w MICHIGAN ACADEMY OF SCIENCE. 167 



Brassica juncea (L.) Cosson. Indian Mustard. — Occasional as a weed in 

 gardens and fields. Newton Tripp. 



Brassica nigra (L.) Koch. Black Mustard. — Occasional in towns, villages 

 and fields. 



Brassica campestris L. Rutabaga. — Occasional in towns, villages, and 

 along railways. 



Diplotaxis tenuifolia (L.) DC. Wall Rocket. — Occasional along railroads, 

 and in cities and villages. Recent. 



Conringia orientalis (L.) Dumort. Hare's-ear Mustard.— Occasional about 

 towns and along railways. Recent. 



Sisymbrium officinale (L.) Scop. Hedge Mustard. — Occasional as a weed 

 in towns, villages, gardens, and waste grounds. 



Sisymbrium officinale leiocarpum DC. Smooth-Podded. Hedge Mus- 

 tard. Very common as a weed throughout the county. 



Sisymbrium altissimum L. Tumble Mustard. — Occasional in freight yards 

 and along railways. Not yet a troublesome weed here. 



Hesperis matronalis L. Dame's Violet. — Occasional as a weed. 



Erysimum cheiranthoides L. Worm-seed Mustard. — Frequent on banks 

 of streams, and as a weed in gardens and cultivated fields. 



Erysimum parviflorum Nutt. Small Erysimum. — Occasional in to^^^ls, vil- 

 lages, and along railways. Noticed near the grain elevator at Point Edward. 



Erysimum repandum L. Repand Erysimum. — Near the Grain Elevator at 

 Point Edward. Not persisting. 



Erysimum asperum D. C. Western Wall-flower. — About the grain elevator 

 at Point Edward in sandy ground. Apparently persisting. 



Radicula nasturtium-aquaticum (L.) Britten and Randle. True Water 

 Cress. — Very common in ditches, small streams, and wet places. 



Radicula palustris (L.) Muench. Marsh Cress. — Common in wet places, 

 ditches, and shallow water. 



Radicula palustris hispida (Desv.) Robinson. Hispid Yellow Cress. — 

 Frequent in wet places, especially in wet sand about ponds and along streams. 



Radicula armoracia (L.) Robinson. Horseradish. — Frequent as an escape 

 to wet marshy ground, and long persisting in old cultivated grounds. 



Barbarea vulgaris R. Br. Common Winter Cress. — Occasional in damp 

 ground and along streams. Often a weed. 



Dentaria diphylla Michx. Two-leaved Toothwort.^ — Common in damp 

 rich woods and thickets. 



Dentaria laciniata Muhl. Cut-leaved Toothwort. — Occasional in rich 

 damp woods. Newton Tripp. 



Cardamine bulbosa (Schreb.) BSP. Spring Cress. — Common in wet 

 meadows and springy places. 



Cardamine douglasii (Torr.) Britton. Purple Cress. — Very common in 

 damp rich woods and thickets. 



Cardamine pratense L. Cuckoo Flower. — Frequent in wet grassy places 

 and occasionally around small ponds and along slow streams. 



Cardamine pennsylvanica Muhl. Pennsylvania Bitter Cress. — Frequent in 

 damp rich woods and thickets. Often in water on the grassy bottoms of 

 slow creeks. 



Matthiola bicomis (B. and S.) D. C. Stock Flower. — Plentiful in one 

 place growing in sand on Lake Huron shore near summer cottages. 



Arabis lyrata L. Rock Cress. — Very common on sand ridges not far from 

 Lake Huron shore. 



