54 APPENDIX. 



Senecio Crawfordii Britton. Crawford's Squaw-weed. Tullytown. 

 Senecio Balsamitae Muhl. Balsam Groundsel. In dry or rocky soil. 

 Senecio aureus L. Golden Ragwort. In streams and wet meadows. 

 Senecio aureus gracilis (Pursh) Britton. Slender Golden Ragwort. In wet meadows, 



Sellersville. 

 Senecio vulgaris L. Common Groundsel. Sellersville; Andalusia, I. C. Martindale. 

 Arctium minus Schk. Common Burdock. In waste places. 

 Carduus lanceolatus L. Common Thistle. In fields and waste places. 

 Carduus altissimus L. Tall Thistle. Plumsteadville; Sellersville. 

 Carduus discolor (Muhl.) Nutt. Field Thistle. In fields and along fences. 

 Carduus odoratiis (Muhl.) Porter. Pasture Thistle. In fields. 

 Carduus muticus (Michx.) Pers. Swamp Thistle. In swamps and moist soil. 

 Carduus arvensis (L.) Robs. Canada Thistle. A pernicious weed in fields. 

 Centaurea Calcitrapa L. Star Thistle. Near Tullytown. 



