300 SCHOMBURGK'S GUIANA PLANTS. 
Gardners n. 39 and 378, and Mathews n. 1273, 1276, ; 
and 1316, belong to Rhynchanthera. Gardner’s n. 381 is 
Lavoisiera imbricata, (DC.). ! 
Tribe IV.. MICONIES. 
Numerous as are the American species in this one of the — 
best defined tribes, the great mass of them belong to two vast — 
genera, Clidemia and Miconia, and even these are so near — 
together in all essential characters, that it becomes very diffi- 
cult to define them positively; yet they are so naturally separ- 
ated, that few species of either may not at the first glance — 
be referred to their proper genus. The only positive char- re 
acter appears to consist in the setze (often very small) which 
crown the ovary in Clidemia, and are wanting in. Micoma. — 
But, in habit, the Clidemie are coarse plants, with rugose m 
leaves, and generally more or less covered, especially the 1m- — 
florescence and calyx, with rigid bristles or hairs, with we * 
without an admixture of stellate down; whilst the Micome * 
have usually the upper side of the leaf smooth, and the fe 
side, the stems and inflorescence, either smooth or covered 
with a close, short, somewhat farinaceous or floccose, oF stellate I 
down, the stems very seldom clothed with long soft hai. — 
The inflorescence of Clidemia is axillary or terminal, dé 
lowers few and sessile, or numerous and paniculate; in Mico- - 
- nia it is always terminal and paniculate. The teeth of the * 
calyx in Clidemia are frequently subulate; never perhaps m » 
Miconia. The petals and stamens are nearly the same n — 
both, and the fruit in both is equally variable in the number — 
of cells from three to five, but it is usually more fleshy bis = 
pulpy in Clidemia than in Miconia. jd 
The limitation, however, between these two genera and | 
some of those separated from them is not so easy. Martius — 
has already shown that Tschudya and Sagrea must be united p 
~ „With Clidemia, in many species of which the number ok quat. n 
. of the flower is variable. Leandra, it would appear; must 
share the same fate; for the duplication of the teeth of the 
calyx is more or less observable in many Clidemie, ne 
