1911] The Ottawa Naturalist. 117 



Surv. Canada, no. 14822); Lake Osoyoos, 31 May, 1905, /. M. 

 Macoun (hb. Geol. Surv. Canada and hb. Gray, no. ,693 57). 

 This plant was taken at first to represent an undeseribed 

 species; and while it differs from typical 5. Balsamitae Muhl. in 

 being at first floccose-tomentose throughout, and but tardily 

 glabrate, and in having a rather leafy stem, yet these differences 

 do not seem strong enough to merit a specific characterization. 



Senecio manitobensis, sp. nov. 



Herbaceus perennis; caulibus erectis 2-3 dm. altis simplici- 

 bus vel interdum ramosis glabris vel in axillis foliorum subto- 

 mentosis; foliis subcrassis inferioribus petiolatis oblanceolatis 

 27 cm. longis 2-12 cm. latis serratis vel inaequaliter dentato- 

 lobatisbasi sensim angustatis utrinque glabris, foliis superioribus 

 petiolatis vel sessilibus lacinato-pinnatifidis, laciniis angustissimis 

 remotis ; inflorescentiis corymboso-cymosis; capitulis per anthesem 

 8-10 mm. altis ligulatis; involucris campanulatis glabris, squamis 

 vnvolucri plerumque 21 lanceolatis 7 mm. longis acutis glabris 

 quam floribus disci brevioribus; floribus femineis ligulatis 6-10, 

 ligulis flavis; floribus disci 45-60; achaeniis 3-3.5 mm. longis, 

 costis alternis hirtellis. Manitoba: on "sand hills at Brandon 

 and Old Wives Lakes, N.W.T. west of Brandon," 22 June, 1881, 

 /. Macoun, no. 22 (hb. Gray), type; on open prairie, south of 

 Sewell, 12 June, 1876, /. Macoun (hb. Geol. Surv. Canada, no. 

 12232); Gravelly or rocky places, Flat Creek, " N.W.T. ," 20 

 June, 1880, /. Macoun, no. 103 (hb. Geol. Surv. Canada, no. 

 14796); Lake Winnipeg Valley, Bourgeau, coll. of 1857 (hb. 

 Gray); Stewart's Lake Mountain, 21 June, 1875, /. Macoun 

 (hb. Geol. Surv. Canada, no. 14777 in part); north of Carberry, 

 14 June, 1906, J. Macoun and W. Herriot (hb. Geol. Surv. 

 Canada and hb. Field Museum, no. 69753); on sand hills, eight 

 miles west of Petrel, 17 June, 1906, /. Macoun and W. Herriot 

 (hb. Geol. Surv. Canada and hb. Field Museum, no. 69755), 

 North Dakota: on sand hills, McHenry County, 13 July, 1899, 

 /. Lunell, no. 24 (hb. Gray). 



A species somewhat intermediate between 5. plattensis Nutt. 

 and S. Balsamitae Muhl. It is distinguished from the former 

 by the narrowly oblanceolate lower leaves and by the glabrous 

 character of stem and foliage. From the latter it is distinguished 

 by the thicker, firmer texture of the foliage, the serrate-dentate 

 basal leaves, and by the pubescence of the achenes. 



Senecio Willingii, sp. nov. 



Herbaceus perennis subglaucentes; caulibus erectis 2.5-3 

 dm. altis glabris striatis foliaceis; foliis oblongo-lanceolatis 3-12 

 cm. longis 0.7-2 cm. latis crenato-serratis vel multipinnato- 



