ORCHIDACE^E. 233 



6. LIS'TERA, R. Br. TWAYBLADE. 



1. L. eorda'ta, R. Br. Racemes crowded ; pedicels not 

 longer than the ovary. Lip linear, 2-cleft. Column very 

 short. Damp cold woods. 



2. L. eonvallarioi'des, Nutt. Racemes loose and slender ; 

 pedicels longer than the ovary. Lip wedge-oblong, 2-lobed. 

 Column longer than the last. Damp thickets. 



7. CALOPO CiO.\, R. Br. CALOPOGON. 



C. pulehel'lUS, R. Br. Leaf linear. Scape a foot high. 

 Flowers an inch across. Bogs. 



8. ARETHU'SA, Gronov. ARETHUSA. 



A. bulbo'sa, L. A beautiful little bog-plant, bearing a 

 single large flower (rarely 2), with the lip bearded-crested on 

 the face. 



9. FOdO'JflA, Juss. POGONIA. 



P. OphioglOSSOi'des, Nutt. A bpg-plant. Sepals and 

 petals nearly equal and alike. Boot of thick fibres. 



10, CALYP'SO, Salisb. CALYPSO. 



C. borea'lis, Salisb. A beautiful little plant growing in 

 mossy bogs. The lip woolly inside ; the petals and sepals 

 resembling each other, lanceolate, sharp-pointed. Column 

 winged. 



11. MICROS'TYLIS, Nutt. ADDER'S MOUTH. 



1. M. monophyl'lOS, Lindl. Leaf sheathing the base of 

 the stem, ovate-elliptical. Raceme spiked, long and slen- 

 der. Lip long-pointed. Cold swamps. 



2. M. OphioglOSSOi'des, Nutt. Leaf near the middle of 

 the stem, ovate, clasping. Raceme short. Lip 3-toothed. 

 Damp woods, not so common as the last. 



13. LIP'ARIS, Richard. TWAYBLADE. 



I.-. Lcese lii, Richard. Lip yellowish-green, mucronate, 

 shorter than the unequal petals and sepals. Leaves ellip- 

 tical-lanceolate or oblong, keeled. Bogs. 



