Helianthus petiolaris Nutt., prairie sunflower, Kansas sunflower, 
i 69 
H. 
em 
plains sunflower, p. 15 
ssp. petiolaris 
rigidus (Cass.) Desf., stiff sunflower, prairie sunflower [S: H. 
laetiflorus Pers. var. rigidus (Cass.) Fern.] (Heiser et 
al., 1969) (note that although Kartesz and Gandhi 
(1990) argued that the earliest name for this species is 
H. pauciflorus Nutt., that epithet was treated by Heiser 
et al. (1969) as being of uncertain application, and the 
name H. rigidus continues to be accepted tentatively 
here), p. 1570 
ssp. rigidus 
*ssp. subrhomboideus (Rydb.) Heiser, D. M. Smith, Clev. & 
W. Martin [M: H. rigidus] (Heiser et al., 1969; 
Mihlenbach, 1983) 
salicifolius A. Dietr., willow-leaved sunflower, p. 1569 
silphioides Nutt., p. 1570 
strumosus L., pale-leaved sunflower, p. 1574 
tuberosus L., Jerusalem artichoke [S: incl. var. subcanescens A. 
Gray] (Heiser et al., 1969; note that while these 
authors treat the variety subcanescens as part of 
environmental variation in the species, they note that 
plants determined by S: as this variety were actually 
misdetermined and are H. strumosus), p. 1575 
HELIOPSIS, ox-eye 
Heliopsis helianthoides (L.) Sweet, ox-eye, false sunflower, 
3 
sunflower heliopsis, p. 1 
*var. helianthoides (Barkley, 1986) 
var. occidentalis (T. Fisher) Steyerm. [G: H. helianthoides var. 
scabra] (Turner, 1988 
var. scabra (Dunal) Fern., rough ox-eye [M: H. helianthoides] 
(Fisher, 1958) 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
