Question: Which plant is native to Namibia, Fenestraria, Rohdea or both?
Context: Rohdea is a genus of native to eastern Asia (China, Japan, the Himalayas and Indochina).  It was long thought to contain only a single species, "R. japonica", but recent studies have resulted in several other taxa being transferred into the genus. Fockea edulis is a species of plant in the Apocynaceae family that is native to South Africa and Namibia.  A common name is Hottentot bread due to the milky, somewhat sweetish flavour of the edible root which is sometimes gathered from the wild for local use.  The plant's latex is said to be poisonous.  In Afrikaans the plant is called Bergbaroe, Bergkambroo, Kambaroo, Kambroo, Kambro, or Hotnotswaatlemoen.  In Khoi it is called ! Koo, ! Ku, or ! Kuu.  A semi-deciduous perennial caudiciform with fat, twisted grey roots, it grows in warmer drier areas, dry savannah and rockery.  In the wild, the caudex is partially or totally buried and tends to grow faster this way up to 60 cm in diameter.  Fockeas are dioecious, so a male plant and a female plant are needed to produce seeds.  The flowers are whitish-green, not very showy but lightly scented, small (0.6-1.5 cm wide) vygie-like flowers surrounded by a large, thick, spider-like calyx.  The flowers are pollinated by fruit flies.  The plant produces grey-greenish pods.  The thin vine branches may reach a length of up to 4 meters, and climb on any type of available support.  The leaves are green, entire and oblong.  Although it shows decreased activity in the January – April period, it never goes into complete dormancy and always carries some leaves.  Plants cannot tolerate more than occasional light frosts with temperatures dropping as low as -2°C.  This species is of easy cultivation and hardy when kept reasonably dry and watered only enough to keep the tuber from shriveling. Crassula muscosa (Linnaeus, 1760), also named Crassula lycopodioides (Lamarck) or Crassula pseudolycopodioides, is a succulent plant native to South Africa and Namibia, belonging to the family of "Crassulaceae" and to the genus "Crassula".  It is a houseplant grown worldwide and commonly known as Rattail Crassula, Watch Chain, Lizard's Tail, Zipper Plant and Princess Pine. Cleome maculata is a species of cleome that is native to southern Africa, where it occurs in sandy soils, especially in rocky habitats, and on slopes.  It is a mostly annual plant, which is found in highveld regions of medium rainfall in South Africa, Botswana and Namibia.  It is an erect and simple or branching plant, usually less than a foot tall, with sparse leaves.  The linear leaflets are three to five compound.  Two of the up-curved, mauve flower petals have a yellow mark at their center, which is bordered with dark purple.  The long, up-curved stamens are tipped with bluish, knobby anthers.  The fruit is a linear capsule.  The species is a pioneer plant that may become a weed. Hoodia currorii is a succulent plant native to Namibia and the Cape Province of South Africa.  It grows in desert areas and is common along the road from Karibib to Swakopmund in Namibia.  It is also known as Ghaap in the vernacular. Hoodia macrantha is a succulent plant native to Namibia and the Cape Province of South Africa.  It is regarded by some sources as a synonym of the accepted name for the plant, "Hoodia currorii" subsp.  "currorii". Lithops karasmontana (Karas Mountains living stone) is a species of flowering plant in the ice plant family Aizoaceae, native to Namibia and South Africa (the name refers to the Great Karas Mountains of Namibia). Rohdea japonica is a species of plant native to Japan, China and Korea.  Common names include Nippon lily, sacred lily, and Japanese sacred lily. Fenestraria (known as babies' toes or window plant) is a (possibly monotypic) genus of succulent plants in the family Aizoaceae, native to the Namaqualand in Namibia. Salvia namaensis is an evergreen perennial shrub native to a limited area in Namibia and a wide area of South Africa (the Cape Provinces and the Free State).  It is typically found growing on rocky slopes, shales, limestone hills, and sandy soils at 1,000 to 5,000 feet elevation.  The specific epithet "namaensis" probably refers to the Nama tribe which is indigenous to Namaqualand, the region in Namibia where the plant grows.
Answer: Fenestraria