204 FLORA NIGRITIANA. 
floribus tria, quorum duo semper abortiri videntur. Ovula 
pauca. T, Senegalensi proxima, differt ramis foliisque subter 
asperis, floribus minoribus, sepalisque rotundatis et pubes- 
'eentibus. 5 
In the presence of several species of Tetracera, Tropical 
Western Africa partakes of the botanical features both of the 
east coast of South America and Intertropical Asia. The species 
are confined to the hottest, dampest and most shaded forests of 
all these regions. All of the African species are more nearly 
allied to those of the New than of the Old World. 
2. Tetracera Senegalensis, DC. Prodr. v. 1. p. 68. Guill. et 
Perr. Fl. Seneg. p. 2.—T. obovata, DC. et Guill. et Perr. 
l. c.—Senegambia, Sierra Leone and the Bight of Benin, 
Afzelius, Don, &c. 
Apparently a very common species north of the Equator, but 
not occurring in the collections of the Niger Expedition. 
3. Tetracera alnifolia, Willd. ; DC. Prodr. v. 1. p. 68.—Sene- 
gambia, Sierra Leone and Guinea, Smeathman, Afzelius, 
Don, &c. : 
The only other species of this order known as W. African, 1S 
T. rugosa, Guill. and Perr., a name unnecessarily changed by 
Steudel to T. Guillemini, on the supposition that there was 
already a T. rugosa, H.B.K., which we cannot find to have been 
anywhere described. 
III. ANONACEJX. 
l. Anona muricata, Linn. (Sour-sop).— Sierra Leone (cult.), 
Vogel. 
2. Anona squamosa, Linn. (Sweet-sop).—Sierra Leone (cult.), 
Vogel. 
A plant now equally and universally diffused over the tropics of 
both the New and Old World, and to which St. Hilaire, with some 
shew of probability, assigns the E. Indies as its native place» 
It is particularly abundant about Portuguese colonies, and its 
Brazilian name of “ Ata” is considered by that author as all 
but conclusive in favour of its Asiatic origin. On the other 
