MONOCHLAMYDEAE. 29 
26 (a) Stamens more than perianth-leaves. Male 
flowers provided with a  perianth. 
Anthers dehiscing by 3-4 slits. Shrubs 
or trees. Leaves alternate. Flowers 
unisexual, spicate or racemose. Perianth 
of the male flowers 3-4-lobed, valvate in 
bud, of the females imbricate or open. 
Ovule pendulous. Euphorbiaceae. 
(b) Stamens as many as perianth-leaves or 
fewer (very rarely more, but then herbs), 
or male flowers without a perianth. 
Anthers dehiscing by 2 longitudinal 
slits. Fruit indehiscent. Urticaceae. 
27 (a) Perianth imbricate in aestivation. 28. 
(b) Perianth valvate or open in aestivation, 
or wanting. 33. 
28 (a) Perianth-segments 6, rarely fewer (usually 
4), in this case stamens more than 
perianth-segments, but not twice as 
many (usually 6 or 9), and anthers 
generally dehiscing by valves. Stamens 
most frequently 9. 29. 
(b) Perianth-segments 2-5. Stamens as many 
as perianth-segments or fewer or twice 
as many (1-5, 8, or 10). Anthers de- 
hiscing by longitudinal slits. 30. 
29 (a) Anthers dehiscing by recurved valves. 
