MONOCOTYLEDONS. 11 
19 (a) Perianth consisting only of petaloid seg- 
(2) ments. 20. 
(6) Perianth consisting of inner petaloid and 
outer sepaloid segments. 26. 
20 (a) Perianth-segments 4. Stamens 1 or 4. 
21. 
(b) Perianth-segments 1-3 or 5-8. Stamens 
2, 3, 5, or more. ye 
21 (a) Leaves sessile, linear or ensiform. Flowers 
irregular. Perianth-segments unequal in 
size, the inner much smaller than the 
outer. Stamen 1. Ovary 1-celled, with 
parietal ovules, or 3-celled. Style fili- 
form. Capsule 3-valved. Austyralia, 
Polynesia, South-east Asia. 
Philydraceae. 
(b) Leaves stalked, lanceolate or cordiform. 
Flowers regular. Perianth - segments 
nearly equal in size. Stamens 4. 
Ovary 1-celled, with basal or apical 
ovules. Style wanting. Capsule 2- 
valved. Australia, South-east Asia, 
Florida. Roxburghiaceae. 
22 (a) Ovaries several, distinct (and with distinct 
styles). 23. 
(b) Ovary 1, entire or lobed. 24, 
23 (a) Saprophytic plants destitute of green 
