ORCHID ACE^C, IRIDACE.E. 155 



of the perianth strikinyly marked with 3 dark lines. Lip not lobed. 

 Spur none, but the base of the perianth gibbous. Rich woods: 

 not common. 



13. APLEC'TRUM, Nutt. PUTTY-BOOT. ADAM-AND-EVE. 

 A. hyemale, Nutt. Scape a foot high. Perianth greenish - 

 brown. Rich mould in woods. 



14. CYPRIPE'DIUM, L. LADY'S SLIPPEB. MOCCASIN-FLOWEB. 

 * The three sepals separate. 



1. C. arieti'num, R. Br. (RAM'S-HEAD LADY'S SLIPPER.) The 

 smallest species. Stem slender, 6- 10 inches high, leafy. Leaves 

 3 or 4, elliptical-lanceolate, nearly smooth. Lip only half an inch 

 long, red and whitish veiny, prolonged at the apex into a deflexed 

 point. Swamps ; rare. 



* Two sepals united into one piece under the lip. 



2. 0. parviflo'rum, Salisb. (SMALLER YELLOW LADY'S SLIP- 

 PER.) Stem leafy to the top, 1-3-flowered. Lip yellow, flatlish 

 above, rather less than an inch long. Sepals and petals wavy- 

 twisted, brownish, pointed, longer than the lip. Bogs and wet 

 woods. 



3. C. pubes'cens, Willd. (LARGER YELLOW L.) Lip flat- 

 tened laterally, rounded above, larger than in No. 1, but the two 

 species are not sufficiently distinct. 



4. C. SpectaT)ile, Swartz. (Snowy L. ) Lip very large, white, 

 pinkish in front. Sepals and petals rounded, white, not longer 

 than the lip. Bogs. 



5. C. acau'le, Ait. (STEMLESS L.) Scape naked, 2-leaved at 

 the base, 1-Jlowered. Lip rose-purple, split down the whole length 

 in front, veiny. Sepals and petals greenish. Dry or moist 

 woods, under evergreens. 



ORDER XCVII. IBIDA'CEJE. (!RIS FAMILY.) 



Herbs with equitant leaves and perfect flowers. The 6 petal- 

 like divisions of the perianth in 2 (similar or dissimilar) sets of 3 

 each ; the tube adherent to the 3-celled ovary. Stamens 3, 

 distinct or rnonadelphous, opposite the 3 stigmas, and with 



