(Polypremum procumbens, continued) 
classifying genera into families that Polypremum is 
treated here in the Buddlejaceae; see Rogers (1986) 
for a discussion of this controversy), p. 1184 
CABOMBACEAE, water shield family 
[S: NYMPHAEACEAE] 
BRASENIA, water shield 
Brasenia schreberi J. Gmelin, p. 669 
CABOMBA, fanwort 
Cabomba caroliniana A. Gray, fanwort, Carolina water shield, 
p. 669 
CACTACEAE, cactus family 
OPUNTIA, prickly pear 
Opuntia ee (Raf.) Raf., eastern prickly pear [S: O. 
compressa (Salisb.) J. F. Macbr.] (Dress, 1975; Benson, 
157) p. 1084 
var. hum 
0. macrorhin Engelm, plains prickly pear, p. 1086 
. macro 
+0. paces Haw., plains prickly pear (Benson, 1982) 
var. polyacantha 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
