Robinson and Greenman—New Plants. 175 
IV. Miscellaneous New Species. 
Unona Panamensis Robinson. A small tree, 15 to 20 feet high: 
branches brown with lighter colored lenticels ; the young parts 
finely rufous-tomentose with simple hairs: petioles a line or two 
in length: leaves oblong or elliptic, shortly acuminate, somewhat 
narrowed at the base, entire, 4 to 8 inches long, about a third as 
broad, glabrous above, covered beneath especially upon the veins 
with an appressed rufous silky pubescence: peduncles opposite the 
leaves, rather short, 4 to 6 lines in length, bearing at the summit a 
suborbicular cordate bract half inch in diameter (rarely larger 
and more like the leaves, rarely absent) and 1 or 2 elongated 
curved pedicels, slightly thickened near their summits and 3 to 34 
inches long: calyx-segments ovate-triangular, a line in length: 
petals 6, equal, lance-linear, nearly erect, finely pubescent upon 
the outer surface, minutely granulated within, 6 to 8 lines long ; 
the edges revolute ; the tips incurved: maturing carpels 5 to 12, 
oblong, a little over half an inch in length, 5 lines in diameter, 
very slightly torulous, rounded at each end; stipe slender, 3 to 4 
lines long: seeds about 6, disk-shaped.—Collected by Sutton 
Hayes in woods near Gatun Station on the Panama Railway, 30 
July, 1860. . 
Unona BIBRACTEATA Robinson. Branchlets light brown, 
nearly or quite glabrous: leaves lance-oblong, narrowed to an 
obtuse apex, contracted below to a very short thickish petiole, 
green and glabrous upon both surfaces, 2; to 3 inches long, an 
inch in breadth, firm but not coriaceous in texture: peduncles 
opposite the leaves, bearing two very unequal suborbicular cor- 
date bracts; the lower one a third to half inch, the upper only a 
line in diameter; pedicel recurved, slender, about an inch in 
length : segments of the calyx ovate, 2 lines in length: petals 
linear-oblong, obtusish, 8 lines in length: maturing carpels about 
15, glabrous, two-seeded, 4 lines long, 3 lines in diameter, sub- 
truncate at apex and base, somewhat constricted in the middle; 
stipes slender, 3 lines in length; seeds disk-shaped, 14 lines thick. 
—Collected by Charles Wright in Nicaragua upon the U. S. 
North Pacific Exploring Expedition in 1855. 
The only other U/nona reported from Central America, the 
rather doubtful and imperfectly described UW. violacea Dunal, 
has according to the original figure in Dunal’s monograph a con- 
siderably larger flower with broader petals and no bracts. All 
efforts to ideatify the two species here described with those of the 
Old World have failed and their occurrence does not suggest an 
introduced character. 
Matvaviscus Prineter E. G. Baker. Caule ligneo, foliis 
membranaceis viridibus cordatis acute palmate-5-lobatis, lobo 
medio majore, precipue junioribus utrinque stellato-pubescentibus 
serratis petiolatis, floribus maximis axillaribus solitariis vel ad 
extremitatem ramulorum subracemosis, bracteolis ligulatis calyce 
brevioribus, sepalis triangularibus vel ovatis acutis intus margine 
