MICHIGAN ACADEMY OF SCIENCE. 175 



Linum virginianum L. Wild Flax. — In poor and sandy shaded ground 

 near Blackwell Station. T. C. Wheatley. Not noticed elsewhere. L. med- 

 ium (Planch) Britton, stiff yellow flax, not yet noticed in Lambton Co., but 

 found near Port Huron, Mich. 



Oxolidaceae. Wood Sorrel Family. 



Oxalis stricta L. Upright Yellow Wood Sorrel. — Common in dry and 

 sandy ground. Often a weed in gardens and fields. 



Oxalis carnicutata L. Lady's Sorrel. — Common in open dryish ground 

 throughout the county. It appears to the writer that the expert botanists 

 and manual writers do not agree very well as to the species of this genus. 



Geraniaceae. Geranium Family. 



Geranium maculatum L. Wild Cranesbill. — Common in open woods, 

 thickets and fields. 



Geranium robertianum L. Herb Robert. — Occasional in moist woods and 

 thickets. Newton Tripp. Abundant along the banks of the Aux Sables 

 river. 



Geranium carolinianum L. Carolina Cranesbill. — Frequent in poor and 

 sandy open ground. 



Geranium bicknellii Britton. — Reported by Prof. John Macoun as noticed 

 near Sarnia. Apparently rare. Common northward. 



Geranium pusillum Burm. f. Small-flowered Cranesbill. — Frequent on 

 roadsides, in cultivated grounds, and waste places. Often a lawn weed. 



Erodium cicutarium (L.) L'Her. Storksbill. — Frequent about towns and 

 villages as a weed. 



Rutaceae. Rue Family 



Zanthoxylum americanum Mill. Northern Prickly Ash. — Common in 

 damp open woods and thickets, and along banks of streams. 



Simaruhaceae. Quassia Family. 



Ailanthus glandulosa Desf. Tree of Heaven. Ailanthus. — Planted for 

 ornament, escaping, and persisting about towns and villages. Apparently 

 well established. 



Polygalaceae. Milkwort Family. 



Polygala paucifolia Willd. Fringed Polygala. — Frequent and usually in 

 shaded dry sandy ground. 



Polygala polygama Walt. Racemed Milkwort. — Occasional in dry and 

 sandy ground. Noticed in particular on shaded sand dunes along Lake 

 Huron. 



Polygala senega L. Seneca Snakeroot. — Frequent in dry open woods and 

 on hillsides. Abundant at Rock Glen. 



Polygala senega latifolia T. and G. Large-leaved Snakeroot. — Occasional 

 near For(\st. N. Tripp. 



Polygala incamata L. Pink Milkwort. — Abundant in dry prairie-like 

 ground on the delta islands of St. Clair River. Not noticed elsewhere. 



Polygala sanguinea L. Field Milkwort. — Occasional in moist sandy 

 gromid. Abundant in many places on the delta islands of St. Clair River. 

 P. verticillata L., whorled milkwort, and P. verticillata ambigua (Nutt.) 



