ON SOUTH-AMERICAN APOCYNACBiE, 53 



tube on a narrow pilose ring ; filaments short pilose ; anthers acuminate, biaristate at 

 the base, dorsaUy pilose ; disk cylindrical, 5-sulcate, 5-crenulate, shorter than the two 

 glabrous ovate ovaries ; style, clavuncle, and stigmata as in the generic character. 



10. BoNAFousiA POLYNEURA, n6h. : TaberruBmontana rupicola, var. Sprucei, Midll. I. c. p. 75. In Ama- 

 zonas : v. s. in hb. meo et alior. Barra do Rio Negro (Spruce 1758, sub " T. rupicoke affinis "). 



A species distinguished by its more densely foliaceous habit and its polyneurous 

 leaves. Its dichotomous branchlets are rugulose, with axils IJ- 2 in. apart ; the oblong 

 leaves, oval and suddenly acute at the base, not insequilateral, constricted into an acute 

 acumen, are dark rubescent green above, with subcrenulated numerous subpatent nerves 

 1-2 lines apart, opake and yellowish beneath, with fine nerves, scarcely prominulent, 

 3-5 in. long, lj-2 in. broad, on channelled petioles 1^ line long, transversely con- 

 joined across the axils ; raceme lateral, 1 in. long, on an angular peduncle 3 lines 

 long, supporting about 3 flowers on pedicels 2 lines long; roundish, membranaceous 

 sepals, acute, ciliated on the margins, ^ line long, with an inner trifld scale ; tube of 

 corolla cylindrical, fl^eshy, swollen below the narrow mouth, 5 lines long; segments 

 obliquely oblong, about 8 lines long, 2 lines broad, introflected and convoluted sinis- 

 trorsely in sestivation, the extremities descending into the tube ; stamens included in the 

 middle of the tube, seated on a pilose ring ; ovaries ovate, embraced at the base by a 

 short annular adnate disk ; style, clavuncle, and stigmata as in the generic character. 



11. BoNAFOUSiA RABiFLORA, nob. : TaberruBmontana rupicola, var. oHongifolia, Miill. I. c. p. 74. In 

 Amazonas : v. s. in hb. meo et alior. Barra do Rio Negro (Spruce 1005 ?) . 



A species differing from T. rupicola in its petiolated, very lanceolate leaves, almost 

 nerveless, and a different inflorescence, a more slender habit, with virgated branchlets 

 and distant internodes; the dichotomous slender branchlets are yellowish, striolated, 

 with axUs 1^-2^ in. apart ; the leaves, subcrenulate, cuneately insequilateral, with a 

 long acumen, yellowish beneath, are 4^5 in, long, 1-lJ in. broad, on very thick petioles 

 i line lono", conjoined across the axils ; the lateral raceme, on a peduncle 3 lines long, 

 has a stipuliform bract at its base, and supports 3 alternate flowers, on pedicels 4-5 lines 

 long; sepals acute, barely 1 line long; tube of corolla 4 J lines long, narrowed in the 

 mouth ; segments dolabriform, 6 lines long, 3 lines broad, simply convoluted sinistrorsely 

 in sestivation ; stamens seated on a pilose ring in the constriction of the tube ; the rest 

 as in the preceding species. 



TaBERNwEMONTANA, 



This eenus was first proposed in 1703 by Plumier in his ' Genera,' p. 18, with a short 

 character, illustrated by a drawing of its flower and fruit. He figured the plant in 1757, 

 with a more copious description of his type, under the specific name of cUrifoUa un- 

 dulata (Am. ii. 246, tab. 248 b), giving as its synonyms T. cUrifoUa lanceolata, Hort. 

 Oliff. and T.frutescem, P. Browne. Linnaeus, in his Sp. PL (1753) describes the genus 



