Classification of Plants 



20 1 



in bundles (pollinia). The three carpels unite to form a single 

 chambered ovary, which is filled with an immense number of 

 ovules. The fruit is an inferior capsule. 



Dr. Bolus mentions that, with all the wonderful provisions for insect 

 pollination, some orchids produce new plants entirely by tubers. This is 

 possibly owing to the dying out of the insects which could effect pollination, 

 owing to bush fires or other causes. The Western orchids are usually 

 tuberous-rooted. Many in the East send up new shoots from creeping 

 rhizomes, the food being sometimes stored in the lower swollen parts of 

 stems. 



II. 



Fig. 201. — I. Floral diagram of Disa. (From Edmonds and Marloth's " Elementary 

 Botany for South Africa.") II. Pollen masses of an orchid joined to a single gland. 

 (From Thome and Bennett's "Structural and Physiological Botany.") 



Key to Some of the Larger Genera of Orchids. 



A. — Anthers lid-like. 



Liparis. — :Pollen masses waxy, without a gland. 

 Pollen masses joined to the rostellum with a gland — 



EnlopMa. — Lip with a short sac or spur. 

 Lip with a long spur — 



Angraecium. — Pollen masses joined to one gland. 

 Mystacidium. — Pollen masses with two glands. 

 A A. — Anthers without a lid. Pollen masses granular, attached to a stalk. 

 Sepals and petals free from each other. 

 Sepals green, lip i -spurred — 

 Bartholina. — Flowers solitary, lip deeply fringed. 

 Holothriz. — Flowers spiked, lip not fringed. 

 Sepals petaloid — 



Satyrium. — Lip at the back, 2-spurred or saccate. 



