ORDER 137. ORCHIDACE^E. 329 



1 O. FLEXudsuM. Scape panicled, arising from the base of a bulb ; leaves lanceolate ; 



lip 2-lobed, spotted, much longer than the other petals. Brazil. 



2 O. LURIDUM. Scape erect, branched ; leaves elliptical ; lip reniform, not longer than 



the wavy, retuse petals ; flowers large, olive-colored. From S. America. 2f. 



3 O. PAPILIO, has one spotted ovate leaf and large yellow-red butterfly-shaped flowers. 



9. MICROSTYLIS, N. Sepals spreading, petals filiform or linear, lip 

 concave, sessile. Column minute, with 2 teeth or lobes at tip. Pollinia 4. 

 U Root tuberous, with 1 or 2 leaves and small racemed flowers. 



1 OT. opliloglossoides N. St. 5 9>, with a single ovate (2') leaf near the middle , 



rac. short (I'), ped. much longer than the minute whitish flowers. Woods, N. Jnne. 



2 OT. monoph^llus Lindl. St. 2 6', 3-angled, witn a single ovate leaf; rac. elonga- 



ted, 20-40-flowered ; pedicels about as long as the flowers (2"). Woods, N. : rare. Jl. 



10. LIPPARIS, Rich. TWAY-BLADE. Sep. and pet veiy narrow. Lip 

 spreading, flat. Column winged. Pollinia 4, parallel with each other, with- 

 out pedicels or glands. if Root tuberous, with 2 Ivs. and a rac. of greenish fls. 



1 I., lilifolla Rich. Scape about 6'; leaves 2, radical, lance-ovate, 3-4' ; petals fili- 



form, reflexed ; lip purple, 6", abruptly cuspidate ; pedicels 1'. Damp woods. June. 



2 lj. Leeselii Rich. Scape 35', about 6-flowered ; pedicels 2" ; lip 2", oblong, mu 



cronate, incurved, wavy ; sepals and petals linear. Fields, Can. to Penn. June. 



11. LISTERA, Br. TWAY-BLADE. Sep. and pet. subequal, lip pendu- 

 lous, 2-lobed or 2-cleft. Column wingless, anth. dorsal, pollen powdery. 

 '2| Root fibrous. Stem (4 9') with 2 opposite leaves above the middle. 

 Flowers small, racemed. May July, in damp woods. 



1 li. cordala Br. Lvs. roundish, subcordate, acute; fls. 1015, in a short raceme; 



pedicels length of the ovary ; lip-segment linear, length of the sepals. Penn., and N. 



2 L. australis Lindl. Lvs. ovate ; fls. in a loose raceme ; ped. 3 4 times longer than 



the ovary ; lip-segment linear-setaceous, twice the length of the sepals. N. J., and S. 



3 L. convallarioides Hook. Lvs. round-oval; fls. few, loose, on slender pedicels ; 



lip twice the length of the sepals (4"), 2-lobed at the dilated apex. Ga., and N. 



12. SPIRANTHES, Rich. LADIES' TRESSES. Spike spiral. Perianth 

 ringent, the 3 upper pieces ascending and connivent, lip oblong, recurved, 

 channelled, the base embracing the column, and with 2 callous processes. 

 Stigma ovate, beaked, 2-toothed at tip. Anthers dorsal, pollinia 2, each 

 2-lobed, powdeiy. 11 Stem nearly naked, bearing many white flowers, 

 bent to a horizontal position. 



* Spike dense, with the flowers on all sides. Lvs. present with the flowers. .Nos. 1 3 



* Spike slender, flowers all in 1 straight or spiral row. x Lvs. permanent Nos. 4 6 



x Lvs. evanescent Nos. 7, 8 



1 S. cernua Rich. Leaves lance-linear, the upper bract-like ; spike oblong to cylin- 



dric, 2 4' ; lip very obtuse, crenulate-wavy, conduplicate and recurved ; sepals and 

 petals not connivent, 45". Wet. 9 20 7 . Aug. Oct. 



2 S. Romanzoviaiia Cham. Lvs. lance-oblong to linear ; spike dense, 13' ; lip 



much recurved, ovate-oblong, crenulate-wavy ; sepals and petal? all connivent above 

 into a galea. Bogs, Me. (Miss Towle) to Lake Superior (Prof. Porter). July, Aug. 



3 S. latliolia Torr. Loaves nearly radical, 3-5-veined, lance-oblong ; scape bracted, 



4 8' ; flowers small (23') ; plant glabrous. Meadows, Penn., and N. June, July. 



4 S. odorata N. St. stout, l-2f; Ivs. lance-oblong; fls. yellowish, fragrant, 6", in 6 



spiral row, with leafy bracts ; iip 2-toothed at base. Muddy streams, S. October. 



