64 SYNOPSIS OF THE FLORA OF THE 



Ont. (Mis3 Crooks). Jones' Falls, Ont. (Maclagan). Sturgeon Lake, Dawson 

 route (Macoun). Rare. June to August. 



Arabis, L. Wall Cress. Eock Cress. 



A. alpina, L. Alpine Rock Cress. 



Indigenous. Stem branching, somewhat diffused, and, with the leaves, 

 clothed with a villous branched pubescence ; leaves many-toothed ; radical 

 ones somewhat petioled ; cauline cordate, clasping ; peduncles nearly glabrous, 

 longer than the calyx (Hook. Fl. Bor.-Am. I. p. 42). Reported only from the 

 coast of Labrador on Hooker's authority. Forteau Bay, Labrador (Butler). 



A. lyrata, L. E-ock Cress. 



Indigenous. Rocky banks and sandy Mlla along the great lakes. Niagara 

 Falls, whirlpool (Maclagan). Not common, London ? (Saunders). Shore of 

 Lake Huron, at Fishing Islands ; Shore of Lake Superior from Sault Ste. 

 Marie to Pic River ; Lake Shebandowan ; Lake of the Woods ; Fort Assina- 

 boine, on the Athabasca? (Macoun). McLeod Lake, British Columbia, lat. 

 55° N. (Macoun). Pi,are. June, July. 



A. petrsea, Lam. Eock Cress. 



Indigenous. On rocks. Crevices of rocks, about five miles north of Michi- 

 picoten harbour. Lake Superior (Macoun). Cockburn Island, Lake Huron, 

 (Dr. Bell). Canada (Hooker). Arctic America and N. W. Coast (Torr. & 

 Gray). Unalaska (Chamisso). Rare. July. 



A. liirsuta, Scopoli. Hairy Eock Cress. 



Indigenous. Rocky banks and sandy plains. New Brunswick (Dr. Fowler), 

 Moist rocks. Falls of Montmorenci (Brunet). Sea shore, Rivi6re du Loup 

 (Dr. Thomas). Rice Lake plains ; banks of the Moira and Trent ; Owen 

 Sound, Ont ; dry banks up the Kaministiquia, Lake Superior (Macoun). G-alt, 

 Ont. (J. M. Buchan). At Cove, near London (Saunders). Banks of Riviere 

 aux Sables, Co. Lambton, Ont. (Gibson). Saskatchewan plains (Bourgeau). 

 Fort Assinaboine, on the Athabasca ; Dunvegan, on the Peace River (Macoun). 

 Hudson's Bay coast ; shores of the Pacific to Sitka (G. Barnston). May to 

 July. 



A. laevigata, DC. Smootli Eock Cress. 



Indigenous. Rooky woods and low grounds. Rocks, Heeley Falls, Seymour, 

 Co. Northumberland ; Gibson's Mountain, Prince Edward Co. ; Shannonville ; 

 Woods ; Royston Park, Owen Sound (Macoun). London, Ont. (Saunders). 

 Maiden, Ont. (Maclagan). Valley of Rivifere aux Sables, Co. Lambton, Ont. 

 (Gibson). North shore of the St. Lawrence above Quebec (Barnston). June, 

 July. 



A. Canadensis, L. Sickle-pod. 



Indigenous. Rocky hillsides. Laurentian rocks at Shannonville, Ont. ; hills 

 rear of Picton, Prince Edward Co.; woods near Fenelon Falls, Victoria Co. 

 (Macoun). Vicinity of Hamilton (Logie). Maldon, Ont. (Maclagan). Bosanquet 

 Township, Co. Lambton, Ont. (Gibson). Tort Edmonton, north Saskatchewan 

 River (Macoun). June, July. 



A. hesperidoides. Gray. 



Indigenous. Borders of streams. Has only been reported from the vicinity 

 of London, Ont., by Mr. W. Saunders. June. 



