to acute, with a more or less fleshy-thickened ridge through the center below the 

 middle, 6-14 mm. long, 1.5-3 mm. wide; spur cylindric, filiform or only slightly 

 dilated above the middle, usually slightly exceeding the lip (rarely shorter than 

 the lip), to 1.3 cm. long; column conspicuous, usually variable in size, large for 

 the flower, with a rather broad connective, usually one half the length of the 

 dorsal sepal, 2.5-5 mm. long and wide; capsule obliquely ellipsoid, to 1.5 cm. 

 long. 



In moist or wet soil in mt. meadows, marshes, swamps, bogs, open or dense 

 forests, on stream banks and open seepage, and frequently about springs, in N. M. 

 (Lincoln and Sandoval cos.) and Ariz. (Apache. Navajo, Coconino and Graham 

 COS.), Apr.-Sept.; from Wash., s. to N.M., Ariz., Calif, and Baja Calif. 



Var. brevifolia (Greene) Correll. Leaves very short, ovate, less than 9 cm. 

 long, usually reduced to clasping tubular sheaths. In N. M. (Grant, Lincoln, 

 Socorro and Otero cos.). 



Var. laxiflora (Rydb.) Correll. Flowers small, marked or suff"used with purple; 

 lip 4-7.5 mm. long, fleshy but usually without a central ridge; column about 

 one third the length of the dorsal sepal. In N. M. (Sandoval Co.) and Ariz. 

 (Navajo and Coconino cos.). 



15. Habenaria dilatata (Pursh) Hook. Tall white bog-orchid, tall white 



NORTHERN-ORCHID, FRAGRANT-ORCHID, BOREAL BOG-ORCHID. 



Plant usually strictly erect and tall, glabrous, 1.5-12 dm. tall, sometimes taller; 

 stem slender or stout, leafy; leaves linear to lanceolate or occasionally oblanceolate, 

 obtuse to shortly acuminate, sheathing the stem below, to 30 cm. long and 5.5 

 cm. wide; raceme laxly or densely many-flowered, cylindrical, to 45 cm. long 

 and 3.5 cm. in diameter; floral bracts lanceolate, acuminate, usually incurved 

 and exceeding the flowers; flowers white or yellowish-white or greenish-white; 

 dorsal sepal ovate to elliptic, obtuse, sometimes minutely cucullate at the apex, 

 erect and connivent with the petals to form a hood over the column, 3-nerved, 

 3-7 mm. long, 2.5-4 mm. wide near the base; lateral sepals elliptic-lanceolate to 

 narrowly lanceolate, broadly obtuse to acuminate, 3-nerved, spreading or reflexed, 

 4-9 mm. long, 1-3.5 mm. wide; petals ovate-lanceolate to linear-lanceolate, fal- 

 cate, obtuse to acuminate-attenuate, obliquely dilated at the base, 1- or 2-nerved, 

 connivent with the dorsal sepal, 4-8.2 mm. long, 1.8-4 mm. wide at the base, 

 sometimes lightly notched at the apex and cellular-papillose on the margins; lip 

 variable, rhombic-lanceolate to broadly lanceolate or with a suborbicular base and 

 linear anterior part, usually but not always strongly dilated at the base, obtuse, 

 sometimes minutely erose-ciliate on the margins below the middle, usually pro- 

 jecting outward, 5-10 mm. long, 2-5 mm. wide across the base; spur cylindrical, 

 about equaling the lip in length. 



In moist or wet situations in lowland or alpine meadows, swamps, bogs, 

 marshes, coniferous forests, canyons, on moist seepage slopes and in or along 

 streams and springs, bordering lakes and rarely on dry slopes, in N. M., Apr.- 

 Sept.; Greenl. to Alas., s. to N. J., Mich., Minn., N.M. and Calif. 



16. Habenaria clavellata (Michx.) Spreng. Green rein-orchid, small wood 

 ORCHID. Fig. 359. 



Plant usually small, glabrous, 0.8-4.5 dm. tall; roots slender, fleshy, rarely 

 swollen near the base of the stem: stem somewhat angled and narrowly winged; 

 leaves one or rarely two, expanded about the middle of the stem, obovate- 

 oblanceolate, obtuse, 5-18 cm. long, 1-3.5 cm. wide, reduced above to linear- 

 lanceolate bracts; raceme few- to many-flowered, 2-9 cm. long, 2-3.5 cm. in 

 diameter; floral bracts lanceolate, acuminate. 3-10 mm. long; flowers greenish or 

 yellowish white, with stout spreading pedicellate ovaries which are about 1 cm. 



710 



