43. EUPHORBIACEAE 103 



2. Crotonopsis Michx. 



1. Leaves lanceolate; fruit ovoid; fields and open woods, southern 111. 

 July-Scpt C. cUiptica Willd 



1. Leaves linear-lanceolate; fruit ellipsoid; dry sandy soil, not com- 

 mon; west-central III. July-Sept C. linearis Michx. 



3. Phyllanthus L. 



P. caroliniensis Walt. Sandy soil, locally in the southern two-thirds 

 of the state. May-Oct. 



4. Acalypha L. — Three-seeded Mercury 

 1. Leaves slender-petioled. 



2. Leaves cordate at base, ovate; capsules echinate; staminate and 

 pistillate flowers in separate spikes; roadsides, fields, bluffs, 

 southern Illinois. July-Oct. [A. caroliniana sensu auth., non 



Walt.] A. ostryaefulia Riddell 



2. Leaves cuneate at base, rhombic-ovate to oval; capsules smooth; 

 staminate and pistillate flowers in the same spike. 

 3. Stem with short, cui"ved hairs, or nearly glabrous; bracts of 

 the pistillate flowers 5- to 7-lobed, bearing a few whitish 

 stipitate glands (at least when young), or nearly glabrous. 

 4. Leaves lance- to rhombic-ovate, 2-9 cm long; seeds 1.6-1.8 

 mm long; woods, fields, and roadsides, common. July- 

 Oct. [A. virginica sensu auth., ex p.] ....A. rhornboidea Raf. 

 4. Leaves broadly ovate, 7.5-10.5 cm long; seeds 2.5-3 mm 

 long; river bottoms, rare; Vermilion Co., H. E. Ahles 



6989 in 1952 A. deamii (Weatherby) Ahles 



3. Stem with straight spreading hairs, in addition to the short 

 curved ones; bracts with 9-15 lobes, hispid-pubescent on 

 the veins and margins, not glandular; fields, road.sides, 

 and wooded slopes, local. July-Oct. [A. digyneia Raf.] 



A. virginica L. 



1. Leaves short-petioled (petiole Ys - Y-i the length of the blade), 

 elliptic-lanceolate to lanceolate, or linear; bracts with 9-11 

 ovate to deltoid teeth; stem with short, curved hairs; woods, 

 fields, and roadsides; chiefly in the southern half of the state. 

 June-Sept. [A. gracilens var. frascri (Muell.-Arg. ) Weatherby] 

 A. gracilens A.Gray 



5. Tragia L. 

 T. cordata Michx. Banks of the Ohio R. at Golconda, Pope Co., 

 S. A. Forbes; E. J. Palmer. [7\ macrorarpa \Villd.]. 



6. Chamaesyce S.F.Gray 



{Euphorbia ex p.) 



1. Leaves entire; stems prostrate; whole plant glabrous. 



2. Leaves roundish-oval. 1-3 mm long; sandy soil, local. July-Sept. 

 .'. C. serpens (HBK.) Small 



