STANDLEY—STUDIES OF TROPICAL AMERICAN PHANEROGAMS. 435 
other species was described by Schumann in 1889, from northwester 
Brazil. 
Heretofore all material of this genus from Central America has 
been referred, without hesitation, to Sommera arborescens. TFxami- 
nation of a sheet of the type collection in the U. S. National Her- 
barium shows that the Mexican plant is very different from any of 
the Central American specimens. Schlechtendahl states that in his 
specimens the cymes are 3 to 5-flowered: and in our Mexican specimens 
this number is never exceeded, while the flowers are closely aggre- 
gated at the end of the peduncle. All of our other specimens, how- 
ever, have an open, broad, many-flowered cyme. 
The most striking peculiarity of the genus is the lineolate ap- 
pearance of the tissue between the reticulate veins. ‘This is char- 
acteristic, also, of the closely related genus Watsonamra, several 
species of which are found in Central America. 
KEY TO THE SPECIES. 
Style glabrous at the apex_______--____----__-_-------__ 1. S. sabiceoides. 
Style pilose at the apex. 
Cymes 3 to 5-flowered; calyx lobes lanceolate or 
oblong-lanceolate, acuminate__________________ 2. S. arborescens. 
Cymes many-flowered; calyx lobes oblong to broadly 
oblong or ovate, from broadly rounded to merely 
acute at the apex. 
Bracts of the inflorescence broadly ovate to oblong, 
obtuse or shortly and: abruptly acuminate; 
calyx lobes longitudinally veined, the veins 
not conspicuously reticulate; peduncles 
slender, 2 to 5 em. long_____--_--_-______- 3. S. guatemalensis. 
Bracts of the inflorescence lance-ovate to linear, 
attenuate or long-acuminate at the apex; 
calyx lobes conspicuously reticulate-veined ; 
peduncles stout, 8 to 15 mm. long. 
Leaf blades oval to. broadly oblong-obovate, 
not more than twice as long as broad, 
round or broadly cuneate at the base, 
pubescent beneath with very short ap- 
pressed hairs, the surface not velvety 
to the touch; bracts lance-ovate or 
lanceolate, without green tips; corolla 
tube sparingly pubescent outside______ 4. 8. donnell-smithii. 
Leaf blades oblanceolate to elliptic-oblanceo- 
late or rarely obovate, usually much 
more than twice as long as broad, 
cuneate to attenuate at the base, pubes- 
cent beneath with long and usually 
spreading hairs, somewhat velvety to 
the touch; bracts mostly linear or 
lance-linear, with green tips; corolla 
tube densely pubescent outside________ 5. S. mesochora. 
8211°—14——-2 
