Question: Are both Rowan and Sorghastrum native to Africa?
Context: Rowan Oak, also known as William Faulkner House, is William Faulkner's former home in Oxford, Mississippi.  It is a primitive Greek Revival house built in the 1840s by Robert Sheegog.  Faulkner purchased the house when it was in disrepair in the 1930s and did many of the renovations himself.  Other renovations were done in the 1950s.  The house sits on 4 landscaped and twenty nine acres of largely wooded property known as Bailey's Woods.  One of its more famous features is the outline of Faulkner's Pulitzer Prize–winning novel "A Fable", penciled in graphite and red on the plaster wall of his study.  Though the "rowan oak" is a mythical tree, the grounds and surrounding woods of Rowan Oak contain hundreds of species of native Mississippi plants, most of which date back to antebellum times.  The alley of cedars that lines the driveway was common in the 19th century.  The studs of the house are 4"x4" square cypress, which were hand-hewn.  Faulkner drew much inspiration for his treatment of multi-layered Time from Rowan Oak, where past and future seemed to inhabit the present. Sorbus pseudomeinichii, known as false rowan and Catacol whitebeam, is a rare tree endemic to the Isle of Arran in south west Scotland.  It is believed to have arisen as a hybrid of the native rowan ("Sorbus aucuparia") and the cut-leaved whitebeam ("Sorbus pseudofennica") which is in turn a rowan/Arran whitebeam ("Sorbus arranensis") hybrid.  Only two specimens of the Catacol whitebeam are known, making it the rarest tree in Scotland and also the United Kingdom.  A third was recorded as a sapling but is believed to have been destroyed by deer.  A seedling has also been grown in Edinburgh. Sorbus aucuparia, commonly called rowan and mountain-ash, is a species of deciduous tree or shrub in the rose family.  It is a highly variable species, and botanists have used different definitions of the species to include or exclude trees native to certain areas; a recent definition includes trees native to most of Europe and parts of Asia, as well as northern Africa.  The range extends from Madeira and Iceland to Russia and northern China.  Unlike many plants with similar distributions, it is not native to Japan. Sorbus hupehensis (Hupeh rowan or Hubei rowan; ) is a species of rowan native to central and western China (between Qinghai and Gansu in the west, Yunnan in the south, Jiangxi in the southeast, and Shandong in the east). Sorbus glabrescens (white-fruited rowan) is a species of rowan native to Yunnan in China. Sorghastrum is a genus of grasses, native to Africa and the Americas. 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. Barry Rowan (born 24 April 1942) is an English former professional footballer who played as a Winger .  He played for a variety of clubs in a number of countries, most notably Millwall and Exeter City in The Football League in England, also including short spells with Brentford, Colchester United, Reading and Plymouth Argyle.  Rowan also played abroad in America for Oakland Clippers and Detroit Cougars and in South Africa for Durban United. Schizachyrium scoparium, commonly known as little bluestem or beard grass, is a North American prairie grass native to most of the United States, except California, Nevada, and Oregon, and a small area north of the Canada–US border.  Its greatest manifestation has always been in the Midwestern prairies.  Little bluestem is a perennial bunchgrass and is prominent in tallgrass prairie, along with big bluestem ("Andropogon gerardi"), indiangrass ("Sorghastrum nutans") and switchgrass ("Panicum virgatum").  It is a warm-season species, meaning it employs the C photosynthetic pathway. Sorghastrum secundum is a species of grass known by the common name lopsided Indiangrass.  It is native to the southeastern United States.
Answer: no