ORCHIDACE^E. (ORCHIS FAMILY.) 449 



8' -2 high, the root leaves 4' -12' long. Spike thick, 3' -5' long, seldom 

 twisted. Flowers white or cream-color, fragrant ; the perianth about 5" long. 

 The la-ge states seem to pass into S. odorata, Nittt. 



6. LISTER A, E. Brown. TWAYBLADE. 



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

 longer than the sepals, 2-lobetl or 2-cleft. Column wingless : stigma with a 

 rounded beak. Anther borne on the back of the column at the summit, 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. cordalat, R. Brown. Leaves round-ovate, somewhat heart-shaped 

 ('- 1' long) ; raceme almost smooth, powers minute, crowded, on pedicels not long- 

 er than the ovary ; lip linear, twice the length of the sepals, 1 -toothed on each side 

 at the base, 2-cle/l to the middle. Damp cold woods ; from Penn. northward. 

 June, July. (Eu.) 



2. L. mist ra 1 is, 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, New Jersey to E. Virginia and southward. June. 



* * Column longer, arching or straightish. 



3. L. I'Oiivallurioitles, Hook. Leaves oval or roundish, and some- 

 times a little heart-shaped (!'-!' long); raceme loose, pubescent; flowers on 

 slender pedicels ; 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 spread- 

 ing sepals, purplish, ' long. (Epipactis convallarioides, Swartz.) Damp 

 mossy woods, along the whole Alleghany Mountains, to Penn., N. New Eng- 

 land, Lake Superior, and northward. Plant 4' -9' high. 



7. AltETIltlSA, Gronov. ARETHUSA. 



Flower ringent ; the lanceolate sepals and petals nearly alike, united at the 

 base, ascending and arching over the column. Lip dilated and recurved-spread- 

 ing towards the summit, bearded inside. Column adherent to the lip below, 

 petal-like, dilated at the apex. Anther lid-like, terminal, of 2 approximate 

 cells: pollen-masses powdery-granular, 2 in each cell. A beautiful low herb, 

 consisting of a sheathed scape from a globular solid bulb, terminated by a single 

 large rose-purple and sweet-scented flower. Leaf solitary, linear, nerved, hidden 

 in the sheaths of the scape, protruding from the uppermost after flowering. 

 (Dedicated to the Nymph Arethusa.) 



1. A bulbosa, L. Bogs, Virginia to Maine, N. Wisconsin, and north- 

 ward: rare. May. Flower .'-2' long, very handsome. 

 38* 



