282 MISSISSIPPI STATE GEOLOGICAL SURVEY [ Bull. 
SILP TE pla 
Silphium laciniatum L. (*. gummiferum Ell.) Compass 
Plant. 
Dry open prairies. '«; elo; Scooba; seen once near Ox- 
ford. Summer. 
Silphium terebinthinaceum Jacq. Prairie Dock. 
Grassy openings and prairies. Tishomingo Co.; Tupelo; 
Noxubee Co. August. 
Geol. Surv. Herb. 
Silphium perfoliatum L. Cup Plant. 
Rich moist soil on stream banks. Collins. Summer. 
Geol. Surv. Herb. 
Silphium scaberrimum Ell. Scabrous Rosin Weed. 
Prairies and edges of fields. Oxford; Lost Gap; Jackson. 
July. 
Geol. Surv. Herb. 
Silphium asperimum Hook. (S. radula Nutt.) Rough Rosin 
Weed. 
Dry open pastures and borders of fields. Lumberton. 
Summer. 
Silphium integrifolium Michx. Entire-leaved Rosin Weed. 
Open prairies and upland fields. Houston; West Point; 
Durant. Summer and fall. 
Geol. Surv. Herb. 
Silphium asteriscus L. Common Rosin Weed. 
Dry open sandy or rocky soil. Meridian; Batesville. Sum- 
mer and fall 
Silphium glabrum Eggert. Smooth Rosin Weed. 
Dry open pastures and fields. Rocky Ford; West Point; 
Heidelberg. Summer and fall. 
Geol. Surv. Herb. 
Silphium gracile A. Gray. Slender Rosin Weed. 
Prairies and dry open fields and pastures. Amory. Sum- 
mer. 
Geol. Surv. Herb. 
