SENECIO, ragwort, groundsel 
¢Senecio ampullaceus Hook., Texas groundsel, p. 1654 
S. aureus L., golden Tagwort, squaw weed [S: incl. var. gracilis 
(Pursh) Hook., var. intercursus Fern.] (Barkley, 
1962), p. 1616 
S. glabellus Poiret, butterweed, p. 1615 
S. obovatus Muhlenb. ex Willd., squaw weed, roundleaf groundsel, 
p. 
S. pauperculus Michaux, northern ragwort [S: incl. var. balsamitae 
(Muhlenb. ex Willd.) Fern.] (Barkley, 1962), p. 1616 
S. plattensis Nutt., prairie Tagwort, p. 1615 
S. pseudaureus Rydb., golden Tagwort, squaw weed, p. 1618 
var. semicordatus (Mackenzie & Bush) T. Barkley [S: S. aureus 
Var. semicordatus (Mackenzie & Bush) Greenman] 
(Barkley, 1962) 
*S. tomentosus Michaux (Barkley, 1980) 
4S. vulgaris L., common groundsel, p. 1615 
SERINIA (see KRIGIA) 
SILPHIUM, rosinweed 
Silphium asteriscus L, starry rosinweed, p. 1549 
var. scabrum Nutt. (Missouri plants were first classified at the 
varietal level by Cronquist (1980)) 
S. integrifolium Michaux, p. 1548 
var. deamii Perry [S: 5. integrifolium £. deamii (Perry) Steyerm.; 
_ MS. integrifolium| (Settle and Fisher, 1970) 
var. integrifolium 
var. laeve Torrey & A. Gray 
S. laciniatum L., compass plant, Tosinweed, p. 1550 
Var. laciniatum 
S. perfoliatum L, cu 
var. perfoliatum 
: perfoliatum 
Petiolatum E, J. Palmer & Steyerm. 
S. terebinthinaceum Jacq., prairie dock, “ 1550 
P plant, cup rosinweed, p. 1547 
S: Steyermark &: Great Plains Flora M: Mohlenbrock 
