CLASS XX. ORDER III. 35I 



pressed in the middle with a double keel underneath, yellow. 

 Stigma rounded. Filaments growing to the sides of the style, 

 projecting over the anthers. — Woods, Vermont, New Hampshire, 

 &c. — On the borders of a remarkable marl pond in Barnard, Ver- 

 mont. — June. — Perennial. 

 Cypripedium spectabile. Wind. Tall Ladies' Slipper, 



Stem leafy; lobe of the style elliptic-heart shaped; 

 outer petals broad-ovate, obtuse ; lip longer than the 

 petals, cleft before. 

 Syn. Cypripedium Canadense. Mr. 



A stout plant about two feet high, the stem and leaves hairy. 

 Leaves oval lanceolate, plaited, exactly resembling those of Ve- 

 ratrum viride. Flowers two or three, large, the lip much inflated 

 and variegated with stripes of purple and white. — In Augusta, 

 Maine ; Woodstock, Vermont. — July. — Perennial. 



§ Subgenus . Petals Jive, lip of the nectary acute. 



Cypripedium arietinum. Ait. Ram's Head. 



Stem leafy; lobe of the style orbicular; petals five, 

 the two lower ones linear lanceolate, deflexed, the two 

 lateral ones linear, spreading, the upper one oblong- 

 ovate, acute; lip as long as the petals, inversely conical. 



Stem six or eight inches high with a few alternate, lanceolate 

 leaves. Flower much smaller than in any of the foregoing spe- 

 cies. Petals greenish brown, the upper one much broadest. 

 Lip small, inflated, acute, reticulated with red and white. It has 

 been compared in shape to a sheep's head, the lateral petals 

 representing the horns. — In Hallowell, Maine. — May. 



HEXANDRIA. 



365. ARISTOLOCHIA. 



Aristolochia Serpentaria. Virginia Snake Root. 



American Medical Botany, PI. xlix. 



licaves heart shaped, oblong, acuminate ; stem flex- 

 uous ; peduncles radical. 



