Piaranthus

Piaranthus
	Piaranthus geminatus
Systematics
Order :	Enzianartige (Gentianales)
Family :	Dog poison family (Apocynaceae)
Subfamily :	Silk plants (Asclepiadoideae)
Tribe :	Ceropegieae
Sub tribus :	Stapeliinae
Genre :	Piaranthus
Scientific name
	Piaranthus
	R.Br.

The Piaranthus are a genus of plants of the subfamily Asclepiadoideae , which is assigned to the family dog venom plants (Apocynaceae).

features

The genus Piaranthus includes small, stem-succulent forms with plagiotropic shoots and grass-like growth. The shoots are spherical or cylindrical (1–6 cm × 0.8–2 cm) with a square or pentagonal cross section. The very small (about 1 mm) leaves are triangular and fall off quickly.

The inflorescence develops on the side of the stems and includes one to ten flowers that open more or less simultaneously. The flower measures 6–42 mm in diameter. The five petals are star-shaped with free crown lobes or fused bell-shaped with short crown lobes. The corolla lobes are green on the outside, yellowish on the inside, creamy yellow, ivory to whitish with red or reddish brown spots or bands. They are bald, papillary or have short hair. The side crown is intense yellow.

The paired follicles each measure 6-14 cm in length and 4-8 mm in diameter and contain up to 130 seeds.

Occurrence

The occurrence of the genus is limited to Namibia and South Africa .

Piaranthus comptus

Piaranthus parvulus

Systematics

Meve (in Albers & Meve) lists seven species (each with two subspecies and two varieties). According to WCSP by R. Govaerts, there are now nine species:

Piaranthus atrosanguineus (NEBr.) Bruyns: Southeastern Botswana to northern South Africa.
Piaranthus comptus N.E. Brown : Cape Province (southern Karoo).
Piaranthus cornutus N.E.Brown (Syn .: Piaranthus decorus ssp. Cornutus (NEBr) Meve. ), With three varieties:
- Piaranthus cornutus var. Cornutus : Southern Namibia to Orange Free State.
- Piaranthus cornutus var. Mennellii (CALückh.) Plowes : Cape Province.
- Piaranthus cornutus var. Ruschii (Nel) Bruyns : Southwestern Namibia.
Piaranthus decipiens (NEBr.) Bruyn (Syn .: Huerniopsis decipiens N.E.Brown ): It occurs in South Africa.
Piaranthus erratus Plowes : It was first described in 2014 from the western Cape Province.
Piaranthus fuscatus (NEBr.) Plowes (Syn .: Piaranthus pillansii var. Fuscatus N.E.Brown ) It was classified by the variety of Art, 2014. It occurs in the Cape Province.
Piaranthus geminatus (Masson) NEBrown : With two subspecies:
- Piaranthus geminatus subsp. decorus (Masson) Bruyns (Syn .: Piaranthus decorus (Masson) NEBrown ): It occurs in the Cape Province.
- Piaranthus geminatus subsp. geminatus (Syn .: Piaranthus barrydalensis Meve , Piaranthus geminatus var. foetidus (NEBr.) Meve ): It occurs in the southern and southeastern Cape Province.
Piaranthus parvulus N.E. Brown : It occurs in the Cape Province (southwestern Karoo).
Piaranthus punctatus (Masson) Schultes , with the varieties:
- Piaranthus punctatus var. Framesii (Pillans) Bruyn (Syn .: Piaranthus framesii Pillans ): It occurs in the Western Cape Province.
- Piaranthus punctatus var. Punctatus : It occurs in the western Cape Province.

literature

Focke Albers, Ulli Meve (ed.): Succulents Lexicon , 3rd volume: Asclepiadaceae , Ulmer Verlag, Stuttgart 2002, ISBN 978-3-8001-3982-8 .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o Rafaël Govaerts (Ed.): Piaranthus - World Checklist of Selected Plant Families of the Royal Botanic Gardens, Kew. Last accessed on November 13, 2018.

Web links

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

The Genera of Asclepiadoideae, Secamonoideae and Periplocoideae (Apocynaceae) by Sigrid Liede-Schumann & Ulrich Meve - genus Piaranthus .

[WCSP-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o Rafaël Govaerts (Ed.): Piaranthus - World Checklist of Selected Plant Families of the Royal Botanic Gardens, Kew. Last accessed on November 13, 2018.