Monographs Details: Abuta convexa (Vell.) Diels
Authority: Barneby, Rupert C. & Krukoff, Boris A. 1971. Supplementary notes on American Menispermaceae. VIII. A generic survey of the American Tricilisisae and Anomospermeae. Mem. New York Bot. Gard. 22: 1-89.
Family:Menispermaceae
Description:Distribution and Ecology - Distribution (51 collections): appears to be confined to southeastern Brazil (Minas Gerais) (most of collections are from Vigosa), Espirito Santo (all collections are from the basin of Rio Doce), and Rio de Janeiro and Guanabara. BRAZIL. J. G. Kuhlmann 455 (RB), James Bowie s n (BM), Bowie & Cunningham s n (BM), s n (BM), s n (BM), Casaretto 1855 (G, F-photo 27509), Clausen 39 (BM, P), Regnell s n (S), F. Sellow s n (1815/1817) (BM), Herb. Ventenat s n (G), Widgren 1318 (BR); IMinas Gerais: J. G. Kuhlmann s n (Sep 1935) (RB) (Vigosa), Mexia 4215, 5478, Luiz Emygdio 1302 (R) (Vigosa), Herb. Vigosa 2116 (VIC) (Vigosa), Esc. Sup. Agr. & Vet. 1630; Espirito Santo: basin of Rio Doce, OVB-6, OVB-20, OVB-45, OVB-46, OVB-51, OVB-55, OVB-74; Rio de Janeiro and Guanabara: Andersson s n (S), BurcheU 891 (P-isotype), Carmichael 1382 (G), Alex Frey s n (1852) (BM), Herb. Gardner 5352 (BM) (Corcovado), Glaziou 2918 (F), 3860 (F, K, P, R), 5725 (P), 7869 (P), Guillemin 639 (G, P-isotypes of Cocculus macrophylla), s n (P) (Corcovado), Langsdorff s n (US), Martius 306 (F-photo 19129), Miers 3881 (K-cotype of A. heterophylla), Mikan s n (F), Nadeau s n (P) (Corcovado), A. J. de Sampaio 8238 (R), Widgren 542 (BR), s n (S), Jard. Bot. Rio 16227 (RB), 79116 (RB) (Maia Jardim), Mus. Nac. Rio 25097 (Schwacke) sn (R), 45400 (R), 45413 (Mendanha) s n (R), Herb. Schwacke 1516 (RB), 5673 (RB) coll. undcsign. (B]M-cotype of .A. heterophylla) (Morão Flamengo).

Discussion:

Cissampelos convexa Velloso, Fl. Flum. Ic. 10: pl. 142. 1827.

Cissampelos tomentosa Velloso, Fl. Flum. Ic. 10: pl. 143. 1827.

Cocculus macrophylla A. St. Hilaire & Tul., Ann. Sci. Nat. II. 17: 134. 1842.

Cocculus martii A. St. Hilaire & Tul., Ann. Sci. Nat. II. 17: 35. 1842.

Abuta heterophylla Miers, Ann. Mag. Nat. Hist. III. 14: 258. 1864.

Abuta macrophylla Miers, Ann. Mag. Nat. Hist. III. 14: 258. 1864.

Cocculus tomentosa Martius; Eichler in Martius, Fl. Bras. 13(1): 175, synonym. 1864. Not Cocculus tomentosiis Colebrooke, 1822.

Cissampelos abutua Velloso, Fl. Flum. Ic. 10: pl. 140. 1827, fide Miers, Contr. Bot. 3: 86. 1871.

Inasmuch as Abuta convexa has been reinstated as a valid species we decided to cite here all known collections of it.

Mature fruits of this species are not known.

The report on tests of extracts of stems and roots for insecticide activity given in Mem. N. Y. Bot. Gard. 20(2): 15 refer to this species rather than to Abuta rufescens [Esc. Sup. Agr. & Vet. 1630 (Krukoff Herb. 17733)].

As indicated by the synonymy cited, our present concept of A. convexa covers all abutas of the rufescens type found on the southeast margins of the Brazilian central plateau. It thus bears to its close Amazonian relatives A. splendida and A. rufescens much the same relation that A. selloana does to A. imene. Diels [Pflanzenreich 4(94): 193] was the first modern botanist to separate an A. convexa from A. rufescens, but he defined his entity on a fallacious character of the leaves. In the immediate environs of Rio de Janeiro, where A. convexa is common, the leaf-blades vary from cordate, with a variably deep basal sinus, to obovate, with a broadly cuneate base, and it was this latter type of leaf which formed the basis for A. convexa of Diels. In the monograph (Brittonia 3: 67) the untenable nature of this differential character was exposed, and the broad concept of Eichler, as formulated in Flora Brasillensis, was readopted. Returning now to the idea of a separate A. convexa, we distinguish it both from A. rufescens and from A. splendida, of which it has almost the staminate flower and androecium, by its finely reticulate upper leaf-surface, and further from A. splendida by its relatively thin brownish pubescence. From J. pahni, also Amazonian and also with leaves reticulate above, it is further removed by its entirely different staminate perianth and androecium (cf. figs.) and the looser, denser pubescence of the blades.

For tests of extracts of stems and roots (Krukoff Herb. 17733) for insecticidal activity, see Ralph E. Heal et al., A survey of plants for insecticidal activity, Lloydia 13: 89-162. 1950.

Distribution:Brazil South America|