178 GEOLOGICAL SURVEY OF CANADA. 



(Fletcher, Fl. Ott.) Huckleberry Bapids, Argenteuil Co., Q. (Z>' Urban.) 

 Grand Trunk gravel pit, near Prescott, Ont. (Billings.) Yeiy abun. 

 dant on Laurentian rocks, at Shannon ville, and on the bank of the 

 Trent, above the railway bridge, near Trenton, Hastings Co., Ont. ; dry 

 places at Owen Sound ; up the Kaministiqua, near Kakabeka Falls, 

 and on Pie Tsland, Lake Superior. (Macoun.) Vicinity of London, 

 Ont. (Burgess. Millman.) Dry banks, Hamilton, Ont. (Logie.) Plains 

 of the Saskatchewan. (Hooker, Fl.) 



(2697.) P. dichotomum, Linn.; Pursh, Fl. L, 67. 



Bather common in dry or damp thickets and meadows. The typical 

 form is the P. nodiflorum, Lam., and is chiefly found in meadows and 

 on rocks. Newfoundland. (Eeeks.) Common at Bedford, KS. (Macoun.) 

 Glenelg, Guysboro Co., KS. (Faribault.) In dry fields and woods, Kent 

 Co., N.B. (Fowler, Cat.) Quebec. (St. Cyr.) Banks of the Biviere 

 Bouge, Argenteuil Co., Q. (D' Urban.) Tadousac, Q. (A. T. Drum- 

 mond.) Vicinity of Ottawa ; common. (Fletcher, Fl. Ott.) Thickets 

 near Prescott, Ont. (Btllings.) Abundant on dry sandy soil through- 

 out Ontario, extending westward to Owen Sound, and north-west to 

 Sault Ste. Marie, and around Lake Superior to Thunder Bay. (Macoun.) 

 Port Colborne, Ont. (McGill Coll Herb.) Vicinity of Hamilton, Ont. 

 (Logie.) London, Windsor, and Point Pelee, Lake Erie. (Burgess.) 

 Bupert Biver, N.E.T. ; Medicine Hat, Alberta. (J. M. Macoun.) 



Var. nitidum, Lam.; Gray, Man. Ed. V., 649. 



P. nitidum, Lam. ; Michx., Fl. L, 47; Pursh, Fl. L, 67 : ; Hook., Fl. II., 235. 



This is the smooth unbranched form most frequently met with in 

 thickets. St. James, N.B. (Vroom.) Sandy woods, near Belleville, 

 and Owen Sound, Ont. (Macoun.) Throughout Canada to the Sas- 

 katchewan. (Hooker, Fl.) 



Var. pubescens, Gray, Man. Ed, V., 649. 



P.pubescens, Lam.; Michx., Fl. L, 47; Pursh, Fl. I., 68. 

 P. thermale, Boland. Proced. Calif. Acad. II., 181. 



Leaves and sheaths pubescent. Sandy woods, Point Pelde, Lake 

 Erie. (Burgess.) Valley of the Upper Columbia, B.C. (Dawson.) 

 On the higher slopes of Mount Dawson, Boger's Pass, B.C. (Macoun.) 



(2698.) P. GLABRUM, Gaud. Agrost. ]., 22. 



Digitaria glabra, Roem. & Schultz. ; Torr. Fl. L, 154. 

 D. Ischsemum, Schreb. ; Muhl. Gram. 121. 



Introduced chiefly along railways and waste ground about towns. 

 Truro, and Pictou, N".S. (Macoun.) Fredericton, on the railway track; 



