SOUTH AMERICAN BOTANY. 349 
lower portion being always densely tomentose, while the upper 
half is glabrous: in Cleochroma, on the contrary, the filaments 
are very thin, dilated, and membranaceous, especially the lower 
moiety, which is quite glabrous, or only sometimes slightly 
pubescent on the margins: their insertion is near the base in 
lochroma, while in Cleochroma, although adnate below, they be- 
come free only a little below the middle of the tube of the corolla, 
which is pubescent thence to the base, while the filaments remain 
more or less glabrous. Even in the dried specimen, the remains 
of the thin annular dise surrounding the base of the ovarium may 
be seen in Jochroma, but I have not been able to distinguish it in 
that of Cleochroma. In Cleochroma the berry is larger, the seeds 
being apparently imbedded in a greater quantity of pulp, the 
embryo is less curved, and the cotyledons much shorter in pro- 
portion, forming even less than one third of its whole length, 
while in Zochroma, they are equal in length to the radicle. In 
the seeds of Zockroma and Chenesthes, the hilum is seen laterally 
in the sinus of the margin, where it is scarcely distinguishable by 
any particular mark, but in Cleochroma macrocalyz, I have noticed, 
in every instance, that the hilum is distinctly perforated through 
the testa, which is of thinner texture than in the seeds of Jochroma. 
CrEocHROMA, gen. nov.—Calyx tubulosus, medio ventricosus, 
ore subconstrictus, inæqualiter 5-dentatus, reticulatus, persistens, 
et sæpius augescens. Corolla tubulosa, tubo medio subdilatato, 
calyce 2-plo, rarius 6-plo longiore, limbo conspicuo, campanulato, 
5-partito, lobis acutis, æstivatione plicata. Stamina 5, inclusa ; 
filamenta dilatata, tenuia, glabra, corolle tubo imo adnata, infra 
medium libera; anthere oblonge, 2-loculares, loculis parallelis, 
connectivo dorsali adnatis, basi paulo cordatis, in sinu affixis, 
longitudinaliter dehiscentibus. ^ Ovarium obovatum, 2-loculare, 
ovulis plurimis in dissepimento incrassato utrinque affixis. Sty/us 
filiformis, apice incrassatus. Stigma capitato-bilobum. Bacca 
magna, ovata, calyce inflata inclusa, 2.locularis. Semina nume- 
rosa, compressa, reniformi-rhomboidea, in pulpam copiosam nidu- 
lantia, testa scrobiculata, hilo in sinu laterali perforato. Hmbryo 
intra albumen carnosum fere semiannularis, filiformis, cotyledo- 
VOL. VII. 2s 
