GYNANDRIA. HEXANDRIA. 199 



iicapes many-flowered; flowers yellow, petals spreading-, 

 linear and obtuse, the inner ones much narrower; lip ob- 

 cordate, spreading, obtusely 3-lobed, scarcely the length 

 of the tube. 



An extensive g-enus, exclusively indig'enous to the tro- 

 pical parts of America, with the exception of a few spe- 

 cies in India. 



II.— DIANDRIA. 



622. CYPRIPEDIUM. L. Swartz, R. Brown. 

 Lip ventricose, inflated, saccate. Petals 4, 

 the under one bifid. The column terminating 

 behind in a petaloid lobe. 



Roots fibrous; leaves plaited, rarely radical, with the 

 scape l-flowered, stems leafy, producing from 1 to 3 pur- 

 plish or ) ellow flow ers. 



Species. 1. C. candidian. 2. pm^iflorum. o. piibescens. 

 4- spectabile. 5 arietinum. Petals 5, lip saccately calca- 

 rate, stem leafy. Hab. In Canada. 6. hiimile. Scape 

 leafless, l-flowered; leaves 2, radical. 



Of this singular genus there are 3 other species in Si- 

 beria, 1 in Japan, and 1 in Europe. 



in.— HEXANDRIA. 



623. ARISTOLOCHIA. L. (Birthvvort.) 



Calix none. Corolla of 1 petal, ligulate, with 

 a ventricose base. Capsule 6-celIed, many-seed- 

 ed, inferior. 



Herbaceous or shrubby; stems erect or twining; leaves 

 alternate, mostly cordate and entire, rarely 3-lobed; flow- 

 ers axillary, the tube sometimes recurved. 



Species. 1. A. Sipho. (" Dutchman's Pipe.") 2. to- 

 inentosa. Obs. Stem twining, ascending to the summits of 

 the callest trees; leaves roundish-cordate, beneath villous; 

 peduncles solitary, without bractes; corolla densely villous, 

 adscendent, border Irifid, subequal, greenish-yellow, ori- 



