356 Salicaceae Salix 



Capsules 2-3 mm long; stigmas sessile. (See excluded species no. 167, p. 1038.) 



5. purpurea. 



Capsules 6-8 mm long; stigmas stalked. (See excluded species no. 168, p. 1039.) 

 S. viminalis. 



KEY BASED PRIMARILY ON STAMINATE FLOWERS 



Stamens 3 or more (rarely nos. 6 and 7 found here) ; catkins on leafy or at least on 

 bracted stalks. 

 Catkins slender, mostly 8-10 mm wide at the widest diameter and 5-7 cm long; 

 petioles not glandular. 

 Floral bracts generally woolly-pubescent all over the outer face, about 1.5-2 mm 



long; stamens usually more than twice as long as the bract 1. S. nigra. 



Floral bracts generally woolly-pubescent only on the lower half of the outer face, 



usually about 2 mm long; stamens about twice as long as the bract 



2. S. amygdaloides. 



Catkins stouter, mostly 11-13 mm wide at the widest diameter and 2-5 cm long; 

 petioles glandular. 

 Leaves green or slightly glaucous beneath; plants of northern Indiana. 

 Plants flowering from the middle of May to the middle of June. 



Leaves glabrous beneath 4 «S. lucida. 



Leaves somewhat rusty-pubescent beneath 4a. S. lucida var. intonsa. 



Plants flowering after the middle of June 3. S. serissima. 



Leaves whitish beneath; gnarled shrubs of the rocky banks or beds of streams in 



southern Indiana 5. S. longipes var. Wardi. 



Stamens 2 (sometimes 3 or 4 in nos. 6 and 7.) 

 Filaments more or less pubescent. 

 Filaments separate, not fused. 



Filaments usually pubescent half their length (shrubs) 8. S. interior. 



Filaments usually pubescent only at the base (trees). 



Young branchlets and leaves more or less silky 6. S. alba. 



Young branchlets and leaves glabrous or only slightly silky 7. S. fragilis. 



Filaments fused nearly or quite to the anthers. (See excluded species no. 167, 



p. 1038. ) S. purpurea. 



Filaments glabrous, not fused at the base. 



Catkins appearing with or after the leaves on leafy-bracted branchlets, these 

 sometimes very short. 

 Branchlets and leaves densely pubescent, finely glandular-serrate. 



Upper surface of leaves densely silky-pubescent (plants found only along 



Lake Michigan) U.S. adenophylla. 



Upper surfaces of leaves glabrous or sparsely silky 18. S. cordata. 



Branchlets and leaves glabrous or glabrate. 



Leaves entire; low shrubs of a bog habitat. .15. S. pedicellaris var. hypoglauca. 

 Leaves closely glandular-serrate; shrubs also of a wet or boggy habitat, mostly 



in the dune area 19. S. glaucophylln. 



Catkins appearing with or after the leaves, sessile or subsessile, without bracts 

 or with 1-3 small ones at the base. 

 Branchlets of previous year puberulent, at least at the summit. 

 Anthers red. 



Leaves impressed-nerved above. 



Leaves woolly-pubescent above 16. S. Candida. 



Leaves glabrous or glabrate above 16a. S. Candida var. denudata. 



Leaves not impressed-nerved above 12. S. humilis. 



Anthers yellow. 



Bracts of flowers of a uniform, light color 14. S. Bebbiana. 



Bracts of flowers with darkened tips. 



Anthers (dry) about 0.9 mm long 9a. S. discolor var. latifolia. 



Anthers (dry) usually less than 0.8 mm long. 



