400 



MANUAL OF POISONOUS PLANTS 



LEITNERIALES 



Shrubs or trees with entire, petioled, simple leaves; flowers in catkins; 

 staminate flowers subtended by what appears to be a perianth; sepals 3-4; 

 ovary 1 -celled; style slender; endosperm thin. Only one family, the Leitneri- 

 accae, which consists of a single genus Leitneria, with perhaps 2 species. L. 

 floridana occurs in swamps in southern Missouri to Texas and Florida and pro- 

 duces a wood lighter than cork, probably the lightest wood known. 



JUGLANDALES 



Trees with alternate, pinnately-compound leaves ; flowers monoecious, brac- 

 teolate ; the staminate in long drooping catkins ; pistillate solitary or several to- 

 gether ; staminate flowers of 3-many stamens with or without a perianth ; peri- 



Fig. 182. Black Walnut (Jnglans nigra). 1. Flowering branch. 

 2. Staminate Hower before amhesis, enlarged. 3. Staminate 

 flower, enlarged. 4. Perianth of staminate flower, enlarged. 5. 

 Stamen, enlarged. 6. Pistillate flower, natural size. 7. Longitudinal 

 section of pistillate flower, natural size. 8. Leaf, reduced. 9. Win- 

 ter branchlet. 10. Mature fruit. 11. Walnut with husk removed. 

 1, 9, 10, 11, one-half natural size. M. M. Cheney. 



