Two sample species are shown below to illustrate the organi- 
zation of the entries: 
* indicates an addition to the flora since Steyermark (1963) 
accepted names in boldface 
common name 
*Ophioglossum petiolatum Hook., stalked adder’s tongue (Thomas 
et al., 1974) 
references for additions or 
nomenclatural changes in parentheses 
# indicates a non-native taxon 
+C. prostrata (Aiton) Small, groundfig spurge, milk spurge [S, G: 
Euphorbia prostrata Aiton] (Webster, 1967), p. 994 
synonyms in brackets page number that 
ymy in each flora: species is treated on 
S: Steyermark (1963) in Steyermark (1963) 
G: Great Plains Flora 
Association (1 
M: Mohlenbrock (1986) 
The present catalogue is prima 
to additions and nomenclatural ¢ 
quo are included. me readers may criticize our decision to 
maintain a number of 
Ssouri, Illinois, and 
(F, KANU, MO, NEMO, sms UMO, WARM. and the 
University of Missouri, Kansas City) 
