38 LEGUMINOS#, (PEA FAMILY.) 
3. NEGUNDO, Mench. Box-ELpER, 
Flowers dicecious. Calyx minute. Petals and disk none. Stamens 4 or 5, Ovary 
and fruit asin Acer. Trees; leaves pinnate; sterile flowers on clustered capillary pedi- 
cels, the fertile in drooping racemes. : 
1. N. Californicum, Torr. & Gr. Usually a small tree; leaves 3-foliolate, villous; 
leaflets ovate or oblong, acute, 3 or 4 inches long, the terminal largest and 3-5-lobed or 
coarsely serrate, the lateral ones coarsely serrate; fruit pubescent; wings slightly 
spreading. : 
In the figure a represents the fruit of Acer ma- 
crophyllum, 6 the wider spreading samara of Acer 
circinatum, and ¢ the closer wings of Negundo © 
Californicum. The first has hairy carpels; the 
second is smooth, and the last slightly hairy. 
Orprr ANACARDIACEHZ is represented 
by the well-knowu Poison Oak or Rhus diversiloba, 
a slender, sometimes climbing, shrub, resembling 
the eastern Rhus toxicodendron, which is also often 
called Poison Oak, but is more commonly known 
as Poison Ivy. The eastern Sumac belongs to the 
same genus. There are three other species of 
Rhus in the State. The Pepper tree (Schinus 
molle), so commonly cultivated as an ornamental 
shade tree, belongs to this order. 
Orprer 20. LEGUMINOSA. 
The single and simple free pistil becoming a legume in fruit, the alternate leaves with 
stipules, and in our genera, the papillionaceous corolla with 10 stamens, mark this order, 
one of the largest and most important in the vegetable kingdom. 
Flowers irregular. Calyx 3-5-cleft or toothed, persistent. Corolla of 5 petals, the 
upper larger and always external, covering the lateral pair in the bud, and these cover- 
ing the lower pair, which are more or less united, forming a keel which encloses the 
stamens and pistil. Filaments 10, rarely 5, commonly united around the pistil, either 
all united or nine and the upper one free. Ovary forming a pod with a single row of 
seeds attached to one side; style usually inflexed or curved. In Cercis the upper petal is 
small and enclosed by the wings. In Amorpha there is but one petal. 
Suborder Ceesalpinez is marked by the upper petal enclosed, and distinct stamens. 
Suborder Mimoseee has regular flowers and usually many conspicuous stamens. 
