70 FLORA NIGRITIANA. 
the corolla is all but identical, so is the structure of the calyx. 
The styles in the American plant are more deeply separated than 
in the African one, but Choisy considers that a variable cha- 
racter. The ovary of Prevostea is described as bilocular, but 
the figure represents the dissepiment as incomplete, precisely as 
it is in Don’s plant. I have restored Don’s specific name, for 
although it be not attached to the specimen, the memoranda on 
the label leave no doubt but that this is the plant he had in 
view; and the mistake as to the “opposite leaves,” must have 
arisen from his having noted that it is either Gentianeous Or 
Asclepiadeous. 
Prare XLVI. Fig. 1. unopened corolla; f. 2. flower; f. 9. co- 
rolla opened laterally, showing the stamens ; f. 4. ovary and 
styles; f. 5. section of the ovary ; all magnified. ' 
There is another unpublished species of the same genus, m 
Heudelot’s Senegambian collection, with the inflorescence rather 
more developed than in Don’s plant. ? 
l. Breweria secunda, Benth.; volubilis, foliis ovato-lanceolatis 
oblongisve acuminatis retusisye subcoriaceis supra glabris a 
parce pilosis subtus ferrugineo-villosis, cymis densis multi- 
floris axillaribus peduneulatis v. ad apices ramorum subsessili- 
bus confertis, sepalis acutis rufo-sericeis corolla pilosa dimidio 
brevioribus, capsula globosa apice puberula, seminibus gla- 
bris.—Ipomeea secunda, G. Don, Gard. Dict. 4. p. 282.— 
Sierra Leone, Don. ; 
Caulis glaber v. ferrugineo-pubescens. Folia breviter petiglata, 
basi obtusa, nune 2-3-pollicaria elliptico-oblonga et obtusis- 
sima, nunc 1}-pollicaria ovato-lanceolata et apice longiuseule 
aeutata, summo tamen apice semper obtusa cum mucrone. 
Cyme alie axillares distantes, aliæ ad apices ramulorum 1m 
cymam v. fasciculum subsecundum  densissime confert. 
Sepala 3-4 lin. longa, ovato-lanceolata, parum ineequalia. 
Corolla campanulata (ex Don alba). Stylus ad tertiam 
partem fissus, stigmatibus majusculis capitatis. Ovarium 
apice pilosum. Capsula calyce brevior. 
1. Evolvulus alsinoides, Linn.— CAois. in DC. Prod. 9. p. 447 
