STANDLEY FLORA OF GLACIER PARK. 315 



Lip petal 10 mm. long or usually shorter; leaves 1 to many. 

 Flower stem finely hairy, especially above, with gland-tipped hairs; leaves 

 green blotched with silvery white, forming a flat rosette at the base of the 



stem 5. PEEAMIUM. 



Flower stems glabrous; leaves not blotched, not in a rosette. 



Flower spikes twisted, the flowers in 3 longitudinal rows ... 6. IBIDIUM. 

 Flower si^ikes not twisted, the flowers not in rows .... 7. HABENARIA. 



1. CORALLORHIZA R. Br. Coralroot. 



Plants glabrous, purplish or yello^vish, with coral-like roots; leaves reduced to 

 scales; flowers in spikes; lip with 2 lobes or teeth below the middle, the spur very 

 small. 



Lip yellowish or whitish, not spotted ; plants yellowish 1. C. innata. 



Lip purple or with purple spots; plants purplish. 



Lip purple; stamen column nearly as long as the petals 2. C. mertensiana. 



Lip white -with purple spots; column half as long as the petals . . 3. C. multiflora. 



1. CorallorMza innata R.Br. Woods at east entrance, Umbach. Alaska to Colo., 

 Ga., and N. S.; also in Eur. (C. corallorrhiza Karst.) — Stems 10 to 30 cm. high, 

 3 to 12-flowered; flowers greenish yellow, about 1 cm. long; spur very small; capsule 

 8 to 12 mm. long. 



2. Corallorliiza mertensiana Bong. Occasional at middle altitudes, in deep woods. 

 Alaska to Calif, and Mont. — Plants 20 to 40 cm. high, stout, often in small colonies; 

 flowers 10 to 20, the spur conspicuous; capsule 1.5 to 2 cm. long. 



3. Corallorhiza multiflora Nutt. Occasional in deep moist woods at low and 

 middle altitudes. Alaska to Calif., Fla., and N. S. — Plants stout, 20 to 50 cm. high; 

 flowers 10 to 30, about 1.5 cm. long; capsule 1.5 to 2 cm. long. 



2. OPHRYS L. TWAYBLADE. 



Plants low, with rootstocks; leaves 2, large and broad, opposite near the middle ol 

 the stem; flowers small, in slender racemes. 

 Lip narrow, deeply cleft, the lobes acute, linear-lanceolate; leaves as broad as 



long 1. O. cordata. 



Lip notched at the apex, the short lobes rounded; leaves usually longer than broad. 



Lips about 5 mm. long, not clawed 2. O. caurina. 



Lip 8 to 9 mm. long, short-clawed 3. O. convallarioides. 



1. Ophrys cordata L. Heartleap twayblade. Frequent on the east slope at 

 middle or low altitudes, in deep moist woods. Alaska to Oreg., N. Mex., Mich., N. J., 

 and Lab.; also in Eur. and Asia. (0. nephrophylla Ptydb.; Listera cordata R. Br.) — 

 Stems 10 to 20 cm. high, glabrous or minutely pubescent above; leaves rounded- 

 reniform, 2 to 4 cm. wide; flowers green, the lip 4 to 5 mm. long. 



2. Ophrys caurina (Piper) Rydb. Small twayblade. Frequent on the east slope 

 at middle altitudes, in deep moist woods. B. C. to Oreg. and Mont. {Listera caurina 

 Piper. )^Stems 10 to 20 cm. high, finely glandular-hairy above; leaves rounded to 

 broadly ovate, 3 to 6 cm. long, sometimes acutish; flowers greenish. 



3. Ophrys convallarioides (Swartz) W. F. Wight. Large twayblade. Common at 

 low and middle altitudes, in bogs, swamps, or deep moist woods. Alaska to Calif., 

 Mich., Vt., and N. S. {Listera convallarioides Torr.) — Stems slender, 10 to 25 cm. high, 

 finely glandular-hairy above; leaves rounded or oval, 3 to 5 cm. long, obtuse or 

 rounded at the apex; flowers pale green. 



