PERIDERIDIA 
Perideridia americana (Nutt. ex DC.) Reichb., p. 1136 
POLYTAENIA 
Polytaenia nuttallii DC., prairie parsley, p. 1146 
PTILIMNIUM, mock bishop’s weed 
Ptilimnium capillaceum (Michaux) Raf., p. 1138 
P. costatum (Elliott) Raf., p. 1140 
P. nuttallii (DC.) Britton, p. 1138 
SANICULA, black snakeroot, sanicle 
Sanicula pra L., p. 1121 
var. canadensi 
var. grandis Fern. [G, M: S. canadensis] (Pryer and Phillippe, 
1989 
S. odorata Sen ) Pryer & Phillippe [S, G, M: S. gregaria E. 
kn.] (Pryer and Phillippe, 1989), p. 1121 
S. smallii Pe Bickn, p. 1122 
SIUM 
Sium suave Walter, water parsley, water parsnip, p. 1136 
SPERMOLEFPIS, scale-seed 
Spermolepis divaricata (Walter) Britton, forked scale-seed, p. 1130 
S. echinata (Nutt.) A. A. Heller, p. 1130 
S. inermis (Nutt.) Mathias & Constance, p. 1130 
TAENIDIA 
Taenidia integerrima (L.) Drude, yellow pimpernel, p. 1136 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
