9 4 KEY TO PLANTS. 
tion (sometimes almost wanting), rarely 
connate in the form of acap. Anthers 
dehiscing by 1 pore at the top, rarely by 
2 pores or 1 slit, usually appendaged. 
Stamens perigynous. Leaves usually 
with several longitudinal ribs. 
Melastomaceae. 
(4) Calyx-lobes valvate in aestivation (but 
usually alternating with accessory teeth). 
Anthers dehiscing by 2 longitudinal slits. 
Lythrarveae. 
154 (a) Herbs or undershrubs.* Stamens 4-12. 
155. 
(2) Shrubs or trees. 157. 
155 (a) Stamens perigynous. Styles 2, free, 
rarely 4 sessile stigmas. Leaves per- 
fectly developed. Stamens 4-10. Ovules 
numerous. Saxifrageae. 
(4) Stamens hypogynous. Style 1, undi- 
vided, or styles 4-5, connate above. 156. 
156 (a) Plants destitute of green colour. Leaves 
seale-like, without dots. Ovules in each 
cell numerous. Stamens 6-12. Europe, 
Asia, North America. Monotropeae. 
(4) Plants of a green colour. Leaves per- 
* Compare some Nymphaeaceae with hypogynous sepals, 
but usually epigynous petals, and with numerous stamens. 
