198 SIXTEENTH REPORT. 



Artemisia caudata Michx. Tall Wormwood. — Common in sand and on 

 sand ridges along Lake Huron shore. 



Artemisia abrotanum L. Southernwood. — Inclined to escape and persist 

 in poor and sandy grovmd. 



Artemisia ludoviciana Nutt. Western Mugwort. — Frequent in drj- sandy- 

 open ground and along railways. 



Artemisia vulgaris L. Common Mugwort. — Frequent in waste places and 

 along railways. Well established at Point Edward. 



Artemisia pontica L. Hungarian Wormwood. — Well established in sand 

 at Point Edward, but not blooming. Has persisted for over ten years. 



Artemisia stelleriana Bess. Beach Wormwood. — Inclined to escape and 

 persist in sand at Point Edward. 



Artemisia biennis Willd. Biennial Wormwood. — Frequent in damp 

 ground and waste places. From the west. 



Artemisia absinthium L. Wormwood. — Occasional in poor and sandy 

 ground as an escape. 



Artemisia frigida Wllld. Pasture Sage-brush. — Well established near the 

 grain elevator in sandy ground at Point Edward. 



Petasites palmatus (L.) Gray. Palmate-leaf Sweet Coltsfoot.- — Occasional 

 in wet woods, swamps and recent clearings. Newton Tripp. 



Erechtites hieracifolia (L.) Raf. Fireweed. — Common in moist open 

 woods, thickets and recently burned-over ground. 



Cacalia tuberosa Nutt. Tuberous Indian Plantain. — Observed at Rock 

 Glen and along the flood plain of the Aux Sables River. Newton Tripp. 



Senecio vulgaris L. Common Groundsel. — Occasional in waste grounds. 

 T. C. Wheatley. 



Senecio aureus L. Golden Ragwort. — Common in Avet meadows, damp 

 thickets and swamps. 



Senecio aureus gracilis (Pursh.) Britton. Slender Golden Ragwort. — 

 Noticed on Squirrel Island. 



Senecio balsamitae Muhl. Balsam Groundsel. — Common on poor and 

 sandy ground, usually on fixed sand ridges not far from Lake Huron shore. 

 Abundant at Port Franks growing in sand. 



Arctium minus Bernh. Common Burdock. — Common as a weed in gardens, 

 fields, open woods and waste places. 



Circium lanceolatum (L.) Hill. Bull Thistle. — Common in pastures, fields, 

 open woods and thickets. 



Circium pitcheri (Torr.) T. and C. — Pitcher's Thistle. Common on lake 

 shore and sand dunes at Port Franks. Not noticed in other places. 



Circium discolor (Muhl.) Spreng. Field Thistle. — Frequent in rich open 

 ground. 



Circium muticum Michx. Swamp Thistle. — Common in swamjis and 

 marshy open ])laces. 



Circium hillii (Canby) Fernald. Hill's Thistle. — Occasional in prairie-like 

 ground on Squirrel Island, one of the delta islands of St. Clair River. Ap- 

 parently rare. 



Circium arvense (L.) Scop. Canada Thistle. — Common in cultivated 

 grounds, pastures, open woods, thickets and waste places. A pernicious weed 

 in hay and grain fields. 



