Monographs Details: Sipanea biflora (L.f.) Cham. & Schltdl.
Authority: Maguire, Bassett. 1967. The botany of the Guayana Highland--Part VII. Mem. New York Bot. Gard. 17: 1-439.
Family:Rubiaceae
Description:Distribution and Ecology - The Guianas, eastern Venezuela, and northern Brazil. FRENCH GUIANA. Region organabo Mans, Halle 504. BRITISH GUIANA. Demerara, Jenman 4096. VENEZUELA. Bolivar: Alto Rio Chirca, region de Uriman, Bernarcli 950; base of Cerro Pauji along Quebrada 94 at Km 94 S of El Dorado, Steyermark 86718; 32 km E of El Palmar, Steyermark 86259; Delta Amacuro: Salto de Quebradero, upstream from San Victor, Rio Amacuro, Sierra Imataca, Ven.-Brit. Guianan frontier, Steyermark 87252. BRAZIL. Cruz de Casma, Prov. Soderopolitana, Martins 594; Alapuera Camp, Riverside, Acarai Mts., Forestry Dept. Field No. G 495; Rio Oiapoque, about 1-3 km N of Cachoeira Tres Saltos, 2°12-13'N, 52°52-53'W, Amapa, Irwin, Pires & Westra 48214

Discussion:

Virecta biflora L. f., Suppl. 134. 1781.

Type. Suriname, Dalbcrg.

he specimens I have identified as Sipanea biflora have the capsules or hypan-thia very sparsely pubescent with remote appressed hairs in the upper half only or from base to apex. Although Linnaeus filius does not mention the glabrosity of the leaves in his original description, he does refer to the occurrence of the white hairs of the orifice of the corolla as “corollae rubescentes: ore albo.”

Sipanea radicans Endl. (Atakt. Bot. 7; t. 7. 1833) is usually cited as a synonym of S. biflora. It is based on a specimen of Blanchet from Bahia, Brazil. The leaves of S. radicans are described as “glabriusculis,” but the accompanying plate 7 shows leaves densely hairy on both sides. The plate, likewise, shows the capsule as densely pubescent and the description states “extus pilis brevius adpressis eonspersis.” Likewise, Rottboll’s description of Rondeletia biflora (Descr. Pl. Quar. Surinam. 8. 1798) includes elements discordant with the specimens treated here in the present study. Rottboll describes the stems as “hirsutus, sordide cinereus,” the leaves as “hirsuta,” and the perianth as “hirsutum,” while the plants identified in the present study as S. biflora have stems generally merely sparsely and shortly appressed-pilosulous, the leaves mainly glabrous or remotely short-strigillose above and glabrous below except the inconspicuously short strigillose midrib and lateral nerves, and the perianth (so far as the corolla is concerned) glabrous on the tube without except for a few short appressed hairs above and completely glabrous on the lobes, calyx lobes glabrous except for a few ciliolate hairs, and the hypanthium sparsely apprcssed-pubescent in the upper half. Despite Rottboll’s contradictory statements concerning the pubescence on the above parts, his accompanying illustration (Deser. Pl. Quar. Surinam, t. II, f. 2) does not show any pubescence on the parts mentioned.

Until the type material of Sipanea radicans and Rondeletia bicolor have been studied and compared with Dalberg’s original collection of Virecta biflora, it is not possible to be certain that all three names refer to the same taxon.

Distribution:French Guiana South America| Guyana South America| Venezuela South America| Brazil South America|