Oedee 122.— SALICAOEjB. 651 



i Amenta aa long as the petioles, 9 much shorter. Fruit large, globular. 

 (Pursh. Our specimens in flower.) Mar., Apr. 



2. COMPTO'NIA, Soland. Sweet Fern. (In lionor of ITenry 

 Compton, Lord Bishop of London.) Flowers 8 , $ Ament cylindric ; 

 bract reniform-cordate, acuminate ; calyx-scale 2-parted ; stamens 3, 

 forked, eacli bearing 2 half anthers. ¥ Ament ovate ; calyx-scales 6, 

 longer than the bract ; styles 2 ; nut ovoid, l-ccUed. — Low shrubs. 

 Lvs. long and narrow, pinnatifid-lobed, with small stipules, strongly aro- 

 matic. 



C. aspleiiif61ia Ait. Lvs. long, linear-lanceolate, alternately sinuate-pinnatifld- 

 — A shrub 2f high, common in dry woods and hills. Can. to Md. (Shriver) and 

 "Wis. (Lapham). The main stem is covered with a rusty brown bark which be- 

 comes reddish in the branches, and white downy in the young shoots. Lvs. nu- 

 merous, on short peduncles, 3 to 4' by 6", divided nearly to the midvein into nu- 

 merous rounded lobos so as to resemble those of the Spleenwort. Stip. in pairs, 

 acuminate. Barren flowers in erect, cylindrio catkins, terminal and lateral. Fer- 

 tile fls. in a dense, rounded burr or head, situated below the barren one. Fr. a 

 small, ovate, brown, 1-celled nut. May. 



Order CXXII.— SALICACE^. Willoworts. 



Trees or shrubs with alternate, simple leaves and deciduous or persistent stipules. 

 Flowers S S , both kinds in aments, one under each bract of the ament. Calyx 

 none or cup-form and entire. Ovary 1 to 2 celled, with 2 short styles. Fruit a 

 capsule, 2-valved, oo-seedcd. Seeds with u, coma, and no albumen. lUust. in 

 figs. 4:1, a; 81, 98, 266, 26'7, 268, 269, 465. 



Genera 2, species 220, chiefly natives of the northern temperate and frigid zones, one species, 

 Sfllix avctica, extending farther north than any other known woody plant. 



JProperiief!. — The bark is astringent and tonic possessing the febrifugal properties of the snl- 

 phato of quinia. The wood is employed for various economical purposes. Several of the Wil- 

 lows and Poplars are much admired as shade trees. 



1. SA^LIX, Tourn. Willow. Osier. (Celtic sal, near, and lis, water ; 

 alluding to their usual locality.) Aments cylindric, bracts imbricated, 

 entire, 1-flowered, each with a nectariferous gland at base. S Calyx 

 ; sta. 2 — 7. $ Calyx ; ova. ovoid-lanceolate, acuminate ; stig. 2, 

 mostly bifid ; caps. 1-celled, 2 valved, valves acuminate, finally revolute 

 at summit ; seeds numerous, minute, comous. — Trees, shrubs and under- 

 shrubs. Lvs. usually narrow and elongated, usually with conspicuous 

 stipules. Aments terminal and lateral. 



§ Aments sessile, expandins before tlie leaves in early spring. Stamens 2. Ovaries 

 clothed with wool, siili or down. Shrubs or small trees. (•) 



* Ovaries pedicellate. Leaves subeotire, grayish-downy, rugous, margins subrov- 



olute. Upland grayish shrubs. Aments small Nos. I — S 



* Ovaries pedicellate. Leaves serrulate, smooth and shining above, glaucous be- 



neath. Aments large, very hairy. Shrubs 8 to 15f Nos. 4 — 6 



* Ovaries pedicellate. Leaves serrate, grayish-silky beneatji, drying black. 



Aments with 2 or 8 bracts at base Nos. T, 8 



* Ovaries sessile. Leaves subentire, not drying bhack Nos. 9, 10 



§ Amonts more or less pedunculate, expjinding with the leaves in late spring. Ovaries 



mostly ehabrous. (*). 



* Ovaries clothed with silk or down and pedicellate. Stamens 2. (a) 



a Leaves downy both sides. Ovary long-beaked. Shrub erect No.ll 



a Leaves glabrous when in.aturc. Shrubs low, mostly alpine, spreading. . ,Nos. 12—14 



* Ovaries glabrous. Shrubs alpine, low, creeping or .ascending Nos. 15—17 



■ * Ovaries glabrous. Shrubs erect, or trees. 3 to 60f high, (a) 



a Ovaries pedicellate. Scales greenish-yellow, deciduous, (b) • 



b Stamens mostly 2, sometimes 3. Leaves glaucous beneath Nos. 18,19 



b Stamens mostly 6 (4 to 6). Leaves green on both sides ^os. 20,21 



a Ovaries pedicellate. Scales d.avk or black, persistent, (b) 



h Leaves cordate or .at least truncate at the base, 4 to 15f high Nos. 22, 28 



b Leaves acute or tapering at base. Shrubs 6 to lOf high .Nos. 24,25 



a Ovaries sessile. Stamens 2. Trees of tho largest size Nos. 1.6, 27 



