Class XXIII, Order I. 375 



438. 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. 



439. NYSSA. Perfect flowers, calyx five parted ; 

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

 Barren flowers, stamens ten. 



440. FRAXINUS. Perfect flowers, calyx none or 

 four parted ; corolla none or four petalled ; stamens 

 two ; pistil one ; capsule flattened ; seeds mostly 

 solitary, pendulous. Fertile flowers, pistil one, lan- 

 ceolate. 



POLYGAMIA. 

 MOW (EC I A. 



433. CELTIS. 



CELTIS OCCIDENTALIS. L. Nettle Tree. 



Leaves ovate, acuminate, unequally serrate, unequal 

 at base, rough on the upper side, hairy underneath ; 

 fruit solitary. 



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

 names of Hoop Ash and Beaver tree, is rare 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 remark- 

 ably oblique at base. Flowers small, whitish. Fruit dark pur- 

 pie, pedunculated, not larger than the whortleberry. May. 



434. ATRIPLEX. 



ATRIPLEX PATULA. L. Spreading Orache. 



Stem herbaceous, spreading ; leaves deltoid-lanceo- 



