Flowers .21 



(c) Petals, five and equal ; flowers greenish-white or yel- 

 lowish ; seed, one. Sumach Fam. No. 12 (Anacar- 

 diaceae), page 70. 



(f) Petals, five and equal, but lasting only for a day ; flowers 

 light-yellow ; seeds, several. Hudsonia in Rock- 

 Rose Fam. No. 5 (Cistacese), page 42. 

 (c] Petals, five and equal ; flowers white ; seeds, several. 

 Itea in Saxifrage Fam. No. 16 (Saxifragaceae), 

 page 112. 

 () Seed-case with two to several cells. 



(c) Flowers irregular. Rhododendron in Heath Fam. No. 



23 (Ericaceae), page 178. 

 (c) Flowers regular. 



(d) Stamens, two (early, three or four) ; petals, four, 

 barely united at base. Fringe Tree in Olive 

 Fam. No. 24 (Oleaceae), page 190. 



(d) Stamens more numerous than the petals. Maple in 



Soapberry Fam. No. n (Sapindaceae), page 66. 



(d) Stamens just as many or twice as many as the petals. 



(<?) Seeds, only one or two in each cell. 



(/) Leaves compound, of three leaflets. Hop Tree 



in Rue Fam. No. 7 (Rutaceae), page 50. 

 (/) Leaves simple. 



(g) Sepals not minute. Euonymus in Staff- 

 Tree Fam. No. 9 (Celastraceae), page 58. 

 (g) Sepals minute. Holly Fam. No. 8 (Ilici- 



neae), page 50. 

 (<?) Seeds, several or many in each cell. 



(/) Leaves compound and opposite. Bladder-Nut 

 in Soapberry Fam. No. n (Sapindaceae), 

 page 68. 

 (/) Leaves simple, alternate. 



(g) Edge entire. Ledum in Heath Fam. No. 



23 (Ericaceae), page 186. 

 (g-) Edge-toothed. Clethra in Heath Fam. No. 



23 (Ericaceae), page 188. 



Sepals attached to the seed-case. 

 (a) Young seeds, more than one in each cell. 



(Z>) Seed-case with one cell ; leaves alternate. Currant and 

 Gooseberry in Saxifrage Fam. No. 16 (Saxifragaceae), 

 page 114. 



