30 Spring Flora of Ohio. 



Pop'-u-lus gran -di- den -ta'-ta Mx. Large-toothed Poplar.— Leaves 



roundish ovate with large and irregular sinuate teeth ; scales cut into 

 5 or (5 unequal small divisions, slightly fringed, 

 b. Pi'tioles terete, bracts not silky. 



Pop'-u-lus het-er-0-phy'l-la L. Downy Poplar: Swamp Poplar. — Leaves 



ovate, crenate, white woolly when young, at length nearly smooth. 



A. Styles ■zvith dilated lobes. 



Pop'-u-lus bal-sam-if -er-a L. Balsam Poplar: Tacamahac. — Buds cov- 

 ered with fragrant resin ; leaves ovate-lanceolate, gradualh- tapering 

 and pointed, crenate ; petioles terete ; stamens 20-30. 



Pop'-u-lus bal-sam-if'-er-a can'-di-cans (Ait.) Gray. Balm-of-Gilead. — 



Like the last, but the leaves broader and more or less cordate; petiole 

 commonl}- hairy. Cultivated. 



Pop'-u-lus mo-nil-if'-er-a Ait. Cottonwood; Carolina Poplar. — Leaves 



broadly deltoid, acuminate, with crenate serratures; petioles flattened^ 

 stamens 00 or more. 



2. Genus SA'-LIX. — Flowers with small glands, stamens mostly 2 

 (2-10) ; buds with a single scale; trees or shrubs. The species are very- 

 numerous and extremely difficult to determine; onh' a few of the 

 commoner ones here given. 



A. Ca/kiiis on short, lateial leafy branches. 



b. Leaves closely serrate 7uith injiexed teeth) 



Sa'-llx ni'-gra Marsh. Black Willow. — Leaves narrowly lanceolate> 

 very long attenuate from near the roundish or acute base to the 

 usually curved tip, greet! both sides. Common and variable. 



Sa'-lix a-myg-da-loi'-des Anders. Amygdaloid Willow. — Leaves lanceo- 

 late or ovate-lanceolate, 2-4 in. long, attenuate cuspidate, pale or 

 glaucous beneath. 



Sa'-lix al'-ba L. White Willow. — Leaves ashy-gray or silk-white on 

 both sides except when old. The variet}- vitellina (L.) Koch, with 

 yellow twigs, is ver}' common. 



Sa'-lix bab-y-lon'-i-ca Tourn. Weeping Willow. — Commonly culti- 

 vated; easily recognized by its pendulous branches and linear lanceo- 

 late leaves, glaucous beneath. 



b. Leaves remotely denticulate ivith projccti>ig teeth) 



