ORCHIDACE^. 347 



lateral ones ovate; lip linear-spatulate, one-half longer than the segments; 

 spur linear-clavate, curved, nearly twice as long as the ovary. Orchis 

 orbiculata Pursh. Habenaria macrophylla Goldie. 



Shady woods. Can. to Virg. W. to Ark. July. TJ.. Scape 1 2 feet high, 

 with several small appressed scales. Leaves 2, radical, nearly orbicular, large, 

 fleshy, spreading on the ground. Flowers greenish- white, in a loose terminal 

 raceme which is sometimes 5 or 6 inches long. Long-leaved Orchis. 



3. P. Hookeri Lind. : outer segments of the perianth ovate-lanceolate, 

 acute or acutish ; inner ones linear, dilated at base, shorter than the outer ; 

 lip lanceolate, acuminate, rather shorter than the ovary. Habenaria Hookeri 

 Torr. <f- Gr. in Lye, Ann. 



Fertile woods. Can. to Virg. ? July. 1]-. Scape 8 12 inches high, some- 

 times with a small lanceolate leaf. Radical leaves 2, nearly orbicular or oval, 

 large, spreading. Flowers 10 20, yellowish-green, in an erect spike. Differs 

 from the preceding, for which it has probably been often mistaken, by its closer 

 spike, projecting spur, and narrow upper perianth-segment. Hooker's Orchis. 



ft Stem leafy. 



4. P. flava Gray : lower leaves oblong, acute, the upper lanceolate ; 

 bracts acuminate, longer than the flowers ; lip oblong, 2-toothed toward the 

 base, and a single tubercle in the middle, about half as long as the clavate 

 spur. Orchis Jlava Linn. Ofuscecens Pursh. Habenaria herbiola Br&ion. 

 H. virescens Spreng. (according to Gray, Sill. Jour, xxxviii.) 



Wet banks of streams. Can to Car. Ij.. Stem 12 18 inches high, with 

 3 5 long clasping leaves. Flowers numerous, in a loose spike ; outer segments 

 greenish; the inner ones greenish-yellow. Small Pale-ydlow Platanthera. 



5. P. hyperborea Lind. : leaves lanceolate, erect ; outer segments of the 

 perianth ovate, the upper one shorter and broader ; inner segments and 

 lip lanceolate, somewhat equal; spur thick and obtuse, about half the 

 length of the ovary. D. dilatata Beck Dot. 1st. Ed. Habenaria hyperborea 

 Brawn and H. Huranensis Spreng. Orchis hyperborea Pursh. (Gray, I. c.) 



Sphagnous swamps. Canvas far N. as Hudson's Bay. N. H. N. Y. W. to 

 Ark. June, July. 1).. Stem 8 20 inches high. Leaves 3 8 inches long. 

 Flowers numerous, in a loose or close spike, greenish-yellow. 



Northern Platanthera. 



6. P. dilatata Lind. : leaves lanceolate ; bracts linear-lanceolate, the 

 lower ones about as long as the flowers ; outer segments of the perianth 

 ovate, obtuse ; lip lanceolate-linear, entire, dilated at the base, about as long 

 as the thick obtuse spur. Orchis dilalata Pursh. 



Sphagnous swamps. N. Y. Torr. June, July. 1\.. Stem 1 2 feet high, 

 angled. Leaves 4 6 inches long. Flowers white, in a long cylindric spike. 



Small White-flowered Orch z".. 



** Lip incised. 



7. P. blephariglottis Lind. : leaves lanceolate, acute ; outer segments of 

 the perianth roundish-oblong, the lateral ones reflexed ; inner segments 

 spatulate, slightly incised at the apex; lip oblong, flat, fimbriate; spur fili- 

 form, incurved, much longer than the ovary. Habenaria blephariglottis 

 Hook. Orchis bkpharigloUis Willd. 



Swamps. Can. to Car. June, July. 1\.Stem 1^2 feet high. Lower 

 leaves 6 8 inches long, the upper gradually smaller. Floicers pure white, in a 



