STANDLEY FLOEA OF GLACIER PARK. 317 



the flowers greenish, 1 cm. long; lip linear-lanceolate, entire; spur slender, longer than 

 the lip. 



2. Habenaria orbiculata (Pursh) Torr. Two-leaf bog-orchis. Occasional on the 

 west slope at low altitudes, in deep moist woods, the plants mostly solitary and 

 scattered. B. C. and Wash, to Minn., N. C, and Newf. {Lysias orbiculata Rj'db.) — ■ 

 Stems .30 to 50 cm. high, stout; leaves rounded or oval, 8 to 15 cm. long, rounded at 

 the apex; flowers greenish, in a loose raceme; lip linear, 12 to 15 mm. long. 



3. Habenaria bracteata (Willd.) R. Br. Wet woods at east entrance, Umbach; 

 Duck Lake, Weller. B. C. to N. Mex., N. C, and N. B.; also in Asia. (Coeloglossum 

 bracteatum Pari.) — Stems stout, 15 to 50 cm. high, very leafy; leaves oval to 

 lanceolate, obtuse or acute, 5 to 12 cm. long; raceme dense, leafy-bracted ; flowers 

 greenish; lip 6 to 8 mm. long, the spur less than half as long. 



4. Habenaria unalaschensis (Spreng.) S. Wats. Wood-orchis. Open brushy 

 slopes or in woods, about the foot of Lake McDermott. Alaska to Calif., Colo., and 

 Mont. {Piperia unalaschensis Rydb.)- — Stems slender, 20 to 40 cm. high; leaves 

 oblanceolate, 6 to 15 cm. long, the stem bracted above; flowers numerous, in a long 

 loose spike, gi'eenish white, 8 to 10 mm. long; lip oblong, slightly shorter than the 

 spur. 



5. Habenaria dilatata (Pursh) Hook. White bog-orchis. Common at nearly all 

 altitudes, in wet woods or tliickets, in bogs, or on moist open slopes. Alaska to 

 Calif., N. Mex., Nebr., N. Y., and Lab. {Limnorchis dilatata Rydb.) — Stems stout, 

 20 to 70 cm. high, hollow, very leafy; leaves mostly lanceolate, 6 to 20 cm. long, 

 obtuse or acute; spikes long and dense; flowers about 1.5 cm. long, very fragrant. 



A handsome plant, abundant in many places, and blooming for a long time. 



6. Habenaria stricta (Lindl.) S. Wats. Green bog-orchis. Common at nearly 

 all altitudes, in bogs, wet woods, or thickets, or on wet open slopes. Alaska to 

 N. Mex. and Alta. {Limnorchis stricta Rydb.; L. viridijiora Rydb.) — Stems stout 

 or slender, 20 to 80 cm. high; leaves mostly lanceolate or oblanceolate, 5 to 12 cm. 

 long, obtuse or acute; spikes usually long and loose; flowers green, odorless, 12 to 14 

 mm. long. 



7. Habenaria sparsiflora S. Wats. A few plants at Belton, in sandy thicket along 

 river. Oreg. to Mont., N. Mex., and Calif. {Limnorchis ensifolia Rydb.; L. laxijiora 

 Rydb.) — Stems 30 to 40 cm. high, leafy; leaves lanceolate or oblanceolate, 8 to 12 

 cm. long; flowers about 12 mm. long, greenish. 



21. SALICACEAE. Willow Family. 



Trees or shrubs; leaves alternate, entire or toothed, with stipules; flowers small, 

 greenish, in catkins, the staminate and pistillate flowers on separate plants; sepals 

 and petals none, represented only by a disk or by glands; fruit a capsule; seeds each 

 with a tuft of white hairs. 

 Bractlets of the catkins lobed; stamens usually more than 10; leaves ovate to 



rounded 1. POPULXIS. 



Bractlets entire or minutely toothed; stamens usually 2, sometimes as many as 7; 



leaves usually narrow 2. SALIX. 



1. POPTILUS L. 



Large or small trees, or sometimes shrubs; buds usually resinous; flowers appearing 

 in early spring. 



Petioles flattened ; leaves about as broad as long; bark smooth . . 1. P. tremuloides. 

 Petioles not flattened; leaves longer than broad; bark furrowed, at least on mature 

 trees. 



Capsule hairy 2. P. trichocarpa. 



Capsule glabrous 3. P. hastata. 



