The first recognised published description of Heliophila appears in the second edition of Species Plantarum by Carl Linnaeus, printed in 1763. He attributes his description, however, to Nicolaas Laurens Burman, a Dutch botanist.[2] The generic nameHeliophila is Latin but originally derived from the Ancient Greek words hēlios (ἥλιος), meaning "sun", and phílos (φίλος), meaning "dear" or "beloved", and refers to the blooms opening in sun and closing at night or in overcast conditions, a habit of many of the species within the genus.[1][2]
In general, contention abounds regarding phylogenetic relationships in the family Brassicaceae. In the past, using morphological characters to establish tribes and genera was misleading and created dissension among systematists. The classification of species within Brassicaceae is gradually resolving through molecular phylogeny investigation, using internal transcribed spacer (ITS) data and other new-found sequencing knowledge.[3][4]
Previously there were six genera within the tribe Heliophileae, all endemic to southern Africa: Heliophila, Cycloptychis, Schlechteri, Silicularia, Thlaspeocarpa, and Brachycarpaea. The latter five genera contained among them only seven species, having been differentiated from the genus Heliophila mainly on morphological differences in the fruits they bore. Following extensive analysis of molecular evidence (nuclear (ITS) and plastid (trnL-F) DNA sequence data), Heliophileae was found to be monophyletic and the five small genera were reduced to synonymy with Heliophila.[1][3][4]
Distribution
Heliophila is one of only two genera of Brassicaceae endemic to southern Africa. The majority of the species grow in the winter-rainfall Cape Floristic Region and the more arid Namaqualand, while a smaller portion extend to the rest of South Africa, Namibia, Eswatini, and Lesotho. None of the members of this genus are listed on the IUCN Red List of Threatened Species.[1][3][4][5]
Description and habit
Heliophila is regarded as one of the most diverse genera in the family Brassicaceae. Flower size, for example, varies greatly, with this genus containing both the largest of petals within the family (H. juncea) to the smallest (H. pectinata). There is a range of flower colour, with blue, white, and pink being the most common. Blue is an unusual colour for Brassicaceae, being known in only one other genus, the unrelated Solms-laubachia from the Himalayas.[1][3][4][5]
Within the genus are mainly herbs and subshrubs, although shrubs and lianas appear as well. They may be annual or perennial and the majority of the fruits produced by species in this genus are dehiscent, not woody, and lack a carpophore. The plants are generally either glabrous or possess simple hairs. Leaves are variable; they are narrow or broad, but usually simple, and may be entire, lobed, or pinnatipartite. The inflorescences are usually the raceme type.[1][3][4][5]
Agathosma is a genus of about 140 species of flowering plants in the family Rutaceae, native to the southern part of Africa. Common names include buchu, boegoe, bucco, bookoo and diosma. Buchu formally denotes two herbal species, prized for their fragrance and medicinal use despite their toxicity. In colloquial use however, the term is applied to a wider set of fragrant shrubs or substitutes.
Lotononis is a genus of flowering plants in the family Fabaceae and the tribe Crotalarieae. The genus includes 99 species of annual and perennial herbs, native to the southeastern Europe and Turkey, eastern Africa, and southern Africa.
Phylica is a genus of plants in the family Rhamnaceae. It contains about 150 species, the majority of which are restricted to South Africa, where they form part of the fynbos. A few species occur in other parts of southern Africa, and on islands including Madagascar, the Mascarene Islands, Île Amsterdam, Saint Helena, Tristan da Cunha, and Gough Island. The oldest fossils of the genus are of Phylica piloburmensis from the Burmese amber of Myanmar, dating to around 99 million years ago during the mid-Cretaceous.
1 2 3 4 5 Mummenhoff, Klaus; Al-Shehbaz, Ihsan A.; Bakker, Freek T.; H. Peter, Linder; Mühlhausen, Andreas (October 2005). "Phylogeny, morphological evolution, and speciation of endemic Brassicaceae genera in the Cape Flora of southern Africa". Annals of the Missouri Botanical Garden. Missouri Botanical Garden Press. 92 (3): 400–424. JSTOR40035479.
1 2 3 4 5 Al-Shehbaz, Ihsan A.; Mummenhoff, Klaus (September 2005). "Transfer of the south African genera Brachycarpaea, Cycloptychis, Schlechteria, Silicularia, and Thlaspeocarpa to Heliophila (Brassicaceae)". Novon. Missouri Botanical Garden Press. 15 (3): 385–389. JSTOR3393479.
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