THE OAK-VEGETATION OF AMERICA. rE 
parvæ, orbiculatæ. Flores aperti pollicem diametro. Petala intus 
per totam partem concavam glabra, apice uti extus sericea. Torus 
glaber. Anthere numerose, subsessiles, 1 lin. longæ. Ovaria glabra. 
On the south shore of the Rio Negro, towards its confluence with 
the Solimóes. 
4. Duguetia Jongicuspis; ramulis cano-tomentosis, foliis anguste ob- 
longis longe cuspidatis basi rotundatis supra glabris subtus lepidotis 
pallescentibus, peduneulis brevissimis lateralibus solitariis, bracteis 
minutis, petalis (pollicaribus) ovatis cano-tomentosis calyce duplo 
longioribus.—Affinis D. Quitarensi et (ex deser.) D. Spixiane, dis- 
tinguitur ramulis, petiolis, costa paginze inferioris, et floribus tomento 
brevissimo incanis. Folia 6-8 poll. longa, 13-2 poll. lata, apice in 
acumen pollicare contracta, rigidule membranacea. Pedunculi circa 
2 lim. longi. Sepala late ovata, acuta, fere 6 lin. longa. Petala 
perfecte evoluta, fere polliearia, obtusa, pallide purpurea. 
A small tree, on the Lago do Alexo, near the mouth of Rio Negro. 
5. Rollinia resinosa, Spruce, MS.—R. glaucescens, Miq. Stirp. Surin. 
p. 108 (1851), non Sond. Linnza, vol. xxii. p. 557 (1849). ; 
A small tree from Matinho, near Barra do Rio Negro, with shining — 
black bark, minutely dotted with grey; the flowers aromatic and the - 
leaves, when bruised, emitting a strong resinous odour, whence Mr. 
Spruce derived his name. It appears to be not uncommon in Guiana, : 
and is well described by Miquel, whose name I suppress with regret, it 
having been previously applied by Sonder to a Minas Geraes species. 
Besides Hostmann's Surinam specimens I have others from British | 
Guiana numbered 942 in Sir Robert Schomburgk's collection, or 1302. 
in that of his brother Richard. 
Americas EGEVEGETATION, etc. (The Oak-vegetation of America; 
abridged from two popular lectures delivered before the Association - 
of Natural History of Copenhagen, and separately reprinted.) By 
Professor F. LIEBMANN. Copenhagen, 1851. Translated from the 
Danish, by Dr. WALLICH, F.R.S., V.P. Linn. Soc. 
(Continued from p. 327) 
: All the Oaks of tropical Mexico are of the so-called evergreen sort, 
with some apparent ei cot to be noticed hereafter. 
VOL, V. 
