18 KEY TO PLANTS. 
of the style short and thick, or enlarged 
and petaloid. 39. 
39 (a) Plants destitute of green colour. Leaves 
reduced to scales. Flowers solitary or 
cymose, blue, yellow or white. Stigmas 
short and thick. Seeds exalbuminous. 
America, Polynesia, South Asia, Africa. 
Burmanniaceae. 
(b) Plants of a green colour. Leaves large, 
stalked, usually net-veined. Flowers 
umbellate, of a dark colour. Stigmas 
broad, bipartite, radiating. Seeds albu- 
minous. Stamens 6. Filaments concave. 
Tropics. Taccaceae. 
40 (a) Flowers unisexual. Stem climbing or 
prostrate. Leaves stalked. Ovules in 
each cell of the ovary 2. Seeds with a 
fleshy albumen. 
Dioscoreaceae. 
(b) Flowers hermaphrodite. 41. 
41 (a) Stamens 3. 42. 
(b) Stamens 6 or more. 44,, 
42 (a) Stamens opposite to the outer segments of 
the perianth. Perianth-segments 6. 
Anthers extrorse, dehiscing longitudin- 
ally. Embryo enclosed by a horny 
albumen, Branches of the style usually 
