20 KEY TO PLANTS. 
men fleshy, cartilaginous, or horn-like. 
45, 
45 (a) Embryo at the edge of the albumen (but 
sometimes deeply intruded into it). 
Perianth-segments usually 1-seriate, or 
nearly so, most frequently hairy. Stem 
arising from a rhizome, herbaceous, 
usually leafy. Haemodoraceae. 
(b) Embryo enclosed by the albumen. Peri- 
anth-segments distinctly 2-seriate. Stem 
usually leafless, and arising from a bulb. 
Amaryllideae. 
