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- 

 aceae, 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 (Jiiglnns nigra). 1. Flowering branch. 



; laminate iiower before aiuhesis, enlarged. 3. Staminate 

 i'( \vt-r, 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- 

 li-r branchlet. 10. Mature fruit. 11. Walnut with husk removed. 

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



