246 



BOTANY AND PHARMACOGNOSY. 



The yellow-flowering Cypripediums of the United States (C. 

 parviflorum and C. parviflorurn puhescens) yield the cypripedium 

 of the Pharmacopoeia (p. 490). The plants are a foot or two 

 high. The leaves are oval or elliptical (in the latter) or 



Fig. 133. Cypripedium parviflorum piibescens. A, flowering plant; B, rhizome seen 

 from above; C, cross-section of a leptocentric mestome strand from the rhizome showing 

 parenchyma (p), hadrome (h), and leptome (1). .'\fter Holm, 



elliptical or lanceolate (C. parviflorum) . In C. puhescens the lip 

 is pale yellow with purple veins, 25 to 50 millimeters long, and 

 possesses a tuft of white, jointed hairs at the throat. In C. parvi- 

 florum the lip is smaller and non-hairy. 



