Thinouia Triana & Planchon

Thinouia Triana & Planchon, Ann. Sci. Nat. Bot. Ser. 4, 18: 368. 1862 Carpidiopterix H. Karsten, Fl. Columb. 2: 45. 1863. Type: Carpidiopterix macroptera (Cassar.) H. Karst. = Thinouia scandens (Cambess.) Trian. & Planch. Allosanthus Radlk. in A. Engler., Pflanzenr. IV. 165. (Heft 98): 1157. 1933. Type: Allosanthus trifoliolatus Radlk. = Thinouia trifoliolata (Radlk.) Acev.-Rodr. & Ferrucci Type. Thinouia myriantha Triana & Planchon. Description. Lianas or seldom shrubs with arched branches; climbing with the aid of a pair of circinate tendrils that are proximal to the floriferous part of the inflorescence and homologous to a cincinnus. Stems terete or ribbed, lenticellate; cross-sections of branches and young stems simple, i. e., with single vascular cylinders, some species developing a compound stem where 1–5 (7–8) vascular cylinders are formed within the cortex, these becoming wider as the stem grows wider. Stipules minute, axillary, deltate to lanceolate, early deciduous. Leaves alternate, trifoliolate; petioles and petiolules unwinged. Inflorescences of umbelliform or racemiform thyrses, often bearing a pair of tendrils at the base of the rachis, axillary or forming a frondobracteate synflorescence on distal portion of branches, rarely cauliflorous, peduncle and secondary peduncle, sometimes sessiles; flowers produced in cincinni; pedicels articulated. Flowers actinomorphic; calyx cup-shaped, partly connate, sepals 5, valvate, of equal size; petals 5, obovate to spatulate, with a pair of short appendages, smaller or equal than the petals or longer than the petals, sometime clawed; disc extrastaminal, annular, rarely 5 - lobed; stamens 6–8, filaments equal or in two unequal series, anthers dorsifixed; pollen isopolar, obtusely triangular in polar view, subspherical in equatorial view, tricolporate, with elongated colpi nearly reaching the poles, striate; ovary 3 - carpellate, the ovules solitary with axile placentation; style elongated with 3 papillose stigmatic branches. Fruit schizocarpic, stipitate, splitting into 3 mericarps, each with a distal wing, the seed locus subglobose, lenticular or rarely flattened; seed trigonous-ellipsoid, or lenticular-ellipsoid, exarillate, with a small hilum.