ORCHID A CE.fi. (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 large states seem to pass into S. odorata, Nutt. 



6. L.ISTERA, B. 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. It* COrdata, R. Brown. Leaves round-ovate, somewhat heart-shaped 

 ('-!' long) ; raceme almost smooth, flowers minute, crowded, on pedicels not long- 

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

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

 June, July. (Eu.) 



2. Li. a list rails, 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. Li. convallarioides, 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, J' 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. ARETHIJSA, 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 ; pread- 

 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 Ar&husa.) 



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

 ward : rare. Mav. Flower 1 ' - 2' long, very handsome. 



