116 KEY TO PLANTS, 
(b) Leaves simple, entire or dentate. Fila- 
ments free or united at the base, rarely 
higher upwards, but then ovules in each 
cell more than 2. 26. 
26 (2) Ovary 3-celled. Anthers bursting length- 
wise. Corolla-lobes valvate, rarely im- 
bricate in aestivation. Shrubs or trees. 
Leaves alternate. Stamens 10. Style 1. 
Styraceae. 
(b) Ovary 4- or more-celled, rarely 2-celled. 
Anthers usually bursting at the top. 
Corolla-lobes imbricate or contorted in 
aestivation. Style 1. E'ricaceae. 
27 (2) Perfect stamens as many as corolla-lobes, 
(2) 3 or more. Flowers usually regular. 28. 
(b) Perfect stamens fewer than corolla-lobes, 
2-4,* rarely as many as corolla-lobes but 
only 2. Flowers usually irregular. 74. 
28 (a) Ovary single and 1-2-celled, or distinct 
ovaries 2. 29, 
(b) Ovary single and 3- or more-celled, or 
distinct ovaries 3 or more. 56. 
* In some Sapotaceae the corolla-lobes, which are equal 
in number (6-8) and opposite to the stamens, are furnished 
each with 2 petaloid appendages of the same size, so that 
there seem to be three times as many corolla-lobes as 
stamens. 
