Amsonia tabernaemontana Walter, blue star, willow amsonia, 
var. gattingeri Woodson [G: A. tabernaemontana] ain validity 
of maintaining infraspecific taxa in this speci 
requires further study) 
var. salicifolia (Pursh) Woodson [G: A. tabernaemontana] (see 
ote above 
var. tabernaemontana 
APOCYNUM, dogbane, Indian hemp 
Apocynum androsaemifolium L., spreading dogbane, pink-flowered 
dogbane, p. 1198 
var. androsaemifolium 
A. cannabinum L., Indian hemp, prairie dogbane, p. 1198 
var. cannabinum 
var. pubescens (Mitchell) A. DC. [G, M: A. cannabinum] (the 
validity of maintaining infraspecific taxa in this species 
requires further study; see Rosatti (1989) for 
discussion) 
A. medium E. Greene (note that nomenclature and taxonomy of 
this taxon require further study; it is considered by 
most authors to represent the widespread, fertile 
hybrid, A. androsaemifolium x A. tes ig be several 
workers have pointed out that the name 
floribundum E. Greene has priority over A. acon if 
these should prove to represent the same taxon), 
1198 
A. sibiricum Jacq. [G: A. cannabinum] (Woodson, 1930, 1938; 
Rosatti, 1989), p. 1200 
var. cordigerum (E. Greene) Fern. [G: A. cannabinum] 
(Woodson, 1930, 1938; Rosatti, 1989) 
var. sibiricum 
TRACHELOSPERMUM 
Trachelospermum difforme (Walter) A. Gray, climbing dogbane, 
p. 1196 
S: Steyermark G: Great Plains Flora M: Mohlenbrock 
