyx is bent back or loosely embraces the fruit.

In the fruit there is a single seed that is elliptical to almost spherical in shape, is often winged and has a smooth, hairless surface. The basal hilum is inconspicuous and semicircular.

Systematics

External system

Within the bindweed family, the genus is classified in the tribe Cardiochlamyeae according to molecular biological knowledge . In addition to the genus Dinetus , the genera Cardiochlamys , Cordisepalum , Duperreya , Poranopsis and Tridynamia also belong to this tribe.

Internal system

Eight species belong to the genus Dinetus :

  • Dinetus decorus (WW Sm.) Staples : It occurs from Assam to Sichuan and Yunnan.
  • Dinetus dinetoides (CK Schneid.) Staples : It occurs from Assam to Sichuan and Yunnan.
  • Dinetus duclouxii (Gagnep. & Courchet) Staples : The home is China.
  • Dinetus grandiflorus (Wall.) Staples : The range extends from the Himalayas to southern Tibet.
  • Dinetus malabaricus (CB Clarke) Staples : The home is India.
  • Dinetus racemosus (Roxb.) Buch.-Ham. ex Sweet : The distribution area extends from Pakistan to Malesia and China.
  • Dinetus rhombicarpus Staples : The range extends from Assam to Myanmar.
  • Dinetus truncatus (short) Staples : The homeland is eastern Myanmar and southern China.

The type species is Dinetus racemosus .

Occurrence

The species of the genus Dinetus are widespread in Asia.

swell

Individual evidence

  1. ↑ Saša Stefanović, Daniel Austin and Robert Olmstead: Classification of Convolvulaceae: A Phylogenetic Approach (PDF; 318 kB) In: Systematic Botany , Volume 28, Number 4, 2003. pp. 791-806
  2. ↑ a b c d e f g h i Rafaël Govaerts (ed.): Dinetus. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved February 11, 2015.

literature