Jones: Flora of Illinois, 38. Salicaceae 103 



5. Capsules 7-11 mm. long; shrubs 2-4 m. tall; swamps and bogs, 

 Lake Co. June. Autumn Willow S. serissima (Bailey) Fern. 



4. Ovaries and capsules appressed-silky at first, soon glabrous; leaves 

 linear, subsessile, remotely denticulate; stamens 2; shrub; common 

 along streams. Apr.-June. \_S. longifolia of Muhl., not Lam.} 

 Sandbar Willow S. interior Rowlee 



3. Ovaries and capsules nearly sessile, or very short-pedicelled, glabrous; 

 stamens 2; tree; commonly planted and often spontaneous; introd. 

 from Eur. May. White Willow S. alba L. 



2. Style distinct, 0.5-1 mm. long; ovaries and capsules glabrous. 



7. Catkins slender, 4-7 mm. in diameter at flowering time, 8-18 mm. thick 

 in fruit; stamens 2; tree; nat. of Eur.; often planted, and self-propa- 

 gating from broken branchlets. Apr.-May. Brittle Willow 



S. jragilis L. 



7. Catkins stout, 8-14 mm. in diameter at flowering time, 2-2.5 cm. thick 

 in fruit; stamens 5; style almost 1 mm. long; shrubs; swamps, and 



along streams and lake shores. Shining Willow S. lucida Muhl. 



1. Scales of the catkins brown to black (except S. bebbiana), persistent; sta- 

 mens 2. 

 8. Ovaries and capsules glabrous. 



9. Style 0.5-1.5 mm. long; scales densely silky-villous; young twigs often 

 more or less puberulent; leaves serrate or serrulate. 



10. Flowering catkins appearing before the leaves, sessile or nearly so, 

 subtended by a few bracts; leaves pale green or more or less 

 glaucous beneath, at least at maturity. 



11. Style 0.5 mm. long; capsules 4-7 mm. long, on pedicels 1-2 mm. 

 long; leaves lanceolate, acuminate, becoming glabrous or near- 

 ly so; wet ground, common. Apr.-May S. cordata Muhl. 



11. Style 1 mm. long; capsules 7-10 mm. long, on pedicels 2-4 mm. 

 long; leaves ovate-lanceolate, acute; swamps in the n. third of 



the state. May. Blue-leaf Willow S. glaucophylla Bebb 



10. Flowering catkins on short leafy peduncles 1-2 cm. long; style 0.7- 

 1.5 mm. long; capsules 5-8 mm. long, the pedicels less than 1 

 mm. long; leaves ovate to oval, acute or abruptly acuminate, 

 silky-pubescent, not glaucous; sandy shores, n.e. 111. \_S. syrticola 



Fern.} S. adenophylla Hook. 



9. Style 0.1-0.2 mm. long, the stigmas therefore sessile or nearly so; scales 

 glabrous on the back, pilose within; twigs glabrous; leaves oblanceo- 

 late or elliptical, entire, glaucous beneath; catkins appearing with the 



leaves; bogs and wet meadows, n. 111., rare. Apr.-May 



S. pedicellaris Pursh 



8. Ovaries and capsules pubescent. 



12. Catkins with some small leafy bracts at base, in flower as the leaf-buds 

 are opening. 

 13. Scales yellowish or pink- tipped, thinly villous, shorter than the 

 pedicel; capsules 6-10 mm. long; stigmas nearly sessile; leaves 



