FLORA NIGRITIANA. 355 
urceolato cincto pilis numerosis in zonam unicam dense 
imbricatis.—Melastoma involucratum, Don, in Mem. Wern. 
Soc.—DC. Prod. 3. p. 147.—Sierra Leone. Don. 
I only find a single flower on the specimen, which is re- 
markable by the hairs or ciliz, not arranged in any distinct 
rings, but thickly collected in one broad belt surrounding the 
middle of the calyx, forming in this respect a transition to the 
hairs or scales which cover the calyx of the true Melastomas : 
the stamens, however, as far as I could judge, appear to be 
those of a Tristemma. 
In the Senegambian Flora another species is described, under 
the name of T. erectum; and Heudelot’s collection contains an 
undescribed plant belonging to the tribe of Osóeckiee, but 
scarcely referrible to any of the foregoing genera. It is a small 
ereet annual, with tetramerous flowers, resembling rather the 
American Arthrostemmas than the Asiatic Osbeckic. 
Dixornona, (gen. nov.) e tribu Rheaiearum. 
Calyz urceolato-turbinatus basi ovario adherens, apice liber 
membranaceus brevissime sinuato-dentatus. Petala 5, late 
ovata, acutiuscula. Stamina 10, conformia, antheris subros- 
tratis uniporosis, connectivo basi breviter producto postice 
leviter dilatato emarginato. Ovarium 5-loculare, apice 
nudum. Capsula membranacea, cum calyce membranaceo 
"üàturitate irregulariter disrupta? Semina numerosissima, 
placentis earnosulis affixa, cochleata, vix rugosula.— Suffrutex 
Africanus, habitu Spenneris simillimus, floribus majoribus. 
l. Dinophora spenneroides, Benth.—Fernando Po, Vogel. dide 
Caulis 3-5-pedalis, ramosissimus, basi frutescens ; rami divari- 
‘ati, herbacei, tetragoni, ad angulos pilis interdum glandu- 
losis rariter ciliati, ezeterum glabri. Folia eujusve paris paullo 
Méequalia, majora 2-4-pollicaria, ovata v. oblonga, acuta v. 
acuminata, margine ciliato-serrata, basi cordata, membranacea, 
5-7-nervia, supra strigis paucis conspersa, ceterum glabra ; 
Petiolo altero ssepe pollicari, altero dimidio breviore. Inflo- 
rescentia Spenmere. Panicula laxa, ramis gracilibus op- 
Positis laxe dichotomis, floribus. in eem v. ad 
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