This was later verified by molecular evidence garnered by John Manning and his colleagues in 2014. Within the genus Haworthia, three distinct subgenera: Robustipedunculares, Hexangulares and Haworthia were named, and Gordon Rowley, who realised their distinctness, created two new genera: Haworthiopsis(subgenus Hexangulares) and Tulista (subgenus Robustipedunculares). Haworthiabecame very popular among succulent enthusiasts and students, and many new species were discovered. Duval who honoured the British succulent expert, Adrian Haworth, by naming his new genus Haworthia in his work Plantae succulentae in Horto Alenconio, published in 1809. The species name attenuata means ‘narrowing to a point’ and pertains to the shape of the leaves. Haworth, in an 1812 publication, transferred his species to Duval’s newly named genus Haworthia. Haworthiopsis attenuata var attenuata was named by Adrian Haworth (1768-1833) as Aloe attenuata in Transactions of the Linnaean Society in 1804. A dense mat-forming group of the Enon haworthiopsis on a south-facing Enon Conglomerate cliff ledge at Enon near Kirkwood, and a close-up of plants in the group Derivation of name and historical aspects The accompanying species growing with Haworthiopsis attenuata var attenuata ‘Enon’ include Adromischus sphenophyllus, Anacampseros arachnoidea, Crassula cultrata, C. The associated vegetation consists of Sundays Thicket of the Albany Thicket Biome (Mucina et al. Rainfall occurs throughout the year but mostly in summer, ranging from 300–400 mm per annum (thunder showers or cyclonic winter rain). It grows on south-facing cliffs, the plants firmly rooted in crevices, their size often depending on the growing space allowed by the crevice. This cremnophilous form of Haworthiopsis attenuata is confined to the Enon Conglomerate cliffs near the town of Enon in the Eastern Cape, along the Enon River, at an altitude of about 400 m. The inflorescence and flowers of Haworthiopsis attenuata ‘Enon’, plants growing in a container. Seeds are dispersed by wind in summer and early autumn.įig. Flowering time is mainly from spring to early summer (October–November). Perianth tubular, curved, ascending-spreading, 14–18 mm long, white with purplish green midstripe. A close-up of two different clones of the Enon haworthiopsis growing in containers. Inflorescence racemose, up to 300 mm long, occasionally branched in distal half, 12–18-flowered in distal half bracts 3 mm long, clasping, ovate-acuminate pedicels 2–7 mm long.įig. Leaves firm, light to dark green, often reddish, triangular-lanceolate, 40–50 × 15–18 mm, erect at first becoming spreading and somewhat recurved under shady conditions upper side flat, convex to slightly channelled depending on moisture state, smooth or with few white, cartilaginous tubercles lower surface convex, distinctly keeled towards apex, rarely densely tuberculate tubercles cartilaginous, often in white horizontal bars margin tuberculate, tubercles about 3 mm apart apex acute, aristate. Plants dwarf-sized, rosulate, prolific from base, forming rounded clusters up to 200 mm in diameter and 70 mm high, consisting of many heads.
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