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 

 wbiculata Pursh. Habenaria viacraphylla Goldie. 



Shady vtoods. Can. to Virg. W. to Ark. July. %.~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. (^ Gr. in Lye. Ann. 



Fertile woods. Can. to Virg. ? July. %.— 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 

 trom 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 Siem leafy. 



4. P. fiava 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 hiiddle, about half as long as the clavate 

 spur. Orchis Jlava Linn. OfuscecexLS Pursh. Habenaria herbiola Drawn. 

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



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

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

 greenish ; the inner ones greenish- j^ellow. Small Pah-yellow 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. B. dUatata Deck Dot. 1st. Ed. Habenaria hyperborea 

 Drown and H. Huro7iensis Spreng. Orchis hyperborea Pursh. {Gray, I. c.) 



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

 Ark. June, July. %.—Stem 8—20 inches high. Leaves 3—8 inches lone 

 i* lowers numerous, in a loose or close spike, greenish-yellow. 



Not^iern 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 dilatata Pursh. 



Sphagnous swamps. N. Y. Torr. June, July. %.— Stein 1—2 feet high 

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



Small White-flowered Orchis. 

 ** 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 fih- 

 form, incurved, much longer thari-.the ovary. Habenaria blephariglottis 

 Hook. Orchis blephariglottis Willd. ' ' ' 



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

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



