SALICACBAE (WILLOW FAMILY) 121 



1. Corallorhiza multiflora Nutt. Journ. Acad. Phil. 3; 133. pi. 7. 1823 

 Scape 2-5. dm. high, many-flowered: flowers brownish-purple: sepals am 

 petals 3-nerved; spur manifest, but whjJly adnata to the ovary; lip nearb 

 sessile, 3-lobed by a deep cleft on each side, the middle one rounded or emar 

 ginate, with undulate or denticulate margin: capsule 10-14 mm. long, nar 

 rowed ^p a short raither stout pedicel, (C. ochroteuca Rydb. Bull. Torr. Bol 

 Club 31: 402. . 1904.) — Across the continent in "north temperate latitudes, am 

 in the Rooky Mountains southward to Utah and Colorado. 



2. Corallorhiza innata.R. Br. in Ait. Hort. Kew, Ed. 2. 5: 209. 1813 

 Scape slender, 1-2 dm. high,: 3-15-flowered: sepals and petals 1-nerved, dul 

 purple; spur very short; Up somewhat 3_-lobed by lateral clefts, abruptly at 

 ten,uate to the base; column stout, constricted in the middle: capsule 4-8 mm 

 long,! abruptly narrowed to a short very slender pedicel. — From Colorado t( 

 Washington and thence eastward to Canada and the Atlantic States, am 

 ijflrthward to the Arctic regions. 



3. C;praQprhi;za striata Lindl. Gen. & Sp. Orch. 534., 1840. Scape stout 

 3-6 d^, high, many-flowered: flowers often 12-15 mm. long: spur none, thi 

 lateral sepals and base of the column strongly gibbous over the top of th( 

 ovary: flowers lajjger, purple and veined, not spotted: lip fleshy, entire, some 

 what narrowed below, reflexed above the base and bearing the prominen 

 laminae upon the, arch. (C Vreelandii Rydh. 1. c. 8: 271. 1901.) — Fron 

 Washington and Oregon eastward to the Great Lakes. 



28. SALICACEAE Lindl. Willow Family 



Trees and shrubs with simple^ alternate, stipulate leaves. Flowers dioe 

 cious, arranged in aments (catkins), these falling off as a whole, the staminat( 

 after anthesis, the pistillate after the ripening of the fruit and dispersion o 

 the seeds. Bracts of the ament scale-Uke. Perianth none. Stamens 1 ti 

 several. Ovary iKjelled; stigmas 2. Fruit a 2^valved capsule, inclosing manj 

 seeds furnished With a tuft of hairs at base. 



Bracts^lacerate; flowers with a broad or cup-shaped disk; stamens numerous; 



buds scaly ,,,,,.. . . -. , . . . . . . .1. Pgpulus 



Bracts entire; flo.Tfera with small glands; disks. none; stamens, few; buds with 



a sin^e scale L . ' . . . ' . . . .' . . .2. Sal'ix. 



1. POPULUS L. POPLA.B. Cottonwood. Aspen 



/Deciduous dioecious trees, often low,, with pale furrowed bark, and tereti 

 or angular branchlets.' Leayes varying from broadly deltoid-cordate ,tc 

 narrowly lanceolate. Biids scaly, usually covered with a, resmous ya,rnish 

 Both kinds of flowers in drooping aments appearing before the' leaves; bracti 

 lacerate. Flowers with a ^b^oad''or cup-shaped disk. Stamens numerous 

 Stigmas elongated. Fruit a dehispent, capsule with many aeeds, each bearinj 

 a tuft of white hairs. "'■ ■■■-•-'' ' _ '' ' , ' ' ' 



Petioles flattened laterally. i j . „ 



Leaves suborbicular' , ,. .^ ... ,-,.,. 1. P. tremuloides 



Leavesbi-oad/ more or less deltoid. 



Abruptly acuminate, crenately serrate 2. P. occidentalis 



Gradually acuminate, deeply sinuate-dentate 

 Petioles round or furrowed. 



Leaves pale beneath 



Leaves green, scarcely lighter beneath. 



oblong-lanceolate .■ i ..-,., . ., . . 



Ovate, abruptly long-acuminate 



3. P. Wislizenii. 



4. P. balsamifera, 



5. P. angustifolia, 



6. P. acuminata. 



1. Populus tremuloides Michx. Fl. Bor. Am. 2: 243. 1803. A Small tree, 

 6-20 m. high, usually in. dense groves and rarely attaining the maximum size 

 bark smooth, greenish- white: .leaves small, roundish heart-shaped, with a 



