490 ORCHIDACE.E. (ORCHIS FAMILY.) 



22. PHYSURUS, liu-hard. 



Sepals free, the lateral spreading, the middle one erect, adhering to the 

 petals. Lip spurred, concave toward the base, dilated above. Column very 

 short. Anther dorsal, beaked. Pollen masses 2, entire, powdery. 



1. P. querceticola, Lindl. Stem ascending; leaves thin, ovate or 

 oblong-ovate, acute, on slender petioles, which are dilated, inembranaceoiis, 

 and sheathing at the base; spike short, oblong, densely flowered; bracts sca- 

 rious, oblong-ovate, mostly shorter than the flowers; sepals and petals oblong, 

 obtuse ; lip concave, ending in a broadly ovate acuminate and recurved point ; 

 spur pouch-like, shorter than the ovary ; stigma 2-lobed. Low shady woods, 

 Florida, and westward. August. Plant tender, 6' -12' high. Leaves and 

 spike 1' long. 



23. LISTERA, R. Br. 



Sepals and petals alike, spreading or reflexed. Lip longer than the sepals, 

 2-cleft. Column short. Stigma with a rounded beak. Anther ovate, attached 

 to the dorsal summit of the column. Pollen masses 2, powdery. Stems low, 

 from clustered fibres, bearing two opposite sessile leaves, and a loose raceme 

 of small greenish flowers. 



1. L. australis, Lindl. Leaves ovate or oblong-ovate, closely sessile; 

 raceme smoothish, few - several-flowered ; bracts minute; lip linear, 3-4 

 times as long as the sepals, deeply 2-cleft, the divisions filiform ; column very 

 short. Wet shady woods, Florida, and northward. July. Stem 4'- 8' high. 

 Leaves '- 1' long. 



2. L. COnvallarioides, Hook. Leaves broadly cordate or roundish ; 

 raceme pubescent, few-flowered ; bracts half as long as the pedicels; lip ob- 

 long-obovate, 2-lobed at the apex, and 2-toothed at the base, twice as long as 

 the sepals ; column manifest. Damp mossy woods, on the mountains of 

 North Carolina. July. Stem 4'- 8' high. Leaves g'- 1' long. 



24. PONTHIEVA, R. Br. 



Sepals and petals nearly alike, the two outer sepals spreading, the upper 

 one connivent with the petals. Petals, like the lip, adnate to the middle of 

 the column. Lip posterior, clawed, ovate, concave, spreading. Column 2- 

 lobed, beaked. Anther dorsal, linear, stalked, 4-celled. Pollen masses 4, 

 linear, powdery. Low herbs, with clustered roots, chiefly broad radical 

 leaves, and greenish flowers on a pubescent scape. 



1. P. glandulosa, R. Br. Leaves many-nerved, oblong, spreading, 

 narrowed into a short petiole ; scape slender, many-flowered ; bracts lanceo- 

 late ; lateral sepals flat. Low shady woods, Florida to North Carolina. 

 Sept. - Oct. Scape 1- 1| high. 



25. CYPRIPEDIUM, L. LADY'S SLIPPER. 



Sepals 3, the two lower ones mostly united into one under the lip, spreading. 

 Petals narrower. Lip large, inflated, and sac-like. Column short, 3-lobed, 

 the two lateral lobes each bearing a 2-celled anther on the under side, the 



