308 



THE FLORA. 



Fig. 646. Lady's-slipper {Cypripedium acaule), whole plant, with its 2 leaves, scape, and 

 curious flower. 7. Plan of the flower ; .9, sepals (outer circle), the 2 lower united ; p, the petals ; 

 i,lip (lower petal) ; e, the anthers, upper one sterile ; o, the 3-celled ovary. 8. The column f)een 

 roin beneath, with the pistil, two stamens, and the leaf-like sterile one. 9. Flower and bract of 

 Jrchis spectabilis. Fig. &50. Its 2 pollen masses exhibited (enlarged). 1. Arelhusa bulbosa; yj 

 he flower. 2. Its column enlarged, with its lid-like anther opening, showing its pollen-massca 



b Fls. in the axils of bracts. Pollen masses 2. Lvs. 1-go . Orchis. Orchis. 



b Flowers bnictless. Pollen masses 4. Leaf 1 only. TipuLa. Tipul.\'ria. 

 3 Eootcoralino. Spur growing to the ovary. Lvs. none. Coral-root. Corallorhi'za. 

 c Eoot 2 conns. Spar none. Leaf 1, late, radical. Putty-root. Avi.v.cTv.vm, 



d Flowers 1 only, rose-purple. Lip bearded. Arethusa. Arethu'sa, 



d Fls. racenied, dark-purple, beardless. (Lvs. or few.) Bletia. Bletia. 

 eLeafl. Lip sagittate. Column minute. Micros'tylis. Micros''ttli8. 



e Leaves 2, radical. Lip flat, ascending. Column winged. Liparis. Lip^aris. 

 e Leaves 2, cauline. Lip pendulous, 2-lobed or 2-cleft. Tway-Uade. Listeha 



