Disphyma

Plants in the genus Disphyma are prostrate, annual plants or short-lived perennials with branches that root at nodes. The leaves are arranged alternately and fused at the base, succulent and round to more or less triangular in cross-section. The flowers are usually arranged singly, sometimes in pairs or three, on the ends of branches or on short side shoots, each flower on a pedicel up to 100 mm (3.9 in) long. The perianth is tube-shaped with five sepals, two larger and leaf-like and three smaller, slightly succulent and not leaf-like. There are many petal-like, purplish staminodes in two rows and many stamens in four or five rows. The ovary is inferior and there are usually five styles. The fruit is a capsule.[1][2]

The genus Disphyma was first formally described in 1925 by N. E. Brown in The Gardeners' Chronicle.[3][4]

As at October 2020, Plants of the World Online accepts four species:

• Disphyma australe (Sol. ex Aiton) J.M.Black that is endemic to New Zealand;[5]
• Disphyma crassifolium (L.) L.Bolus that is native to Australia and the Cape Province in southern Africa;[6]
• Disphyma dunsdonii L.Bolus that is endemic to the Cape Province;[7]
• Disphyma papillatum Chinnock that is endemic to the Chatham Islands on New Zealand;[8]

Plants of the World Online also accepts two subspecies:

• Disphyma australe subsp. stricticaule Chinnock that is endemic to Kermadec Island of New Zealand;[9]
• Disphyma crassifolium subsp. clavellatum (Haw.) Chinnock that is endemic to Australia and has been introduced to the South Island of New Zealand.[10]