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Haworthia is a large genus of small succulent plants endemic to Southern Africa (Mozambique, Namibia, Lesotho, Eswatini and South Africa). [1]Like aloes and gasteria they are members of the subfamily Asphodeloideae and they generally resemble miniature aloes, except in their flowers, which are distinctive in appearance.
The genus Haworthia was long considered problematic, and suspected of being polyphyletic. It was accordingly divided into three different subgenera: Haworthia (the soft, green, leafy, and often retuse species); Hexangulares (the harder, often tubercled species); Robustipedunculares (the four largest, most robust species).
It was formerly classed in the genus Haworthia, with the other large species (T. pumila, T. minima and T. marginata) in the "Robustipedunculares" subgenus. Following recent phylogenetic studies, it has been shown that these four species in fact constitute a distinct out-group, separate from other Haworthias.
Haworthia pubescens is a critically endangered perennial succulent belonging to the family Asphodelaceae. It is endemic to the fynbos region of the Western Cape and is found in Worcester . The plant has an occurrence area of less than 10 km 2 and there is one subpopulation that is threatened by succulent poaching, infrastructure development for ...
Haworthiopsis coarctata, formerly Haworthia coarctata, is a species of flowering succulent plant from the Eastern Cape Province, South Africa and naturalized in Mexico. It is one of the species of Haworthiopsis that is commonly cultivated as an ornamental.
In some old records it is also occasionally listed as Haworthia margaritifera. [ 2 ] [ 3 ] It is the largest of the Tulista species (reaching up to 30 cm in height), and is classed with the other large species ( T. marginata , T. minima and T. kingiana ) in the " Robustipedunculares " subgenus.
The latter is a later homonym of Haworthia minor, and in 2018 the correct combination, Tulista minor, was published. [1] [4] The epithet "minor" means "small" as it is not as large as its closest relatives, such as Tulista pumila. In some old records it is also occasionally classed as Haworthia margaritifera.
In this form, it is similar to other retuse haworthias (e.g. Haworthia retusa, Haworthia bayeri, Haworthia springbokvlakensis, Haworthia pygmaea, Haworthia mirabilis and Haworthia magnifica). A distinctive feature is the convex shape of the leaf faces. The faces appear to bulge upwards, with the leaf tips bent back downwards.