IN TR OD UC TION. 



13 



4. Spiranthes. Lip ascending and embracing the column 

 below, 2 callosities at the base. Flower somewhat ringent ; 

 sepals and petals all narrow, mostly erect or connivent. 

 Leaves near the bottom or at the base of stem. Roots clustered— 

 tuberous. A twisted spike of numerous small flowers. 



5. latifblia, S. Romanzoviana, S. aruua, S. graminea, S. 

 gracilis, S. simplex. 



5. Listera. Lip flat, spreading or pendulous, 2-lobed at the 

 apex. Sepals and petals nearly alike, spreading or reflexed. 

 A pair of opposite leaves in the middle of the stem. Roots 

 fibrous. A raceme of numerous small flowers. 



L. cordata, L. convallario\des. 



Tribe III. ARET.HUSEjE, MALAXIDE^E, &c. Anther 

 terminal and inverted (except in No. 11) like a lid over the 

 stigma, deciduous. 



* Pollen powdery or pulpy, in 2 or 4 delicate masses : no gland. 



6. Arethusa. Lip bearded, its base adherent to the linear 

 column. Pollen masses 4. Flower ringent , sepals and petals 

 nearly alike, united at base, ascending and arching over the 

 column. Leaf solitary. Scape, from a globular solid bulb, 

 bearing usually a single flower. 



A. bulbbsa. 



7. Pogdnia. Lip more or less crested, free from the club- 

 shaped column. Pollen masses 2. Flower irregular ; sepals and 

 petals separate. A single leaf in the middle of stem, or 

 several either alternate or in a whorl at the summit. Root a 

 cluster of fibres or oblong tubers. Flowers solitary or few in 

 number. 



P. ophioglossdldcs, P. pendida, P. vertillata, P. affinis. 



8. Calopdgon. Lip bearded, stalked, free : column winged at 

 the apex. Pollen masses 4. Flower with the ovary or stalk 

 not twisting, therefore presenting its lip on the upper or inner 

 side. Sepals and petals nearly alike, spreading, distinct. A 



