W'ilh.w Family 99 



1. POPULUS L. Poplar or Cottonwood. 



Trees with scaly resinous buds, terete or angled twigs, 

 and broad or narrow, usually petioled leaves, the stipules 

 minute fugacious. Bracts of the aments fimbriate or 

 incised. Disk cup-shaped, oblique, lobed or entire. 

 Staminate aments dense, pendulous, their flowers with 

 4-60 stamens, with distinct filaments. Pistillate 

 aments pendulous, erect or spreading. Ovary sessile; 

 style short : stigmas 2-4, entire or 4-lobed. Capsule 

 2-4-valved. Coma of the seeds often very long and 

 copious. 



1. P. trichocarpa T. & G. Tree with a broad bead of ascend- 

 ing branches, 8-15 m. high; leaves ovate or oblong-ovate, round- 

 ed at base, acute at apex, serrulate, dark green and shining 

 above, pale beneath, 5-8 cm. long, on terete petioles, 3-5 cm. 

 long ; staminate aments 3-5 cm. long ; disk oblique, bearing 40-60 

 stamens, with purple anthers; pistillate aments 5-7 cm. long, 

 loosely flowered ; ovary hoary tomentose ; capsule 3-valved. 



Frequent in the canyons of all our mountains and sometimes extending 

 down into the valleys. March. 



2. P. Fremonti Wats. Tree with a broad head of wide- 

 spreading branches, 6-15 m. high; leaves deltoid-orbicular, 4-10 

 cm. long, somewhat broader; crenate or sinuate-crenate, abrupt- 

 ly acute at apex, truncate or subcordate at base, green or yellow- 

 ish-green on both surfaces; staminate aments 25-35 mm. long; 

 stamens 60 or more, with dark red anthers ; pistillate aments 5 

 cm. long, loosely flowered; ovary glabrous; capsule on pedicels 

 4 mm. long, minutely rough-tuberculate. 



Rare within our limits. Fernando. Common in the San Bernardino Valley, 

 and in San Diego County south of the San Luis Rey River. 



2. SAL.IX 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 



