Haworthia venosa

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Haworthia venosa
01 20120515ortopallavicini-269.JPG
Haworthia venosa var. tessellata at the botanical garden of Villa Durazzo-Pallavicini, Genova Pegli
Scientific classification e
Kingdom: Plantae
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Xanthorrhoeaceae
Subfamily: Asphodeloideae
Genus: Haworthia
Species: H. venosa
Binomial name
Haworthia venosa
(Haw.) Haw.
Synonyms

Haworthia venosa is a species of flowering plant in the genus Haworthia belonging to the family Xanthorrhoeaceae, native to Namibia and South Africa.

Naming and taxonomy[edit]

The genus name Haworthia honors the British botanist Adrian Hardy Haworth (1767–1833), while the species name venosa means "veined”.[1]

Within the genus Haworthia, the species forms part of the subgenus Hexangulares. More specifically, it falls within section Venosae (together with its close relatives, Haworthia limifolia, Haworthia koelmaniorum and Haworthia woolleyi).

Recent phylogenetic studies have demonstrated that subgenus Hexangulares is actually relatively unrelated to other Haworthias (being more closely related to Gasterias. It will therefore comprise a new, separate genus, Haworthiopsis, and this species will accordingly become "Haworthiopsis venosa".[2][3]

Description[edit]

It is a mat-forming succulent evergreen perennial reaching 8–60 cm (3–24 in) in height. Stemless rosettes of 12-15 fleshy, triangular, lanceolate, dark green leaves show a few pale green lines along the upper surfaces and small teeth along the margins.

In spring (November to December) it bears 15 cm (6 in) long stems of green-white, tubular flowers in racemes.[4]

Distribution[edit]

This species occurs over a large area, from the inland Karoo and Namibia to as far south as the norther part of the Breede River valley. Here it occurs on rocky slopes.

Cultivation[edit]

In cultivation it requires a minimum temperature of 10 °C (50 °F), so is grown under glass in temperate locations.[5]

Subspecies[edit]

  • H. venosa subsp. granulata (Marloth) M.B.Bayer
  • H. venosa subsp. tessellata (Haw.) M.B.Bayer
  • H. venosa subsp. venosa
  • H. venosa subsp. woolleyi (Poelln.) Halda

H. venosa subsp. tessellata has gained the Royal Horticultural Society's Award of Garden Merit.[6]

References[edit]

  1. ^ Harrison, Lorraine (2012). RHS Latin for gardeners. United Kingdom: Mitchell Beazley. p. 224. ISBN 9781845337315. 
  2. ^ Manning, John; Boatwright, James S.; Daru, Barnabas H.; Maurin, Olivier; van der Bank, Michelle. A Molecular Phylogeny and Generic Classification of Asphodelaceae subfamily Alooideae: A Final Resolution of the Prickly Issue of Polyphyly in the Alooids? Systematic Botany, Volume 39, Number 1, March 2014, pp. 55-74
  3. ^ http://www.haworthia.org.uk/haworthia.htm
  4. ^ RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 1405332964. 
  5. ^ Haworthia venosa - Information page at Haworthia-Gasteria
  6. ^ "RHS Plant Selector - Haworthia venosa subsp. tessellata". Retrieved 17 July 2013.