212 FLORA OF PHILADELPHIA. 



4. ACALYPHA L. Three-seeded Mercury. 



Staminate and pistillate flowers in separate spikes or racemes; capsule 

 spiny. 1. A. ostryaefolia. 



Staminate and pistillate flowers in the same spike or raceme ; capsule smooth. 

 Plant not glandular; bract palmately many-lqbed, equalling or exceed- 

 ing the staminate spike! 2. A. Virginica. 

 Plant glandular; bract many-cleft, shorter than the spike. 



3. A. gracilens. 



1. Aoaltpha ostryaefolia Eidd. • M. p. 588. Woods. Summer. 



Bucks— Morrisville (P.). 



Mercer — Princeton, Trenton (C). 



2. Aoalypha Virginica L. M. p. 588. Fields and open places. Summer. 



3. Acalypha gracilens A. Gray. M. p. 588. Sandy, dry soil. Summer. 



Bucks— Plumstead, Moyer (P.). Delaware — (P.). Chester— (P:). 

 Gloucester — Mickleton (He.). 



Ricinus communis L. Castor-oil Plant. Cultivated and some- 

 times escaped. Summer. 



5. EUPHOEBIA L. Spurge. 



Glands of the involucre with petal-like appendages: ; , , 



Leaves opposite, inequilateral, their bases inore or less oblique. 



Leaves entire; seeds smooth. 1. E. polygonifolia. 



Leaves serrate or dentate; plants prostrate or spreading. 

 . Seeds gray or white. . :'-< A' ; '■■ !.!!.:■' i)H • 2. E. hirsuta. 



Seeds brown or black. 3. E. maculata. 



Leaves serrate or dentate; plants erect or ascending. ' 



4. E. nutans. 

 Leaves alternate or scattered on the stein except a whorl subtending the 

 umbel. - 



Bracts and leaves' of the umbel small and green; seeds ovoid, 



smooth, sparingly pitted. 5. E. corollata. 



Bracts and leaves of the umbel large, white-margined; seeds ovoid, 

 globose, reticvtlate-tuberculate. 6. E: marginata. 



Glands of the 1 involucre without petal-like appendages. 

 Leaves mostly opposite; herbage glabrous. 

 Plants slender; stems or branches forked. 



Annual; stem branched at the base; leaves, or some of them, 



i oblique at the base. 1. E. polygonifolia. 



Perennial; stems several from » stout root; leaves not oblique 



at the base. 8. E. Ipecacuanhae. 



Plants stout ;' stem usually simple below, topped by* an umbel. ' 



9. E. Lathyria. 

 Leaves mostly opposite; herbage pubescent. 7. E. dentota. 



Leaves alternate or, scattered., 



Leaves serrulate; glands of the involucre oblong, oval, or orbic- 

 ular. 11. E'. BeUoscopia. 

 Leaves entire; glands of the involucres crescent-shaped or reniform. 

 Annual or biennial; seeds pitted. 



Capsules with 2-crested lobes. , 12. E. Peplus. 



Capsules with rounded lobes. 13. E. commutata. 



Perennial. i ; 



Glands reniform or oblong without horns. 



10. E. Darlingtoiim. 

 Glands crescent-shaped, with horns., 14,. E. Cyparissias. 



1. Euphorbia polygonifolia L. M. p. 591. Sandyi shores. Summer. 

 New Jersey— Common. , 



New Castle— Collins, Woodland Beach. 



