196 SIXTEENTH REPORT. 



poor sandy ground, in dry open woods, thickets, fields and occasional in 

 damp ground. 



Gnaphalium decurrens Ives. . Clammy Everlasting. — Frequent in poor and 

 sandy groimd. Often growing with the preceding. 



Gnaphalium uliginosum L. Low Cudweed. — Frequent in low ground and 

 on roadsides. Often abundant as a weed in cultivated fields and pastures. 

 G. purpureum L., purple cudweed not yet noticed in Lambton Co., but 

 found near Algonac, St. Clair Co., Mich. 



Inula helenium L. Elecampane. — Frequent on roadsides and in cultivated 

 fields. Noticed also in open dry woods. 



Polymnia canadensis L. Small-flowered Leafcup. — Occasional in damp 

 shaded places. Newton Tripp. 



Silphium terebinthinaceum Jacq. Prairie Dock. — Abundant in spots on 

 Walpole Island. Not noticed elsewhere. 



Iva xanthifolia Nutt. Burweed. Marsh Elder. Occasional in waste 

 places of towns and villages. Noticed by Prof. Macoun at Wallaceburg, 

 Kent Co. About a grain elevator at Point Edward, Dodge. 



Ambrosia trifida L. Great Ragweed. — Occasional as a weed in towns, 

 villages and along railways. 



Ambrosia trifida integrifolia (Muhl.) T. and G. Smaller Ragweed. — 

 Usually growing with the species. 



Ambrosia artemisiaefolia L. Ragweed. — Very common as a weed on road- 

 sides, in gardens and cultivated fields. 



Ambrosia psilostachya DC. Western Ragweed. — Well established in dry 

 sandy ground at Point Edward, having persisted there over five years. 



Xanthium canadense Mill. American Cocklebur. — Common on damp 

 roadsides and in rich moist places. 



Xanthium commune Britton. Common clotbur. — Occasional in open 

 ground. 



Xanthium echinatum Murr. Beach Clotbur. — Frequent in waste places 

 aljout Sarnia and occasional along Lake Huron shore. 



Heliopsis helianthoides (L.) Sweet. Ox-eye. — Common in damp places, 

 on damp roadsides and banks of small streams. 



Rudbeckia hirta L. Yellow Daisy. — Black-eyed Susan. — Very common in 

 dry meadows, dry open places and along railways. 



Rudbeckia laciniata L. Tall Cone-flower. — ^Frequent in low thickets and 

 damp open places. Known in cultivation as golden glow. 



Lepachys columnaris (Sims.) T. and G. Prairie Cone-flower. — In dry 

 ground near the grain elevator at Point Edward. An immigrant from the 

 west. Persisting. 



Helianthus annuus L. Common Sunflower. — Occasionally escaping but it 

 does not sccni to jiersist long. 



HeUanthus petiolaris Nutt. Prairie Sunflower.— Occasional along rail- 

 roads. From the West. 



Helianthus scaberrimus Ell. Stiff Sunflower. — Occasional along railroads 

 and in depot grounds. From the West. 



Helianthus subrhomboideus Rydb. Rhombic-leaved Sunflower. — Along 

 railways and in towns and cities. Recent. Becoming frequent. 



Helianthus occidentalis Riddell, Few-leaved Sunflower.— Occasional along 

 railroads and in waste i)laces. From the West. 



Helianthus giganteus L. Tall Sunflower.— Common in damp places, low 

 thickets anil swampy ground. 



