STANDLEY—TROPICAL AMERICAN PHANEROGAMS. 207 
villosulous along the costa or glabrate, the lateral veins prominent, about 14 
on each side, arcuately subdivaricate; cymes sessile or short-pedunculate, few 
or many-flowered, about 2 cm. long, the flowers 4-parted, the pedicels slender, 
1 to 6 mm. long; calyx tube oblong, glabrous, 2 mm. long, the lobes lance- 
triangular or oblong, obtuse, 1 to 2.5 mm. long, sparsely puberulent; corolla 
10 to 12 mm. long, yellow, glabrous, the lobes narrowly oblong, obtuse, about 
equaling the tube; anthers 3 mm. long, yellow; fruit oblong, 5 mm. long or 
larger. 
Type in the U. S. National Herbarium, no. 567526, collected on Cerro del 
Boquerén, Chiapas, Mexico, June, 1914, by C. A. Purpus (no, 7268, in part). 
Specimens of the same collection in the Gray Herbarium and the herbarium of 
the New York Botanical Garden also belong here. 
Hoffmannia conzattii Robinson and H. strigillosa Hemsl. are both close 
relatives, but have the leaves glabrous or strigillose beneath and of different 
outline. 
A specimen of Purpus’s no. 7268 in the herbarium of the Missouri Botanical 
Garden is the type of Hoffmannia rotundata, described above. 
NEW RUBIACEAE OF VARIOUS GENERA FROM NORTH AMERICA. 
Of the species of this group discussed here the most interesting 
is the new Duroia, for this genus has been known previously only 
from South America. It is a characteristic example of the numerous 
genera added to the known flora of North America by recent explora- 
tions in Panama and Costa Rica. The writer has already described 
species of Cassupa’ and Stachyarrena® from Panama, two other 
genera previously believed to be exclusively South American. 
Alseis Schott; Spreng. Syst. Veg. 4: Cur. Post, 404. 1827. 
A collection made by Dr. G. F. Gaumer at Buena Vista Xbac, Yucatéin 
(no. 1048), is of unusual interest, because it belongs undoubtedly to this genus. 
The material collected consists of leafless fruiting branches, and so, unfor- 
tunately, it is impossible to determine what species is represented. Alseis is 
represented by four known species, three of them natives of Brazil and 
Venezuela, the other, A. blackiana Hemsl., of Colombia and Panama. The 
Yucatin collection, consequently, represents a large extension of range for 
the genus. So far as may be judged from the fruit the Yucatin plant may be 
the same as the Panamanian one. Doctor Gaumer gives the Maya name as 
“ cacaoché.” 
Hamelia costaricensis Standl., sp. nov. 
Branchlets stout, angulate, densely and minutely fulvous-puberulent ; stipules 
small, deltoid; leaves opposite, the petioles slender, 1.2 to 3.5 em. long, minutely 
puberulent, the blades oval-ovate or oval-elliptic, 8 to 19 em. long, 4 to 10.5 cm. 
wide, rounded and short-decurrent at the base, very acute or subacuminate at 
the apex, membranaceous, minutely puberulent along the veins, the venation 
prominent beneath, the lateral veins about nine on each side, subarcuate; in- 
florescence pedunculate, branched, the branches puberulent, the flowers sessile, 
, secund ; calyx densely puberulent, the tube oblong, 3.5 mm. long, the lobes subu- 
1Contr. U. S. Nat. Herb. 18: 185. 1916. 
?Contr. U. S. Nat. Herb. 18: 142. 1916. 
