ORCHIS. CXL. ORCHID ACE^E. 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, 47' 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. Pursh. (Habenaria. Hook. Platanth. Lindl.) 



St. slender ; 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" locg. 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. Leaf 

 tapering at base, and usually obtuse at the summit, 2 3' 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., Nuttall. 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 of the pedi- 

 cels of the pollinia naked, distinct. 

 * Lip toothed or 3-parted, not fimbriaie. 



8. O. FLAVA. (Habenaria herbiola. I3r. Platanthera. Lindl.) 



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

 rather dense, cylindric; bracts longer than the flowers; Up 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, 12 18' high. Leaves about 3, with long sheaths, 3 6 or 7 by f 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 ; lip linear- 

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



short, inflated, obtuse. A small, green-flowered orchis, in shades. Stem 6 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 2 3, much smaller ; sep. cam- 



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

 filiform, curved, clavate, longer than the ovary. Grows in woods and swamps 

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

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



