170 Karl M. Wiegand and Arthur J. Eames 



The common shrub willow, variable in twigs and foliage and represented by the 

 following varieties: (a) Twigs glabrous or nearly so, strongly ascending; stipules 

 small or obsolete ; leaf blades and petioles glabrous or subglabrous ; young capsules 

 generally green. (/>) Twigs during the first season more or less densely crisp- 

 pubescent, becoming glabrate in fall and winter except sometimes at the nodes, 

 glossy the following spring, more spreading ; stipules larger and more conspicuous ; 

 petioles and lower part of midrib beneath more or less crisp-pubescent ; young capsules 

 generally reddish brown. These two leading variations of S. cordata are about 

 equally common. In the second variety the reversal of the quantity of pubescence 

 from the first to the second season, with the twigs finally more glossy than in var. 

 a, may cause confusion. Occasional hybrids occur between S. cordata and S. sericea 

 (S. subsericea (Anders.) Schneid. See Laubholzkunde 1:65. 1904. Rhodora 11:9. 

 1909. PI. Exsic. Gray., nos. 195 and 196. Probably not S. viyricoides Muhl., judging 

 from descriptions by early authors). The capsules in these hybrids are more or less 

 hairy and the young leaves are usually somewhat silky. 



12. S. Candida Flugge. Hoary Willow. 



Swamps and bogs, in calcareous regions ; scarce. Apr. 25-May 10. 



Fleming Meadow (D. !) ; Lake Como (Locke Pond, D.\) : Junius marl ponds 

 (D.) ; larch swamp s. w. of Savannah (D.) ; Spring Lake; Otter Lake; frequent 

 on the Ontario plain. 



Newf. and Lab. to Alberta, southw. to N. J., Pa., and Iowa; rare or absent on the 

 Coastal Plain. 



Hybrids of this species with S. cordata Muhl. occur at Fleming Meadow (see Bui. 

 Torr. Bot. Club. 23: 194. 1896). 



12a. S. Candida Flugge, var. denudata Anders. 



In habitats similar to the preceding ; rare. 



Fleming Meadow, 1894 (A". M. W.) ; arbor vitae swamp e. of Clvde ; Crusoe Lake 

 (K. M. IV., A. J. E., & L. F. Randolph). 



Newf. and Que., to N. Y. and Wis. 



13. S. petiolaris Smith. (S. pctiolaris of Cayuga Fl., in part.) 



Boggy and swampv woods, showing no preference as to type of soil ; infrequent. 

 Apr. 15-May 15. 



Summit Marsh (D. in C. U. Herb.); Michigan Hollow Swamp; Enfield Creek; 

 Newfield ; Woodwardia Bog ; Lowery and Newton Ponds ; Otter Lake ; Westbury 

 Prairie ; Montezuma Marshes. 



N. B. to N. Dak. and Man., southw. to n. N. J. and Tenn. ; probably including the 

 Coastal Plain at the north. 



Occasional plants retain to some extent the silky pubescence of the young foliage. 



According to Dudley, this species occurs in "low grounds and marshes" and is 

 " frequent " ; also such unusual habitats are given as the rather dry alluvial ground 

 of the Fall Creek circus common. Much of Dudley's material, however, as shown 

 by specimens in the C. U. Herbarium and by the stations cited, was S. sericea or 

 hybrids of S. sericea with .S". cordata. 



14. S. sericea Marsh. Silky Willow. 



Swamps and low alluvial soils, showing no further preference as to type of soil ; 

 common. Apr. 20-May 10. 



Abundant about the head of Cayuga Lake, in upper Six Mile Creek valley, and in 

 the McLean region. 



N. B. and N. S. to Mich., southw. to N. C, including the Coastal Plain. 



Hybridizes freely with S. cordata. 



