CLASS XXIII. ORDER I. 40] 



417. Acer. Calyx five cleft: corolla five petalled; 

 stamens eight ; capsules two or three, one seeded, ter- 

 minated by a wing. Barren flowers without germ or 

 style. 



41S. Nyssa. Perfect flowers, calyx five parted ; 

 corolla none ; stamens five; pistil one ; drupe inferior. 

 Barren flowers, stamens ten. 



419. Fraxinus. Perfect flowers, calyx none or 

 four parted; corolla none or four petalled; stamens 

 two; pistil one ; capsule flattened ; seeds mostly soli- 

 tary, pendulous. Fertile flowers, pistil one, lanceo- 

 late. 



POLYGAMIA. 



MONCECIA. 



412. CELTIS. 

 Celtis occfdentalis. L. Nettle Tree. 



Leaves ovate, acuminate, unequally serrate, une- 

 qual at base, rough on the upper side, hairy under- 

 neath ; fruit solitary. 



This tree, known in some parts of the United States hy the 

 names of Hoop Ash and Beaver tree, is rarely in this vicinity. I 

 have only met with it at Squantum and on Bear hill at Waltham. 

 The leaves are nearly as large as those of the Elm and re- 

 markably oblique at base. Flowers small, whitish. Fruit dark 

 purple, pedunculated, not larger than the whortleberry. — May. 



413. ATRIPLEX. 

 Atriplex patula. L. Spreading Orache. 



Stem herbaceous, spreading; leaves, deltoid-Iance- 

 34* 



