NORTH AMERICAN FLORA 



Leaflets dull, often a little glaucous. 

 Leaflets shining. 

 Leaflets large. 

 Leaflets narrow. 



Leaflets 5-11, linear-oblong to linear-lanceolate. 

 Leaflets 3-5, oblong to oblanceolate. 

 Leaflets broad. 



Ovary and fruit pubescent. 

 Leaflets abruptly acuminate. 



Fruit in a short, compact raceme. 

 Fruit in an elongate panicle or raceme. 

 Leaflets gradually acuminate. 

 Ovary and fruit glabrous. 



Branches and rachis of the leaf hirsute (sometimes gla 

 brous in the first), 

 leaflets thin ; bark flaking off. 

 Leaflets thick ; bark persistent. 

 Branches and rachis of the leaf glabrous. 

 Leaflets 3-5. 

 Leaflets more than 5. 



Leaflets strongly reticulate. 

 Leaflets not strongly reticulate. 

 Leaflets glabrous. 

 Leaflets pubescent. 



Leaflets glabrous above. 

 Fruit oblong in outline. 

 Fruit orbicular in outline. 

 Leaflets pubescent above as well as below. 

 Adult leaflets densely reddish-pubescent. 23 

 Adult leaflets with scanty pubescence 

 above. 

 b. Leaflets toothed. 



Lateral nerves parallel and very prominent. 

 Lateral nerves much less prominent. 

 Leaflets 1-3 pairs. 

 Leaflets acuminate. 

 Leaflets merely acute. 

 Leaflets 5-17 pairs. 



Leaflets 2-4 cm. long, narrowly lanceolate. 28. 



Leaflets 1-1.5 cm. long, oblong. 29. 



2. Petiole and rachis more or less winged. 



Leaves more or less bipinnate. 

 Leaflets large, sometimes 2.5 cm. long, toothed. 

 Leaflets rounded at base. 

 Leaflets acute at base. 

 Leaflets small, 1 cm. long or less. 



Calyx-lobes as long as or longer than the petals ; leaflets glabrous 



beneath. 

 Calyx-lobes shorter than the petals ; leaflets hairy beneath. 

 Leaves simply pinnate. 



a. Leaflets glabrous or nearly so throughout. 

 Leaflets entire. 



Young branches and rachis of the leaf pubescent. 

 Leaflets 2 or 4 pairs, obtuse. 

 Leaflets more than 4 pairs, acute. 

 Young branches and rachis of the leaf glabrous. 

 Leaflets broadly oblong. 



Branches dark, not reddish. 

 Fruit apiculate. 

 Fruit not apiculate. 

 Branches reddish. 



Rachis of the leaf narrowly but distinctly winged. 

 Rachis of the leaf indistinctly winged. 

 Leaflets narrowly oblong to linear. 



Bark of first-year branches reddish. (Lower Californian 



and western Mexican species.) 

 Bark of the first-year branches dark-gray, not reddish. 

 (Central Mexican species.) 

 Leaflets closely set, 3-5 mm. apart ; bark glaucous. 

 Leaflets distinct, 6-8 mm. apart. 

 Leaflets toothed. 



Leaflets short and more or less rounded. 

 Rachis of the leaf dentate. 

 Rachis of the leaf entire. 



Peduncles glabrous ; veins of leaves not prominent. 

 Peduncles pubescent ; veins of leaves prominent. 

 Leaflets elongate, more or less pointed. 



E. multijugum. 



E. Karwinskii. 



E. diversi folium. 

 E. collinuni. 



E. bipinnatum. 

 E. gracile. 



40. E. microphylhtr, 



E. moretense. 

 E. mullifolium. 



43. E. glabri folium. 



44. E.fagaroides. 



45. E. Netsoni. 



