SONCHUS L. (Sow Thistle) 



1512 S. ARVENsis L. (Field Sow Thistle.) Common. 



1513 S. OLERACEUS L. (Common Sow Thistle.) Frequent. 



1514 S. ASPER Hill. (Spiny-Leaved Sow Thistle.) Occasional. 



LACTUCA L. (Lettuce) 



1515 L. scARioLA L. (Prickly Lettuce.) Common throughout. 



1516 L. CANADENSIS L. (Wild Lettuce, Horse-Weed.) Common. 



1517 L. CANADENSIS, VAR. MONTANA Britton. Monroc Country, Prof. 



Porter. 



1518 L. iNTEGRiFOLiA Bigel. Elmhurst. 



1519 L. HiRSUTA Muhl. 



1520 L. viLLosA Jacq. Mocanaqua. 



1521 L. SPICATA Hitchc. Farm of C. S. Woolworth, near Lily Lake. 



PRENANTHES L. (Rattlesnake-Root) 



1522 P. RACEMOSA Michx. Gipsy Grove, Dunmore. 



1523 P. ALBA L. (White Lettuce, Rattlesnake-Root.) Gipsy Grove, Dun- 



more. 



1524 P. SERPENTARiA Pursh. (Lion's Foot.) Gipsy Grove, Dunmore. 



1525 P. TRiFOLioLATA Femald. (Gall-of-the-Earth.) Gipsy Grove, Dun- 



more. 



1526 P. ALTissiMA L. Gipsy Grove, Dunmore. 



HIERACIUM L. (Hawkweed) 



1527 H. piLosELLA L. (Mouse-Ear.) Near Lily Lake. Near Elk Moun- 



tain, /. A. Graves. 



1528 H. AURANTiAcuM L. (Orange Hawkweed, Devil's Paint-Brush.) 



This has become a great pest within recent years. 



1529 H. PRATENSE Tausch. (King Devil.) Factoryville, Scranton Golf 



Grounds. 



1530 H. vENosuM L. (Rattlesnake-Weed.) Common. 



1531 H. PANicuLATUM L. Frequent. 



1532 H. MARiANUM Willd. Penobscot, Wilkes-Barre Mountain. 



1533 H. SCABRUM Michx. Frequent. 



1534 H. CANADENSE Michx. Pocono Summit. Occasional elsewhere. 



72 



