28o Plants and their Ways in South Africa 



allied genera with the differences given in the key. In 

 Disperis and Ceratandra the lip is clawed. Pterygodium has a 



Fig. 252. — Disa jnelaleuca, Sw. Orthopoithea bivalvata (Rolfe), 



sessile lip, and, like that of Disperis^ it is often bent back over 

 the column into the helmet. 



Habenaria is a large genus found chiefly in the East. It 

 may be recognized by the long spur of the three-parted lip and 

 the usually 2 -parted petals. The lip is sometimes entire. 



Stem either leafy at the base or the entire length. Flowers in spikes 

 or racemes, large or small, sometimes quite beautiful, though not bright 

 coloured. Found in February and March. 



Corycium is nearly like Pterygodium, but the two sepals 

 join in front to form a lower lip. The stigmas are two, separate, 

 or one 2-lobed. Capsule usually much narrowed toward the 

 apex. Stem leafy. Leaves flat or crinkled. The genus 

 merges into Pterygodium. 



