54 
CONTRIBUTIONS TO BOTANY. 
take an opportunity of pointing out the identity above mentioned. 
Anacolosa was first proposed as a second section of his genus 
Stemonurus by Dr. Blume in his ‘Bijdr.’ p. 648 : more recently, 
he has with ample reason elevated it to the rank of a separate 
"enus {loc. cit. p. 250), w'ith the important addition of analytical 
details of its structure, in tab. 46 of the same work. The facts 
there demonstrated prove beyond doubt, that they must con- 
stitute not only very distinct genera, but that they must be re- 
ferred to different families. Anacolosa will consequently find its 
place among the Olacacece, and it is rendered more interesting, 
as bearing considerable resemblance in some of its characters to 
Cathedra {huj. op. p. 9) with which genus, the Diplocrater 
of Mr. Bentham (Hook. Kew. Misc. iii. p. 367) will be found 
to be identical. Stemonurus, as an unquestionable member of 
the Icacinacece, will therefore be shortly investigated here. The 
genus Platea of the same botanist, first proposed in his ‘ Bijdra- 
gen,’ and of which more ample generic details are given in his 
‘ ]\Ius. Lugd. Bat.’ p. 249, appears to me to differ in few essential 
respects from Stemonurus : the stamens in this last-mentioned 
genus vary considerably in length, not only in different species, 
but often in the same individual, according to the age of the 
flowers ; the number and length of the villous hairs that clothe 
the summits of the filaments are not less variable; in some 
cases these hairs are almost obsolete and scarcely discernible, so 
that the stamens are reduced to the state of those described in 
the male flower of Platea, which differs in no other respect from 
Stemonurus : the female flowers also agree in all essential points 
with those of the genus last-mentioned, where, owung to the ex- 
tremely caducous disposition of the petals and stamens, w’e often 
find, in several species of Stemonurus, just what is described in 
the character of Platea. As Lepionurus does not belong to the 
Icacinaceee, I shall defer making any observation on that genus, 
until we come to treat of the genera of the Olacacece. 
ICACINA. 
This genus, which,'as the first discovered, may be considered as 
the tjqie of the family to which it belongs, was founded by Adr. 
de Jussieu in 1823, upon a plant from Senegal, bearing much the 
habit of Chrysobalanus Icaco, w hence the derivation of its generic 
name. It w’as arranged by DeCandolle in his ‘ Prodiomus,’ i. 
534, as a genus “ Olacineis affine,” and subsequently w'as placed 
m the same family by Mr. Bentham, as the type of his tiibe 
Icacinece. I may here remark, that in the young state, the stigma 
is distinctly 3-cleft, and the style is short, erect and straight as in 
Mappia ; it is owing to its elongation while yet in bud, that it 
becomes incurved, and to pressure against the petals, that its 
