rimin agwada, Sopubia simplex, Hochst. and other spp. (Scrophularineæ). An erect herb in the bush with narrow leaves and pink flowers. (agwada = Rock dassie, Procavia sp.).
rimin samari, Oldenlandia grandiflora, Hiern. (Rubiaceæ). A common slender-branched herb of fields and waste places, with bright red 4-partite flowers. Also O. senegalensis, Hiern. a similar plant with smaller less conspicuous flowers. Used as a love-potion or charm for popularity.
rimni (Sok.), Salix sp. (Salicaceæ). A common species of willow on river-banks. Syn. [ba ruwana], q.v.
risga, a cultivated plant with an edible tuber. Plectranthus sp. (Labiatæ); like the “Kaffir Potato,” P. esculentus, N.E. Br.
risgar kurege, Asclepias lineolata, Schl. (Asclepiadeæ). A shrub with milky juice and umbels of purple flowers; the spindle-shaped root tubers are used medicinally.
roba, Panicum pyramidale, Lam. (Gramineæ). A tall grass of marshy places; (probably applied to several grasses).
rogo, Manihot palmata, Muell. Arg. (Euphorbiaceæ). Sweet Cassava or Manioc; and Manihot utilissima, Pohl. Bitter Cassava. The former or non-poisonous species is the one chiefly cultivated in Nigeria, cf. [ḳarasa]. rogon sabara or r. magariya (Sok.) are terms used for Cassava grown in arid areas ([sabara] and [magariya], q.v. being shrubs of dry scrub districts).
rogon biri, vide [ḳosain rogo].
rogon daji, a species of vine with thickened roots; vide [tsibiri kinkini]; (also applied to other twiners with thickened roots, e.g. a wild species of yam, Dioscorea sp., a species of Clematis, &c.).
rojiya or lojiya, a perennial herb (Asclepiadeæ), with long narrow leaves milky juice and an edible succulent tuberous root-stock. rojiyar mahalba, Xysmalobium Heudelotianum, Decne (Asclepiadeæ); a somewhat similar plant with milky juice, short leaves, lateral umbels of small flowers, and a harder tuberous root edible when cooked. (The names bauje, saniya and daiyo, probably refer to the same or allied Asclepiad plants or “Milkweeds,” with tuberous roots, e.g. Schizoglossum Petherickianum, Oliv. which has short broad leaves and umbels of white flowers).