Australluma

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Australluma
Systematics
Order : Enzianartige (Gentianales)
Family : Dog poison family (Apocynaceae)
Subfamily : Silk plants (Asclepiadoideae)
Tribe : Ceropegieae
Sub tribus : Stapeliinae
Genre : Australluma
Scientific name
Australluma
Plowes

The plant genus Australluma belongs to the subfamily of the silk plants (Asclepiadoideae) in the family of the dog poison plants (Apocynaceae). This genus contains only two succulent species.

description

Vegetative characteristics

Australluma species grow as trunk succulent perennial plants . The succulent, only 3 to 5 mm wide, blue-green, cylindrical stem axes are smooth, have four rounded edges and reach heights of 20 to 30 cm. They contain clear milky juice . Subterranean rhizomes up to 8 mm thick are formed. It happens that all above-ground parts of the plant die off and new above-ground shoot axes are formed again after the dry season.

The opposite leaves, which are reduced to succulent, egg-shaped, 1 mm long scales, fall off early. The stipules are transformed into egg-shaped glands.

Generative characteristics

Distributed at the internodes on the stem axis are pseudo-gold inflorescences with only one or two flowers without bracts. and flower stalks are smooth. The odorless (exception among the related genera) flowers are hermaphroditic, radial symmetry , five-fold with a double perianth . The five sepals are hairless on both sides. The five 4 to 6 mm long petals are spread out flat with the edges of the corolla lobes bent back and between a quarter to half of their length grown together with 200 to 500 µm long hairs ( trichomes ) evenly distributed on the surface. The inside of the petals is green with purple spots and the outside is solid green. The brownish secondary crown is divided into staminal and interstaminal secondary crown . The upright pollinia are broadly ellipsoidal. There are two smooth, free, upper carpels . The scar head is white. Nectar is formed.

The follicles , which are usually paired together and are not fused together even when ripe, have blunt edges and are slender.

The chromosome numbers are 2n = 22.

Systematics and distribution

This genus occurs only in the Capensis . Australluma peschii only thrives in summer rain areas in Namibia .

The genus Caralluma R.Br. was published in 1995 by Darrel Charles Herbert Plowes in A reclassification of Caralluma R. Brown (Stapelieae: Asclepiadaceae). in Haseltonia , 3, 1995, pp. 49-70 divided into eight genera and the genus Australluma Plowes newly established. Type species is Australluma peschii (Nel) Plowes .

The genus Australluma belongs to the Subtribus Stapeliinae from the tribe Ceropegieae in the subfamily Asclepiadoideae within the family of the Apocynaceae .

There are currently two species of Australluma :

  • Australluma peschii (Nel) Plowes (Syn .: Caralluma peschii Nel )
  • Australluma ubomboensis (I.Verd.) Bruyns (Syn .: Caralluma ubomboensis I.Verd. , Pachycymbium ubomboensis (I.Verd.) MGGilbert )

swell

  • Darrel Charles Herbert Plowes in A reclassification of Caralluma R. Brown (Stapelieae: Asclepiadaceae). in Haseltonia , 3, 1995
  • Sigrid Liede-Schumann & Ulrich Meve: The Genera of Asclepiadoideae, Secamonoideae and Periplocoideae (Apocynaceae) , 2006: On the genus Australluma - Online at INTKEY databases of the DELTA System . (Section description and systematics)
  • Ulrich Meve & Sigrid Liede-Schumann: A molecular phylogeny and generic rearrangement of the stapelioid Ceropegieae (Apocynaceae-Asclepiadoideae). , in Pl. Syst. Evol. , 234, 2002, pp. 171-209.
  • Ulrich Meve & Sigrid Liede-Schumann: Subtribal division of Ceropegieae (Apocynaceae-Asclepiadoideae) , in Taxon , Volume 53, 2004, pp. 61-72.
  • Peter V. Bruyns: Stapeliads of Southern Africa and Madagascar. , 2005. 2 volumes with a total of 606 pages: ISBN 1-919766-37-5 and ISBN 1-919766-38-3

Individual evidence

  1. ^ Darrel Charles Herbert Plowes: A reclassification of Caralluma R. Brown (Stapelieae: Asclepiadaceae). in Haseltonia , 3, 1995, pp. 49-70.
  2. ↑ Ulrich Meve & Sigrid Liede-Schumann: A molecular phylogeny and generic rearrangement of the stapelioid Ceropegieae (Apocynaceae-Asclepiadoideae). in Pl. Syst. Evol. , 234, 2002, pp. 171-209.

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