( '-ill ) 



mens 1-seriate, more than 5. Ovary generally 

 3-celled; cells 1-2 ovulate. 



1. ^SCUlus L. Buckeye. 

 Polygamous. Calyx irregular, gamosepalous. 



Petals uuguiculate, 5, or by abortion of tlie 

 anterior one, 4. Stamens 6-8, filaments as- 

 cending. Cells of ovary 2-ovulate. Fruit a 

 capsule, generally by abortion l-celled, 1-seed- 

 ed. Leaves palmate, deciduous. — '^j . 



1. M. Californica Nutt. Petals white, 

 tinged with red and yellow. — Common. Sum- 

 mer. 



The seeds contain an active principle not yet 

 sufficiently examined. 



2. Acer Moench. Maple. 



Polygamous. Petals as many as sepals, in- 

 serted into the margin of the lobate, hypogy- 

 nous disc. Stamens 8, inserted with the petals. 

 Ovary 2-celled, 2-lobed; cells 2-ovulate. Fruit 

 a 2-seeded samara. — ^ . Leaves opposite, pal- 

 mately lobed, deciduous. 



1. A. MACROPHYLLUM Pursh. Flowers yel- 

 low. — San Mateo. Marin County. Spring. 



3. Negundo Moench. Box Elder. 



Polygamous. Dioecious. Petals 0. 6 : 

 stamens 4, sometimes 5, opposite to the calyx 

 teeth. 9 : ovary 2-celled, 2-lobed; cells 2-ovu- 



