ORCHIDACE^E. (ORCHIS FAMILY.) 501 



2. Spur none ; the broadly gibbous somewhat saccate base wholly free from the 



ovary ; flowers large for the genus, purple, unspotted, more expanding. 

 4. C. Striata, Lindl. Plant purplish, stout (6-16' high), bearing 15-25 

 large flowers in a crowded spike, on very short pedicels ; perianth 6 - 1" long ; 

 lip oval or obovate, perfectly entire, concave, barely narrowed at the base, 

 where it bears 1-3 short lamellae ; all the parts of the perianth marked with 

 3 darker nerves; pod oblong (9" long). (C. Macraei, Gray.) Woods, from 

 L. Erie westward along the Great Lakes and to the Pacific. 



/ 7. HEXALECTBIS, Raf. 



Sepals and petals nearly equal, somewhat spreading, several-nerved, not 

 gibbous nor spurred at base, free. Lip obovate, with 5-6 prominent ridges 

 down the middle, 3-lobed above, the middle lobe somewhat concave. Pollen- 

 masses 8, united into a single fascicle. Otherwise as in Corallorhiza. (Name 

 probably from e|, six, and d\KTpv(av, a cock, from the crests of the lip.) 



1. H. aph^llus, Raf. Stem 1-2 high, beset with purplish scales, the 

 lower sheathing ; flowers racemed, bracteate, brownish-purple, 6 - 8" long. 

 (Bletia aphylla, Nutt.) Rich woods, Ky. and Mo. to Fla. and Mex. 



8. L I S T E R A, R. Brown. TWAYBLADE. 



Sepals and petals nearly alike, spreading or reflexed. Lip mostly drooping, 

 longer than the sepals, 2-lobed or 2-cleft. Column wingless ; stigma with a 

 rounded beak. Anther borne on the back of the column at the summit, erect, 

 ovate ; pollen powdery, in 2 masses, joined to a minute gland. Roots fibrous. 

 Stem bearing a pair of opposite sessile leaves in the middle, and a spike or 

 raceme of greenish or brownish-purple small flowers. (Dedicated to Martin 

 Lister, an early and celebrated British naturalist.) 



* Column very short ; sepals ovate, reflexed ; plants delicate, 4-8' high. 



1. L. cordata, R. Brown. Leaves round-ovate, somewhat heart-shaped 

 (i-1' long) ; raceme smooth; flowers minute, crowded, on pedicels not longer 

 than the ovary ; lip linear, twice as long as the sepals, 1 -toothed each side at 

 base, 2-cleft. Cold woods, N. J. to Mich., Minn., and northward. June. (Eu.) 



2. L. australis, Lindl. Leaves ovate ; raceme loose and slender ; flowers 

 very small, on minutely glandular-pubescent pedicels twice the length of the ovary ; 

 lip linear, 3-4 times the length of the sepals, 2-parted, the divisions linear- 

 setaceous. Damp thickets, Oswego Co., N. Y., and from N. J. to Fla. June. 



* * Column longer, arching or straightish. 



3. L. COnvallarioides, Nutt. Plant 4-9' high; leaves oval or round- 

 ish, and sometimes a little heart-shaped (1 -!-' long) ; raceme loose, pubes- 

 cent; pedicels slender, lip wedge-oblong, 2-lobed at the dilated apex, and 1- 

 toothed on each side at the base, nearly twice the length of the narrowly 

 lanceolate spreading sepals, purplish, J' long. Damp mossy woods, N. New 

 Eng. to Mich., Minn., and northward, and south in the mountains to N. C. 



9. SPIRANTHES, Richard. LADIES' TRESSES. 



Perianth somewhat ringent, oblique on the ovary ; the sepals and petals all 

 narrow, mostly erect or connivent, the three upper pieces sticking together 



