CONTRIBUTIONS TO BOTANY. 
229 
3. Poraqueiba sericea, Tulasne, ibid. p. 484; huj. op. p. 72. — 
Ega, Amazonas. 
4. Poraqueiba acuminata, n. sp. ; — ramulis cylindricis, tomen- 
tillis ; foliis ovatis, basi rotundatis vel truncatis, apice subito 
acuminatis, crassis^ coriaceis, superne nitidiusculis, subtus fla- 
vido-pruinosis, nervis supra omnino immersis, subtus promi- 
nentibus, parallele obliquis, ad marginem vix revolutum ar- 
cuatim nexis, venis transversis reticulatis, racbi supra sulcato, 
subtus valde prominente, petiolo longo crasso canaliculato ; 
racemis axillaribus folio tertio brevioribus, racbi crasso, ramis 
crassiusculis distantibus, brevibus, divergentibus, floribus fere 
sessilibus, bine agglomerato-spicatis. — Barra do Rio Negro, 
Amazonas (Spruce, 1748). 
This species is distinguished by its thicker and more coria- 
ceous leaves, with their underside and nervurcs thickly covered 
by a densely pruinose covering ; the nervures above (about eight 
on each side) are wholly immersed and smooth above, extremely 
prominent and thick beneath ; the main peduncle of the inflo- 
rescence is much thicker, and the flowers are perfectly sessile. 
The leaves are 8-10 inches long, 4|-5| inches broad, the petiole 
being 1 inch long and g inch thick : the raceme is 2| inches long; 
its thick branchlets are 6-10 lines long, diverging at nearly a 
right angle: the flowers, at the period of bursting, are l^ line 
long. 
Emmotum. 
To this genus I am enabled to add only partial details of its 
carpological structure, derived from an examination of Spruce^s 
specimen (No. 1989) of Emmotum acuminatum, with which I 
received a single fruit. This is a drupe of a depressed globular 
form, 8 lines in diameter, its vertical axis being 5 lines long ; 
its coriaceous sarcocarp, about ^ inch thick, covers a rugose 
osseous indehiscent nut of about the same thickness ; the latter 
is 5-celled, three or four of these cells being much smaller, 
and evidently semi-abortive; the other cell contained no seed, 
nothing remaining within but the dried and shrivelled integu- 
ments. 
1. Emmotum orbiculatum, nob, Ann. Nat Hist. 2 ser. x. 178; 
huj. op. p. 108. — Pogopetalum orbiculatum, Benth. Linn. 
Trans, xviii. 685. tab. 42. — In Brasilia Septentrionali. 
2. Emmotum acuminatum, nob., loc. cit. 178; huj. op. p. 108. 
tab. 21 B. — Pogopetalum acuminatum, Benth. loc. cit. 685. 
— Rio Negro Brasilise. 
