Are both Rowan and Sorghastrum native to Africa?
Rowan The rowans or mountain-ashes are shrubs or trees in the genus "Sorbus" of the rose family Rosaceae. They are native throughout the cool temperate regions of the Northern Hemisphere, with the highest species diversity in the mountains of western China and the Himalaya, where numerous apomictic microspecies occur. The name "rowan" was originally applied to the species "Sorbus aucuparia" and is also used for other species in the "Sorbus" subgenus "Sorbus". Rowans are unrelated to the true ash trees, which belong to the genus "Fraxinus", family Oleaceae, though their leaves are superficially similar.
Salvia disermas Salvia disermas is a herbaceous perennial shrub native to South Africa (the Cape Provinces, the Free State and the Northern Provinces), found in streambeds, moist forest, grassland, and disturbed ground. It was originally specified as "rugosa", but was changed to "disermas". It grows throughout west Africa, with its greatest concentration in South Africa, where it is used medicinally as a tea, and as a lotion for treating sores.