352 MONOCOTYLEDONOUS PLANTS. 



long, obtuse ; outer segments of the perianth ovate-oblong, acumi- 

 nate ; inner ones very long, linear, contorted ; Tip compressed, shorter 

 than the petals. C. calceolus var. Linn. 



HAB. Woods. Subarc. Amer. to Car. May. U- Stem 13 



feet high. Flowers greenish-yellow, spotted. Leares pubescent. 



Resembles the preceding. 



4. C. spectalnle Swartz : stem leafy ; lobe of the style elliptic-cor- 

 date, obtuse; outer segments of the perianth broad-oval, obtuse; lip 

 cleft before, longer than the perianth. C. canadense Mich. , ; 



HAB. Swamps and bogs. Can. to Car. May, June. 1C. Stem 

 23 feet high. Leaves ovate-lanceolate, plaited, exactly resem- 

 bling those of feratrum viride. Flowers 2 5, very large. Lip 

 white, variegated with stripes of purple. 



5. C. acaule Ait. : scape leafless, 1-flowered; radical leaves 2, ob- 

 long, 'obtuse; lobe of the style roundish-rhomboidal, acuminate de- 

 flexed ; segments of the perianth lanceolate ; lip shorter than the seg- 

 ments, cleft before. C. humile Swartz. 



HAB. Shady woods. Subarc. Amer. to Car. May, June. If. 

 Scape a. foot high. Flower very large ; lip purpre. 



* ARIETINUM. Lip inflated, acute. Lower segments of 

 the perianth not united, (or 5 segments distinct.) 



A. amcricanum Beck : stem leafy ; lobe of the style orbicular ; the 

 two lower segments linear-lanceolate, deflexed j two lateral linear, 

 spreading ; upper one oblong-ovate, acute ; lip as long as the seg- 

 ments, inversely conical. Cypripedium arietinum Ait. 



HAB. Sphagnous. swamps. Montreal, U. C. Fairhaven, Ver. 

 Hallowell, Maine ; rare. "U.Stem 6 & inches high, with 

 few alternate lanceolate leaves. Flowers much smaller than in 



any of the preceding. Flowers greenish-brown. Lip small, 

 acute, reticulated.- I know not, but in the recent divisions of 

 the Orchideous genera, this plant may have been separated from 

 Cypripedium ; if it has not, it certainly should be, as it is so 

 very different from all the species of that genus. This sugges- 

 tion was first made by Dr. Bigelow in his Florula Bostoniensis, 

 and I have ventured to propose the above name, which alludes to 

 f the resemblance of the shape of the flower to a ram's head. 



ORDER CXVII. IRIDEjE. Juss. Lind. 



Perianth tubular, 6-parted, in two often unequal rows. 

 Stamens 3, distinct or monadelphous, opposite the outer seg- 

 ments of the perianth ; anthers 2 celled, bursting outwardly. 

 Ovary 3-celled, cohering with the tube of the perianth ; ovules 

 numerous ; style 1 ; stigmas 3, dilated, often petaloid, and 

 sometimes 2-lipped. Capsule 3-celled, 3-valved, with a locu- 



