92 SALICACEAE. 



Cimarron; chaparrel-covered hills southeast of Ouray; Turkey Creek and 

 tributaries; Fort Collins; Mancos; Garden of the Gods; near Boulder; Rist 

 Canon; banks of the Poudre River; Redstone; Hardin's ranch; Trinidad. 



2. SALIX L. WILLOW. 

 Capsule glabrous. 



Filaments hairy, at least below ; bracts caducous, light yellow. 

 Stamens 3-7 ; stipe slender, 2-5 times as long as the nectaries. 



Petioles without glands; leaves serrulate, thin. I. AMYGDALINAE. 



Petioles with glands ; leaves densely glandular-serrate. 



II. PENTANDRAE. 



Stamens 2 ; stipe very short or none. III. LONGIFOLIAE. 



Filaments glabrous ; bracts persistant, seldom light yellow. 



IV. CORDATAE. 

 Capsule hairy. 

 Filaments hairy. 



Leaf-blades linear to lanceolate not very veiny ; bracts caducous ; tall 



shrubs. III. LONGIFOLIAE. 



Leaf-blades oval or suborbicular, very veiny ; bracts persistent ; depressed 



shrubs. IX. RETICULATAE. 



Filaments glabrous ; bracts more or less persistent. 



Capsule rostrate, distinctly stipitate ; style none or short, always shorter 



than the stipe. 

 Stipe equalling or exceeding the bracts ; styles Yz mm. or less long. 



V. ROSTRATAE. 



Stipe shorter than the bracts ; styles usually about i mm. long. 



VI. BRACHYSTACHYAE. 

 Capsule scarcely rostrate, subsessile or if stipitate, stipe shorter than the 



style. 

 Style evident, at least l /2 mm. long. 



Leaves permanently white-silky or tomentose, at least beneath. 



VII. PELLITAE. 



Leaves either green or grayish beneath. VIII. ARCTICAE. 



Style none ; depressed shrubs with entire strongly veined leaves. 



IX. RETICULATAE. 



I. AMYGDALINAE. 



Leaf-blades narrowly lanceolate; petioles short. i. 5. Wrightii. 



Leaf-blades broadly lanceolate ; petioles slender. 2. S. amygdaloides. 



II. PENTANDRAE. 



Represented only by 3. S. Fendleriana. 



III. LONGIFOLIAE. 

 Capsule glabrous. 



Capsule sessile. 4. S. exigua. 



Capsule stipitate. 



Leaves permanently silky. 



Leaves 3-5 mm. wide ; ovary without hairy swelling at the apex. 



5. 5". luteosericea. 

 Leaves 2-3 mm. wide ; ovary with a hairy swelling at the apex. 



6. 5". stenophylla. 

 Leaves glabrous when mature. 7. 5". linearifolia. 



Capsule more or less pubescent. 



Capsule sparingly silky, often becoming glabrous in age. 

 Leaves permanently silky ; bracts not densely silky. 



5. 5". luteosericea. 

 Leaves glabrous or nearly so when mature ; bracts densely silky ; aments 



dense. 8. S. sessiliflora. 



Capsule densely white-villous ; stigma sessile. 9. 5. argophylla. 



