l6o 44. ORCHIDACEAE — 45. CASUARINACEAE 



Pseudobulbs bearing leaves at the top only, hence not enveloped by sheaths. 

 Lateral sepals forming with the foot of the column a distinct chin. — 

 Species 2. Madagascar. Used as ornamental plants. 



Grammangis Reichb. til. 



92. Pollen-masses attached to a scale-like stalk. Lip spurred, 3-lobed.-- 



Species 2. West Africa. Used as ornamental plants. (Under F.nlophia 



R. Br.) [Tribe MAXILLARIEAE.] .... Eulophidium Pfitz. 



Pollen-masses without a stalk, rarely with a linear stalk. Lip small, not 



distinctly spurred, usually entire. [Tribe BOLBOPHYLLEAE.] 93 



93. Pollen-masses with a stalk. Lateral sepals somewhat longer than the 



dorsal one. Flowers in racemes. Stem creeping. — Species 3. West 

 Africa. (Under Bolbophyllum Thou, or Polystachya Lindl.) 



Genyorchis Schlecht. 

 Pollen-masses without a stalk 94 



94. Lateral sepals much longer than the dorsal one, free at the base, united 



towards the tip. Inflorescence almost umbel-hke. — Species i. Mada- 

 gascar, Mascarenes, East Africa. Used as an ornamental plant. (Under 



Bolbophyllum Thou.) Cirrhopetalum Lindl. 



Lateral sepals shorter or somewhat longer than the dorsal one or equalling 

 it, free or almost so. Flowers in spikes or racemes, rarely solitary. 95 



95. Lateral sepals much shorter than the dorsal one. Inflorescence with a 



dilated, almost leaf-like rachis. — Species 40. Tropical and South-East 

 Africa. Some species are used as ornamental plants. Megaclinium Lindl. 

 Lateral sepals about as long as or longer than the dorsal one. Inflorescence 

 with a cylindrical rachis. — Species 90. Tropical and South-East Africa. 

 Some are used as ornamental plants. {BulbophxUiiin Tliou.) 



Bolbophyllum Thouars 



CLASS V. DICOTYLEDONEAE 



SUBCLASS ARCHICHLAMYDEAE 



(apetai.ae a\d choripetalae) 



ORDER VERTICILLATAE 



FAMILY 45. CASUARINACEAE 



Trees or shrubs. Leaves scale-like, whorled, united into a sheath. Flowers 

 unisexual, the male in spikes, the female in heads. Perianth of the male 

 flowers consisting of two scales, in the female absent. Stamen i. Anther 

 opening by two longitudinal slits. Ovary i-celled. Ovules 2, ascending, 

 straight. Style very short, with 2 thread-shaped stigmas. Fruit dry, inde- 

 hiscent, enclosed by woody bracteoles. Seed i, without albumen. Embryo 

 straight ; radicle superior. 



