STANDLEY—MEXICAN AND CENTRAL AMERICAN FICUS. 3 
SYSTEMATIC TREATMENT. 
KEY TO THE SPECIES. 
Receptacles solitary; involucre trilobate; stamens 2. (Sub- 
genus PHARMACOSYCE. ) 
Leaf blades hirtellous or short-pilose beneath; receptacles 
pilose or hirtellous. ........... 2.0... eee ee ee eee eee 1. F. glaucescens. 
Leaf blades glabrous or merely scabrous beneath; recepta- 
cles glabrous or nearly so, at least in age, or some- 
times scabrous. 
Young branches densely pilose-sericeous. Leaf blades 
glabrous, gradually acute or acuminate at the 
C0: >, 2. F. radulina. 
Young branches glabrous or finely and sparsely puberu- 
lent. 
Lateral veins of the leaf blades very coarse and 
stout, 1.5 to 4.5 cm. apart, about 10 on each 
side; leaf blades very large, 12 to 24 cm. 
long, 6 to 12.5 cm. wide, glabrous, rounded 
and abruptly apiculate at the apex......... 3. F. tonduet. 
Lateral veins slender, usually not more than 1 cm. 
apart; leaf blades mostly much smaller. 
Leaf blades gradually acute to long-acuminate 
at the apex. 
Blades of the leaves about 4 times as long 
as broad, acute at the base, gla- 
brous. .. 2.2... ee ee eee ee eee eee eee 4. F. segoviae. 
Blades of the leaves not more than two 
and one-half times as long as broad, 
usually very obtuse or rounded at the 
base. 
Lateral veins of the leaf blades 14 to 21 
on each side, the surfaces gla- 
brous. .....-----+-e- eee eee eee 5. F. glabrata. 
Lateral veins usually 12 to 15 on each 
side, the surfaces usually very 
sCabrous......-.--.2+020-eee . 6. F. mexicana. 
Leaf blades rounded or very obtuse at the apex 
or abruptly apiculate. 
Stipules 1 to 1.5 cm. long; leaf blades sca- 
brous, usually apiculate, the lateral 
veins 7 to 12 on each side. . 7. F. radula. 
Stipules 4 to 6 cm. long; leaf blades gla- 
brous, very obtuse at the apex, not 
apiculate, the lateral veins 14 to 22 
on each side....-.-...-......2-5-- 8. F. crassiuscula. 
Receptacles geminate; involucre bilobate'; stamen 1. (Sub- 
genus URosTIGMA.) 
Involucre very asymmetric, adherent to the receptacle over 
a large portion of its surface, the receptacle attached excen- 
trically to the peduncle and its main axis thus parallel to 
that of the supporting branch. Receptacles 5 to 10 mm. 
in diameter; leaf blades glabrous. 
Receptacles pedunculate cece cece cee eee cece eee e eee eeeees 9. F. tecolutensis. 
1 Very often the involucre appears to have more ° than 2 lobes, but th is is because 
the lobes are split by the expanding receptacle. 
