ORCHIDACE^E. (ORCHIS FAMILY.) 445 



ually thickened towards the apex, blunt, twee the length of the ovary. Rich woods, 

 under Hemlocks, &c., W. New England to Wisconsin; rather rare, chiefly 

 northward, and southward along the Alleghanies. July. Leaves very smooth, 

 shining above, silvery underneath. Scape l-2 high. 



4. P. Ilotikeri, Lindl. (SMALLER TWO-LEAVED ORCHIS.) Leaves 

 orbicular, spreading (3'-4' broad) ; scape mostly naked (^-l high), bearing 

 10-20 upright sessile yellowish-green flowers in a strict spike; sepals ovate-lanceo- 

 late ; lip lanceolate, pointed, a little incurved, longer than the linear-lanceolate 

 petals ; spur slender, acute, about the length of the ovary (!' long). Woods, Rhode 

 Island to Ohio and Wisconsin. June. 



$ 3. Stem leafy : lip entire (or nearly so), nearly equalling or exceeding the spur: root 

 a cluster of fleshy branches or fibres. 



5. P. bracteata, Torr. (BRACTED GREEN ORCHIS.) Lower leaves 

 obovate, the upper oblong and gradually reduced to lanceolate acute bracts 2-3 

 times the length of the small green flowers ; spike loose ; sepals and linear-lanceolate 

 petals erect ; lip oblong-linear or slightly spatulate, truncate and minutely 2 3-toothed 

 at the tip, more than twice the length of the sac-like somewhat 2-lobed spur. Damp 

 woods ; common northward. June. Stem 6' - 1 2' high, 6-1 2-flowered. ( Eu. "? ) 



6. P. hyperbdrea, Lindl. (NORTHERN GREEN ORCHIS.) Stem very 

 leafy ; leaves lanceolate, erect ; spike densely many-flowered ; lower bracts lance- 

 olate, longer than the (greenish) flowers ; lip and petals lanceolate, somewhat equal, 

 as long as the obtuse spur. (P. Huronensis, Lindl.) Peat-bogs and wet cold 

 woods ; common northward. June, July. Stem 6' - 2 high, strict : crowded 

 spike of small flowers 2'-l long. Lip as long as the sepals, obtusish, entire, 

 not dilated at the base. (Eu. ?) 



7. P. dilatata, Lindl. (NORTHERN WHITE ORCHIS.) Leaves lanceo- 

 late or linear, erect ; spike wand-like, densely or rather loosely-flowered ; bracts 

 linear-lanceolate, mostly shorter than the (white or whitish) flowers ; petals linear- 

 lanceolate ; Up linear-lanceolate from a rhomboid-dilated base, rather obtuse, about 

 the length of the obtuse spur. Cold peat-bogs, &c. ; common northward. 

 June, July. Usually more slender than the last, but often as tall, and too 

 nearly related to it. 



8. P. flava, Gray. (YELLOWISH ORCHIS.) Leaves ovate-oblong or oblong- 

 lanceolate ; the uppermost linear-lanceolate and pointed, passing into the bracts 

 of the elongated raceme ; petals ovate ; lip oblong, obtuse or barely notched at 

 the apex, furnished with a tooth on each side near the base and a small protuberance 

 on the palate, about the length of the sepals, half the length of the club-shaped 

 spur. (Orchis flava, L.I O. virescens, fucescens, herbiola, and bidentata, of 

 authors.) Wet places; common. June -Aug. Stem 10' -20' high; the 

 spike at first dense, -with the bracts longer than the flowers, at length elongated 

 and often loose, with the upper bracts shorter than the flowers ; which are quite 

 small, dull greenish-yellow, drying brownish. 



$ 4. Stem leafy : Up fringed along the sides, undivided, shorter than the spur : ovary 

 taper-beaked: root a cluster of thick and fleshy fibres. 



9. P. cristata, Lindl. (CRESTED ORCHIS.) Lower leaves lanceolate, 

 elongated ; the upper gradually reduced to sharp-pointed bracts, nearly the length 



38 



