490 ouciiidacejE. (orchis family.) 



22. PHYSURUS, lii.l.anl. 



St'piils free, the lateral s|)roailinj;, tlin iiiiddlo one erect, aillieriiig to the 

 j)Ptals. Lij) spurred, concave toward the ba.se, dilated ahove. Coluiuu very 

 short. Autlier dorsal, beaked. I'ollen masses 2, eutire, jxjwdcry. 



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

 ohlong-nvatc, aciUf, on slender petioles, wliidi are dilated, membranaceous, 

 and slicathing at the base; spike sliort, obl(jiig, densely Ho\vere<l ; bracts sca- 

 rious, oblong-ovate, mostly sliorter tlian tlie flowers ; sepals and ])etals oblong, 

 oi)tuse ; lip concave, ending in a broadly ovate acuminate and recurved point; 

 spur ])ouch-like, shorter than the ovary ; stigma 2-lobed. — Low shady woods, 

 Florida, and westward. August. — I'lant tender, G'- 12' high. Leaves aud 

 spike 1' long. 



23. LISTERA, K. Br. 



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

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

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

 from clustered fibres, bearing two opposite sessile leaves, aud 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 ; colunm very 

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

 Leaves i'-l' 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 ^'-1' long. 



24. PONTHIEVA, K. Br. 



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

 one conuivent 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 dor-sal, linear, stalked, 4-celled. Pollen masses 4, 

 linear, powdery. — Low herl)S, 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 slKjrt, S-lobed, 

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



