360 Mr. CoLEBROOKE on Boswellia 
but most entire. For instance, Amyris punctata, A. sumatrana, 
and A. heptaphylla of Roxburgh. (This last is not to be con- 
founded with Aublet's Icica heptaphylla, which is the Amyris 
ambrosiaca of Willdenow.) In all three the nectary is a large 
fleshy receptacle, separated from the receptacle of stamina and 
petals by a strangulation or contraction, which leaves an upper 
protuberance to uphold the germ, and a lower to receive the 
filaments and petals. The mature fructification of two of these 
plants has been observed and described. ‘The seeds have no 
osseous covering, but a single tender integument. ‘Their coty- 
ledons are simple; flat on the contiguous sides, and convex, 
conform to the seed, on the outer surface. 
Perhaps another division might be proposed for such plants 
as have a nectary distinctly glandular. For example, Commi- 
phore Madagascariensis of Jacquin, the same with Roxburgh's 
Amyris Agallocha. Its nectary consists of as many glands as 
there are stamina, situated at the insertion of these. But the 
fruit of this species has not been yet inspected, nor even the 
hermaphrodite flower. Roxburgh, as well as Jacquin, was 
unable to find any besides male flowers. 
It does not, however, appear in other instances, where the 
complete fructification has been examined, that those differences 
in the nectary precisely correspond with primary differences 
observable in the mature fructification, on which, as I appre- 
hend, reliance is to be ultimately placed for a main ground of 
generic distinction. Yet it is material to attend to the nectarial 
character in this group of plants. If the staminiferous disk be 
connected, as in my view it is, with the germ rather than with 
the calyx, it determines the hypogynous insertion of the sta- 
mina ; and consequently shows the necessity of disjoining these 
plants from the perigynous order of Terebinthacee, with which 
they have been associated. In this remark I rely on the maxim, 
that 
