90 SALICACEAE. 



2. SALIX L. Willow. 



Trees or shrubs with mostly long narrow usually 

 acute leaves, and persistent or early deciduous broad or 

 minute stipules. Bracts entire or denticulate. Disk 

 gland-like, small or minute. Staminate aments dense, 

 erect, spreading or drooping, their flowers with 1-11 

 stamens with filaments distinct or sometimes united be- 

 low. Pistillate usually erect or spreading; ovary sessile 

 or short-stipitate; style short or filiform, with 2 entire 

 or 2-cleft stigmas. Capsule mostly 2-valved. 



Stamens 3 or more; aments terminating leafy 

 branchlets. 

 Leaves green on both surfaces. 1. S. nigra vallicola. 



Leaves glaucous beneath. 



Petioles with 2 or more prominent 



glands at the base of the blade. 2. S. lasiandra. 



Petioles without glands. 3. S. laevigata. 



Stamens 2. 



Aments subsessile on leafless peduncles, 

 appearing before the leaves in early 

 spring. 

 Capsule glabrous. 4. 5. lasiolepis. 



Capsule hairy. 5. 6". scouleriana. 



Aments terminating leafy branchlets, ap- 

 pearing after the leaves. 

 Stigmas sessile. 



Leaves green, sparsely silky-pubes- 

 cent; stigmas short and thick. 6. 6*. exigua. 

 Leaves silvery, densely silky-pubes- 

 cent; stigmas oblong, about twice 

 as long as thick. 7. S. argophylla. 

 Stigmas on an evident style; leaves 

 silky. 8, S. macrostachya. 



1. S. nigra vallicola Dudley. Tree 8-12 m. high, with dark, 

 rough bark; leaves green on both surfaces, glabrate, narrowly 

 lanceolate, 5-12 cm. long, 8-12 mm. wide, closely serrulate, acute 

 or acuminate, narrowed at base to petioles 4-6 mm. long, which 

 are quite puberulent or nearly glabrous at maturity; stipules lance- 

 olate when well developed, the larger 8-10 mm. long, all glandular 

 toothed, often with similar glands on the lower surface and on the 

 serratures of the young leaves; aments expanding with the leaves, 

 terminating the short lateral branches, the staminate 3-6 cm., the 

 pistillate 2.5-5 cm, long; stamens 5-11, their filaments tomentose 

 below; bracts pale, obovate or roundish, usually very tomentose; 

 style short; stigmas 2, lobed; capsule ovoid, glabrous or more or 

 less pubescent, mostly 4-5 mm, long, from slightly longer to twice 

 the length of the smooth pedicels. 



The largest willow in southern California. Frequent along the 

 Santa Ana River from Santa Ana to San Bernardino; also along the 

 San Dieguito and San Diego Rivers in San Diego County. 



