FLORA OF WORCESTER COUNTY. 9 





 ALYSSUM, Tourn. Alyssum. 



*calycinum, L. Occasional. 



CAMELINA, Crantz. False Flax. 



*sativa, Crantz. Occasional. 



NASTURTIUM, R. Br. Water-Cress. 



*officinale, R. Br. True Water- Cress. Common. 



palustre, DC. Marsh Cress. 



* " " var. hispidum, DC. Not rare. 



*Armoracia, Fries. Horseradish. Escaped. 



BARBAREA, R. Br. Winter Cress. 



vulgaris, R. Br. Common Winter Cress. 

 SISYMBRIUM, Tourn. Hedge Mustard. 



*officinale, Scop. Hedge Mustard. Worcester. 



' Prof. Eaton. 

 BRASSICA, Tourn. Mustard. 



*nigra, Koch. Black Mustard. Waste places. 



CAPSELLA, Medic. Shepherd's Purse. 



*Bursa-pastoris, Mcench. Very common. 



THLASPI, Tourn. Pennycress. 



*arvense, L. Field Pennycress. Waste places. Rare. 

 LEPIDIUM, Tourn. Peppergrass. 



Virginicum, L. Wild Peppergrass. Common. 



*ruderale, L. Not common. 



RAPHANUS, Tourn. Radish. 



*Raphanistrum, L. Wild Radish. Lunenburg. 



Mr. Kilburn. 



*sativus, L. Garden Radish. Occasionally spontaneous. 



CISTACE^E. 



HELIANTHEMUM, Tourn. Rock-rose. 



Canadense, Michx. Frost-weed. Common in dry grounds. 



