MONOCOTYLEDONS. 19 
3, filiform or dilated, more rarely short, 
or only 1. Trideae. 
(6) Stamens alternate with the outer or only 
(3) segments of the perianth. Anthers 
introrse, dehiscing longitudinally or 
transversely. Embryo at the edge of a 
fleshy albumen, or without an albumen. 
43. 
43 (a) Anthers dehiscing longitudinally. Style 
and stigma entire. Ovules in each cell 
of the ovary 1-6. Seeds albuminous. | 
Perianth-segments 6, distinct, equal in 
size, or the outer segments smaller. 
Africa, America, Australia. 
Haemodoraceae. 
(b) Anthers dehiscing transversely. Style 
shortly 3-fid. Ovules in each cell of the 
ovary numerous. Seeds exalbuminous. 
Burmanniaceae. 
44. (a) Perianth-segments unequal in texture, 
the outer sepaloid, the inner petaloid. 
Albumen mealy. Mostly herbs growing 
upon trees or rocks. Leaves usually 
radical, rosulate, and prickly. America. 
Bromeliaceae. 
(b) Perianth-segments all more or less peta- 
loid (but often unequal in size). Albu- 
