342 OYNANDRIA HEXANDRIA. [CL. XX. 



Broom, in Ross-shire ; Ravelrig Bog, and bog to the south of Dalma- 

 hoy-hill, near Edinburgh ; sands of Barry, near Dundee. Eng. Rot. 

 vol. xx. pi. 1547. Eng. Fl. vol. iv. p. 49. Ophrys Corallorhiza. 1264. 



DIANDRIA. 



11. CYPRIPE'DIUM. LADIES'-SLIPPER. 



Calyx superior, of three lance-shaped, spreading, coloured leaves, 

 the upper one broadest. Petals two, about the same length, spread- 

 ing, narrow lance-shaped. Nectary spurless, with an inflated, ob- 

 tuse, prominent lip, having an irregular longitudinal fissure above. 

 Filaments two on the style, lateral, oblong. Anthers lateral, ellip- 

 tical. Germen oblong, triangular. Style short, somewhat com- 

 pressed, terminating above the stamens in a dilated lobe ; stigma 

 beneath this lobe, and parallel to it, dilated and flattened. Capsule 

 oblong, angular. Seeds oblong, numerous. Name from Cypris, 

 Venus, and podion, a slipper. 418. 



1. C.Calciolus. Common Ladies' -slipper. Stem leafy; terminal lobe 

 of the style elliptical, obtuse, channelled ; lip somewhat compressed, 



shorter than the petals. Root tuberous, branching : stem a foot high : 



flower solitary, terminal, large, dark-brown. Perennial : flowers in 

 June : grows in woods : has been found in a few places in the north of 

 England only. Eng. Bot. vol. i. pi. 1. Eng. Fl. vol. iv. p. 51. 1265. 



HEXANDRIA. 



12. ARISTOLO'CHIA. BIHTHWORT. 



Calyx superior, of one leaf, tubular, coloured, permanent ; 

 nearly globose at the base, with the limb dilated. Corolla none. 

 Filaments none ; anthers six, sessile, on the outer surface of a 

 notched cup, crowning the germen, two-celled, each cell two- 

 valved. Germen inferior, oblong, angular. Style very short; 

 stigma nearly globular, six-lobed, the summit concave. Capsule 

 large, oval, six-cornered, six-celled, six-valved. Seeds numerous 

 in each cell, triangular. Named from its supposed medical power. 



419. 



1. A. Clematitis. Common Birthwort. Leaves heart-shaped ; stem 



erect ; flowers aggregate, erect. Roots long, slender : stems about 



two feet high, erect, zig-zag, leafy, unbranched: flowers, several from 

 the bosom of each leaf, on simple stalks, pale-yellow. Perennial : 

 flowers in July and August : grows in woods and thickets, and among 

 ruins in the south of England, but is not indigenous, having formerly 

 been cultivated. Eng. Bot. vol. vi. pi. 398. Eng. Fl. vol. iv. p. 53. 



1266. 



