73 Class V. Order III. 



lance-oblong, serrate, whitish underneath. Mich, 

 abr. 



A common species of Sumach found about fences and bor- 

 ders of fields. Petioles and leaves unarmed and smooth. The 

 flowers are dioecious. The leaves of this and the two fol- 

 lowing species are astringent and used in tanning. Berries 

 crimson, astringent, and acid June, July. 



RHUS TYPHINUM. L. Stag's horn or Velvet Sumach. 



Branches and petioles hairy ; leaves pinnate, 

 of many pairs, hairy underneath ; leafets lance-ob- 

 long, sharply serrate. 



A larger species than the last ; its leafstalks and last years 

 branches covered with thick bristly hair. Bunches of berries 

 crowded, purple, velvet like. I believe this species to be 

 dioecious. In low ground. June. 



The bark and leaves give out a milky juice on being broken, 

 both in this and the other species. 



.RHVS COPALLINUM. L. Mountain or Dwarf Sumach. 



Leaves pinnate, entire ; petioles membranous, 

 jointed. L. 



A smaller shrub than the preceding. The young branch- 

 es and petioles arc downy. Leafets oval-lanceolate, acute, en- 

 tire. Between each pair the petiole spreads out into a broad 

 leafy expansion, contracted at the insertion of the leafets. Flow- 

 ers dioecious. 



RHUS VERNIX. L. Poison dogwood. Swamp Sumach. 



Quite glabrous ; leaves pinnate, of many pairs ; 

 leafets oval, abruptly acuminate, entire ; panicle 

 lax ; flowers dioecious ; fruit smooth. Mich. abr. 



Grows in bunches in wet swamps, where its fine smooth 



