POTAMOGETONACEAE 
Potamogeton x faxonii Morong (P. illinoiensis x P. nodosus), 
p. 56 
ROSACEAE 
Crataegus x conspecta Sarg. [S: C. locuples Sarg.] (Phipps and 
Muniyamma, 1980) (Gleason and Cronquist (1963) 
Suggested that this represents the hybrid C. mollis x 
C. punctata, while Little (1979) suggested C. mollis x 
C. pruinosa, but Kruschke (1965) argued against a 
hybrid interpretation), p. 820 
Crataegus x danielsii E. J. Palmer [S: incl. f. glabra E. J. Palmer] 
(Gleason and Cronquist (1963) and Little (1979) have 
Suggested that this taxon represents the hybrid C. crus- 
galli x C. punctata Jacq.; if this is shown to be true, 
then an older name, C. x disperma Ashe, probably 
should be used instead), p. 814 
Crataegus x incaedua Sarg. (Gleason and Cronquist (1963) and 
Little (1979) suggested that this taxon represents the 
hybrid C. calpodendron x C. punctata Jacq. sensu 
lato), p. 815 
Crataegus x kelloggii Sarg. (S: Suggested that this taxon 
represents the hybrid C. mollis x C. margaretta, 
Gleason and Cronquist (1963) suggested C. mollis x C. 
rotundifolia Moench, and Little (1979) suggested C. 
mollis x C. chrysocarpa Ashe; the latter two placed C. 
margaretia in synonymy with C. rotundifolia and C. 
chrysocarpa, respectively), p. 816 
Crataegus x latebrosa Sarg. (S: suggested that this taxon 
represents the hybrid C. collina x C. noelensis), p. 816 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
