CONTRIBUTIONS TO BOTANY. 
129 
Celastral alliance, and particularly, as I have demonstrated, in 
the Icacinacea, the raphe is frequently dorsal ; and I have ven- 
tured to explain the cause of this occurrence in my memoir on 
the development of the anatropal ovule*. Mr. Thwaites has been 
unable to discover any incomplete dissepiment in the fruit of this 
genus, but only an inflexion of the putamen : this is simply a 
difiPerence in terms; for it is undeniable that such a thick semi- 
septum exists, and is well figured by Dr. Wight (Icon. 956. f. 8). 
In the ovary, the rudiment of this projection is seen in the pa- 
rietal nervure which extends from the apex to the base, and 
from the summit of which the ovule is suspended, as in Vil- 
laresia ; this nervure, in both instances, is the displaced axis of 
the abortive cells, and contains the nourishing-vessels of the 
placenta. 
The incrassation of the summit of the ovary in this genus 
assuming the appearance of an epigynous disk is notan uncommon 
feature even in the superior ovary, as I have long ago indicated 
in Hyoscyamus, in most of the Olacacea-^, Santalacece, Icacinacece, 
and Styracece. 
Bursinopetalum, Wight. — Flores polygami. Calyx semi- 
adnatus, apice liber et in dentes 5 acutos divisus. Petala 5, 
dentibus calycinis alterna, oblonga, apicibus 2-3-dentatis in- 
troflexis, intus nervo carinseformi instructa, in sestivatione 
quincuncialiter imbricata, valde decidua. Stamina 5, petalis 
alterna ; filamenta subulata, subcomplanata, imo dilatata ; an- 
therce 2-lobse, lobis segregatis, ad connectivum carnosum cordi- 
formem filamento apicifixum dorso collateraliter adnatis, singu- 
lis 2-locellatis, et rima longitudinali introrsum dehiscentibus. 
Ovarium semisuperum, in S depressum, et radiato-sulcatum, 
in 2 conicum, glandula disciformi apiculatum, 1-loculare, 1- 
ovulatum : ovulum e summo placentae longitudinalis parietalis 
carinaeformis suspensum. Stylus brevis, crassus, apice trun- 
catus et cavus. Stigma obsoletum, in cavitate styli sistens. 
Drupa sicca, ovalis, dentibus calycinis emarcidis coronata; 
putamen coriaceum, crassissimum, indehiscens, revero 1-locu- 
lare, sed ob incrementum placentae, nunc in laminam crassam 
longitudinalem fere ad axin loculi prolatae, semibiloculare, 
monospermum. Semen suspensum, loculum implens, et hinc 
circa semiseptum longitudinale plicatum; testa e laminis 2 
farctura cellulosa repletis crassiuscula, laxa, ad endocarpium 
semiadhaerens, raphe dorsali chordiformi ea immersa ; integu- 
mentum internum tenuissimum, testa multo minus, albumen 
* Contributions to Botany, i. 209 ; Ann. Nat. Hist. 3 ser. iv. 24. 
t Contributions to Botany, i. 37 ; Ann. Nat. Hist. 2 ser. viii. 177- 
VOL. II. 
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