87 



swamp sqitaw-wecd, life root, false valerian, — piunk- 

 um, grundy-swallow. 



S. glahcllus. BuTTf;r-\vei:d. Cress-leaved .i^rcund- 

 sel. 



S. Jacohaca. Stinking WilliK. Tansy-ra^j^wort 

 staggerwort, star- wort, kettle-dock, felon- weed, cank- 

 er-weed, St. James' wort, Saracen's compass, fairies' 

 horses, (ragweed.) 



S. palustris. Marsh Flea wort. Marsh ground- 

 sel, pale ragwort. 



S. tomcntosus. Woolly Ragw^ort Ash-weed. 



S. vulgaris. Common Groundsel. Bird-seed. — 

 chicken-weed, grinsel, simson. 



SERICOCARPUS. 



S. asteroides. White-topped Aster. 

 S. bifoliatus. WhiTE-TippEd Aster. Silk-seed 

 aster, rough white-topped aster, rattlesnake's master. 



SILPHIUM. Rosin-weed. 



S. laciniatiim. Rosin- weed. Compass-plant, pilot- 

 weed, polar-plant, gum-plant, turpentine-plant, tur- 

 pentine-weed. 



S. perfoliatum. Cup-plant. Indian cup. ragged 

 cup. 



S. terehinthinaccuni. Prairie Dock. Rosin-weeti. 

 rosin-plant, gum-plant, prairie burdock, compass-plant. 



S. trifoliatiim. Three-LEaved Rosix-weed. 



SILYBUM. 



S. Marianiim. Lady's Thistle. Milk thistle, 

 Virgin Mary's thistle, holy tliistle. Lady's milk. 



