90 MISC. PUBLICATION 243, U.S. DEPT. OF AGRICULTURE 
Severn Repusiic: Guayubin, Abbott 955. Valverde, Ekman 
13096. 
Purnrto Rico: Boqueron, Chase 6506, 6510. Guanica, Sintenis 
3438, 3766. Cabo Rojo, Sintenis 553. Mona Island, Hess 437. 
Virain Isuanps: St. Croix, Thompson 22; Ricksecker 64; Rose 3211. 
LEEWARD ISLANDS: 
Antigua, Wullschlaegel; 
Box 127. Guadeloupe, 
Duss 3159. : 
WINDWARD ISLANDS: ~ 
Montserrat, Shafer 18. 
3. Aristida spiciformis 
Ell., Bot. S.C. and 
Gace Sl SiG: 
South Carolina. 
Culms tufted, stiffly 
erect, 50 to 100 cm tall; 
panicle erect, dense and 
spikelike, mostly 10 to 
15cm long, the branches 
short and appressed, 
the whole panicle more 
or less spirally twisted; 
lemma, excluding the 
_ slender callus 1 mm 
long, about 4 mm long, 
extending into a twisted 
column 10 mm long; 
awns about equal, 1.5 
to 2 cm long, spreading 
(fig. 54). 
Some of the material 
from the United States 
Meh paid has larger spikelets than 
FIGURE 54.—Aristida spiciformis, X 1 (Combs and Baker 1115). that from the West 
Indies. 
Sandy barrens in thickets or pine woods, southern United States, 
Cuba, and Puerto Rico. 
Cupsa: Pinar del Rio, Hkman 17811. Isla de Pinos, Britton and 
Wilson 14198. 
Purrto Rico: Campo Alegre, Chase 6614 (Amer. Gr. Nat. Herb. 
765). 
4. Aristida laevigata Hitche. and Ekman, N. Amer. Fl. 17: 390. 
1935. Cuba, Ekman in 1922. 
Culms cespitose, erect, glabrous, several-noded, 60 to 100 cm tall; 
sheaths glabrous; ligule a ciliate membrane less than 0.5 mm long; 
blades closely involute, firm, somewhat curved or flexuous, 0.5 to 
1 mm thick when rolled, smooth on the outer surface, 10 to 20 cm 
long, villous on the upper surface near the base and around the summit 
of the sheath; panicles long-exserted, 20 to 30 em long, the branches 
mostly solitary, distant, stiffly ascending, the lowermost as much as 
15 cm long, the branchlets appressed along the branches, the axis 
