Orchis. CXL. ORCHIDACEiB 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 — IJ'. Flowers greenish in 

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

 spike. July. 



0. Huroiicnsis. 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, (Habeuarla. Hook. Platanth. Lhidl.') 



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

 linear, about as long as the flowers ; vpper 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 while flowers. Stem 10 — 15' high. Leaves 

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

 4" long. 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; Up linear, entire, with 2 

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

 and ditches, N. H., Storrsl 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 ; sp7ir subulate, longer than the ovary. 

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

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

 fringed. Flowers orange-yellow. Jl. 



^3. Habenaria. Lip dilated, varioush/ divided. Glands of the pedi- 

 cels of the pollinia naked.^ distinct. 

 * Lip toothed err 3-paried, not fivibriate. 



8. O. FLAVA. (Habenaria herbiola. Br. Platanthera. Lindl.') 



St. leafy ; loicer Ivs. oblong, acute, itpper 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 — G or 7' 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. iU«A^. Peristylus bracteatus. Z/mrfZ.) 

 St. lea.fy; Its. oblong, obtuse, upper ones acute; spike lax; bracts 2-— 3 



times as long as the flowers; sep. connivent, ovate ; pet. linear, erect; ^/plinear- 

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

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

 high. Leaves about 3, 18 — 30" by G — 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. Hrok. Gymnadenia. Lindl.) 

 Radical If. solitary, oblong, obtuse, ca.ulim 2 — 3, much smaller ; sep. cam- 



panulate, obtuse, converging ; Up 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. 



