Jones: Flora of Illinois, 94. Euphorbiaceae 175 



2. 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, roadsides, and wooded slopes, local. July-Oct. \_A. 

 digyneia Raf.] A. virginica L. 



1. Leaves short-petioled (petiole V8"/4 ^^^ length of the blade), elliptic-lanceo- 

 late to lanceolate, or linear; bracts with 9-11 ovate to deltoid teeth; stem 

 with short, curved hairs; woods, fields, and roadsides, chiefly in the s. 

 third of the state. June-Sept. [/I. gracilens var. fraseri (Muell. Arg.) 

 Weatherbyj ...' A. gracilens Gray 



4. Phyllanthus L. 



P. caroliniensis Walt. Sandy soil; Peoria, Menard, Macoupin, St. Clair, 

 and Wabash counties. May-Oct. 



5. 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 



2. Leaves oblong, longer than broad, 4-20 mm. in length. 



3. Seeds 2-3 mm. long; sandy soil. Lake and Cook counties. July-Sept 



C. polygonifolia (L.) Small 



3. Seeds 1.5 mm. long; sandy soil. June-Sept.; known from Jo Daviess, 

 Lee, Henry, Henderson, Mason, and Cass counties. First collected 



at Beardstown, Cass Co., by C. A. Geyer in 1842 



C. geyeri (Engelm.) Small 



1 . Leaves toothed, at least at the apex. 



4. Capsules glabrous; seeds wrinkled. 



5. Capsules 2 mm. long; leaves obliquely oblong-Ianceolate, often red- 

 marked, the larger ones 1-3 cm. long; stems erect or ascending; fields 

 and roadsides, common throughout 111. July-Sept. \_E. preslit Guss.; 

 E. nutans Lag.; E. hypericijolia sensu Am. auth., non L.; C. lansingii 

 Millsp.} Nodding Spurge C. maculata (L.) Small 



5. Capsules 1.5 mm. long; leaves linear-oblong, the larger ones 4-10 mm. 



in length; stems spreading or prostrate; sandy or gravelly soil, not 

 common; known from Cook, Lee, Henry, Peoria, and St. Clair coun- 

 ties. June-Sept C. glyptospermn (Engelm.) Small 



4. Capsules pubescent; stems prostrate, villous. 



6. Leaves usually somewhat pubescent beneath; seeds 0.8-0.9 mm. long, 



minutely pitted and inconspicuously tranversely rugose; cult, ground 

 and roadsides, common. July-Oct. [£. maculata of auth., not L.} 



Milk Spurge C. supina (Raf.) Moldenke 



6. Leaves glabrous beneath; seeds 1 mm. long, papillose, obscurely wrin- 

 kled; sandy soil, local. July-Sept C. humistrata (Engelm.) Small 



6. Euphorbia L. — Spurge 

 1. Glands of the involucres with petal-like appendages. 



