ORCHIS. CXL. ORCHIDACEjF- 533 



bracts linear-lanceolate, acute, longer than the flower ; sep. deflexed ; pet. and lip 

 linear, obtuse, subequal, (the latter dilated at base !) and about as long as the 

 pendulous, obtuse spur. A tall, leafy, variable species, found in mountainous 

 woods and open meadows, N. Y. to Mich, and Can. Stems thick, 2 or 3, or 

 even 4 feet high. Leaves lanceolate, 4 7' by 1 1J'-. Flowers greenish in 

 shades, nearly white in open situations, forming a long, more or less dense 

 spike. July. 



/?. Huronensis. More slender; Ivs. lance-oblong and lance-linear, obtuse or 

 acute; spike rather loose, often long. Vt., Dr. Phelps! W. to Mich. 



5. O. DILATATA. PuTsh. (Habenaria. Hook. Platanth. Lindl.) 



St. stender ; Ivs. lanceolate and linear, acute ; spike loose ; bracts lance- 

 linear, about as long as the flowers ; upper sepal ovate, obtuse, the lateral nar- 

 rower and spreading ; lip linear, entire, obtuse, dilated at the base, about equal- 

 ing the petals and a little shorter than the obtuse, incurved spur, which is longer 

 than the ovary. Swamps, Northern States ! (rare) and Can. It is a slender 

 and delicate species, -with pure white flowers. Stem 10 15' high. Leaves 

 often narrow and grass-like, the lower lanceolate. Flowers 10 20, spur about 

 4" loDg. July. 



6. O. OBTUSATA. Pursh. (Platanthera. Lindl. Habenaria. Rich.') 



Lf. solitary, oblong-obovate, obtuse ; st. bearing the leaf near its base ; 

 spike loose ; upper sep. broadest ; pet. subtriangular ; lip linear, entire, with 2 

 tubercles at base, as long as the arcuate, acute spur. Found in muddy ponds 

 and ditches, N. H., Starrs! N. to Lab. Stem slender, angular, 6 8' high, ter- 

 minating in a thin spike of about a dozen small, greenish- white flowers. Leal 

 tapering at base, and usually obtuse at the summit, 23' in length, and 1 in 

 breadth, issuing with the stem from 2 3 radical, sheathing bracts. July. 



7. O. INTEGRA. Nutt. (Habenaria. Spreng.) 



St. leafy ; Ivs. lanceolate and lance-linear ; bracts shorter than the flowers ; 

 lip oblong, entire, longer than the petals ; spur subulate, longer than the ovary. 

 Swamps, N. J., Nuttatt. A species very nearly allied to O. ciliaris, appa- 

 rently differing only in the flowers being smaller; and with the lip entire, not 

 fringed. Flowers orange-yellow. Jl. 



$ 3. HABENARIA. Lip dilated, variously divided. Glands ofthepedi* 

 eels of the pollinia naked^ distinct, 

 * Lip toothed or 3-parted, notjimbriate. 



8. O. FLAVA. (Habenaria herbiola. J3r. Platanthera. Lindl.) 



St. leafy; lower Ivs. oblong, acute, upper lanceolate, acuminate; spike 

 rather dense, cylindric; bracts longer than the flowers; lip oblong, obtuse, den- 

 tate at base ; palate with 1 tuberculate tooth ; spur filiform, rather shorter than 

 the sessile ovary. A small-flowered orchis found in alluvial soil. Stem flexu- 

 ous, 1218' high. Leaves about 3, with long sheaths, 3 6 or T by | 2', taper- 

 ing to an acute summit. Flowers in a long, thin spike. Sepals short, ovate, 

 green. Petals yellowish. Upper bracts about as long as the flowers, lower ones 

 2 or 3 times as long. The tubercle of the lip is a remarkable character. June. 



9. O. VIRIDIS. Swtz. (O. bracteata. Muhl. Peristylusbracteatus. Lindl.) 

 St. leafy ; Ivs. oblong, obtuse, upper ones acute ; spike lax ; bracts 2 3 



times as long as the flowers; sep. connivent, ovate ; pet. linear, erect; Zfylinear- 

 cuneate, truncate, 3-toothed at the end, the middle tooth small or obsolete ; spui 

 short, inflated, obtuse. A small, green-flowered orchis, in shades. Stem (5 9' 

 high. Leaves about 3, 18 30" by 6 12", upper bracts as short as the flower. 

 Spikes 2 3' long. Flowers yellowish-green. Lip as long as the ovary, 3 times 

 as long as the spur. Can. to Va. W. to 111. July, Aug. 



10. O. TRIDENTATA. Willd. ("Habenaria. Hook. Gymnadenia. Lindl.) 

 Radical If. solitary, oblong, obtuse, cauline 23, much smaller ; sep. cam- 



panulate, obtuse, converging; Zy? lanceolate, 3-toothed, at the extremity; spur 

 Ii! i form, curved, clavate, longer than the ovary. Grows in woods and swamps, 

 Can., Mich., Penn., Va. Stem slender, 1- 2f high, with small, greenish-white 

 lowers in a short and rather loose spike, appearing in July. 



