Manulea, commonly known as finger phloxes, is a genus of around 72 accepted species of annual and perennial herbs and shrublets in the family Scrophulariaceae (order Lamiales). The genus was established by Carl Linnaeus in 1767 in his Mantissa Plantarum, based partly on material illustrated by Leonard Plukenet as early as 1691. Earlier authors had placed some of these plants in the related genus Selago, but Linnaeus recognised that in Manulea the corolla is more regular.
Plants in this genus branch from the base to form leafy, sometimes bushy shrublets, typically reaching 600–800 mm in height. The inflorescences are dense, crowded thyrses in a characteristic finger-like form, composed of flowers with five corolla lobes and hairy corolla tubes. Flower colours range from dull brownish-yellow to bright deep orange. Several species bear woolly or hairy foliage. The type species, Manulea cheiranthus, was among those named by Linnaeus in 1767.
Manulea is a southern African genus centred in the Cape Floristic Region of South Africa, with species extending into Namibia, Lesotho, Eswatini, Zimbabwe, Angola, Mozambique, and Botswana. Many species grow on sand dunes, coastal sands, sandy flats, and rocky slopes. Some, like M. tomentosa, are adapted to the fynbos and coastal sand habitats of the Western Cape.
The monographic treatment of Manulea as a tribe of Scrophulariaceae was published by O. M. Hilliard in 1994 (Edinburgh University Press), consolidating earlier scattered descriptions. Notable species in cultivation include Manulea tomentosa (woolly manulea), which has ornamental potential as a water-wise garden plant for sandy, coastal gardens.
Etymology
The name Manulea is derived from the Latin manus (“hand”), meaning “small hand,” in allusion to the hand-like appearance of the corolla with its five spreading lobes. This interpretation was recorded by O. M. Hilliard in her 1994 monograph of the genus and is cited by SANBI’s PlantZAfrica.
Distribution
Manulea is native to southern Africa, with the highest diversity in South Africa — particularly in the Western Cape (Cape Floristic Region) — and species recorded from Namibia, Lesotho, Eswatini, Zimbabwe, Angola, Mozambique, and Botswana. GBIF occurrence data confirm South Africa holds the vast majority of records (over 4,300 of approximately 4,900 georeferenced occurrences). Species occupy a range of habitats including coastal sand dunes, sandy flats, rocky slopes, and fynbos vegetation.
Ecology
Members of Manulea are adapted to the summer-dry, winter-rainfall climates of the Cape Floristic Region and adjacent semi-arid zones. At least some species exhibit habitat-driven plasticity: M. tomentosa grows as a compact, densely leaved plant near the coast but becomes more upright and lax on sandy flats inland. The flowers of M. tomentosa are unscented during the day but emit a slight smell at night, suggesting nocturnal pollination vectors; broader pollination biology for the genus remains poorly documented.
History
The genus was first described by Carl Linnaeus in 1767 in Mantissa Plantarum (1: 12), based in part on material Plukenet had illustrated in 1691. Early species were originally placed in Selago, before Linnaeus recognised the distinctiveness of the more regular corolla of Manulea. The definitive modern monograph — O. M. Hilliard, Manulea: a tribe of Scrophulariaceae (Edinburgh University Press, 1994) — consolidated the taxonomy of the genus and established an accepted count of approximately 72 species.
