326 Canadian Record of Science. 



the species known to occur in Canada, that a complete 

 revision of the references given by Prof. Macoun in Parts 

 IV. and V. of his catalogue is necessary. Many additional 

 references are also given, and the descriptions of two easily 

 confounded species are copied from Mr. Smith's revision, 

 as it is in the hands of very few Canadian botanists. All 

 our herbarium specimens have been examined by Mr. 

 Smith. 



.S. arifolia, Nutt. in herb. 



S. variablis, var. hastata, Macoun, Cat. Can. Plants, Vol. 

 II., p. 77, forms b and c in part. 



Terrestrial, or emergent aquatic, weak, ascending, 2 to 

 4 dm. high ; petioles rather stout, usually curving outward ; 

 blade of leaf 6 to 12 or 18 cm. long, arrow-shaped, acute, 

 the margin mostly straight or arcuate, basal lobes diverg- 

 ent, acute or acuminate ; scape weak, ascending, simple or 

 rarely branched ; bracts lanceolate, acute, 8 to 20 mm. long, 

 scarious margined and obscurely veined, often renexed ; 



1 to 3 lower verticils pistillate ; fertile pedicels ascending, 

 15 to mostly 25 mm. long, or sometimes almost wanting ; 

 fruiting head round, 8 to 15 mm. in diameter; achenium 



2 mm. long, tumid winged on both margins, the sides 

 smooth, or often with a vertical subepidermal resin passage. 

 Phyllodia of two forms, either long, slender, petiole-like, 

 or flattened, linear-lanceolate, 2 to 5 dm. long and 10 to 

 15 mm. wide. 



Grande Vallee, Gaspe, Que. ; Nipigon Eiver, Ont. ; Hand 

 Hills and Eagle Hills, Alberta ; Sicamous, B.C. ; Kamloops, 

 B.C. (John Macoun.) Manitoba. (Bourgeaa.) Moose 

 Mountain Creek, Assa. (Jas. M. Macoun.)* 



S. cuneata, Sheldon. 



S. variabilis, var. diversifolia, Macoun, Cat. Can. Plants, 

 Vol. II., p. 78, in part. 



* No localities are given in this paper except those from which there are specimens 

 in the herbarium of the Geol. Survey, or which are included in Mr. Smith's revision. 



