EUPHORBIACEJE. (SPURGE FAMILY.) 453 



acutely angled; seeds ovate, acute at one end ($" long). Sandy soil, 111. to 

 Wise., Minn., and Kan. 



3. E. petaloidea, Engelm. Resembling the last, but half -erect and 

 spreading ; leaves longer, narrower, retuse or emarginate ; peduncles longer than 

 the petioles ; involucres larger, the broadly campanulate appendages much larger 

 and conspicuous; pod obtusely angled; seeds nearly \" long. From Iowa 

 and Mo., westward. 



4. E. S^rpens, HBK. Stems filiform, prostrate, and often rooting ; leaves 

 round-ovate, obtuse or cordate at base (only -!" long); stipules membrana- 

 ceous, triangular; peduncles much longer than the petioles, at length in loose 

 foliaceous lateral clusters; glands of the very small involucre with minute 

 crenulate appendages ; pods acutely angled; seeds obtusely angled (" long or 

 less). Rich soil, 111. and Iowa to Kan., and southward. Rarely adv. eastward. 

 # # Seeds minutely roughened or transversely wrinkled or pitted ; leaves more 



or less serrulate, smooth or often hairy. 



5. E. serpyllifolia, Pers. Glabrous, prostrate-spreading; leaves obovate- 

 oblong, narrowed at the very oblique base, sharply serrulate toward the obtuse 

 apex (3 -6" long, often with a red spot); stipules lanceolate, fimbriate; pe- 

 duncles as long as or longer than the petioles, at length in loose foliaceous 

 lateral clusters ; glands of the small involucre with narrow somewhat toothed 

 appendages ; pods sharply angled ; seeds acutely quadrangular, slightly cross- 

 wrinkled, often pitted (nearly f" long). Wise, to Mo., and westward. 



6. E. glyptosp&rma, Engelm. Glabrous (or very rarely puberulent), 

 erect-spreading; leaves linear-oblong, mostly falcate, very unequal at base, 

 slightly serrulate toward the obtuse apex (2 - 5" long) ; stipules lanceolate, 

 setaceously divided ; peduncles as long as the petioles, in dense foliaceous lat- 

 eral clusters ; glands of the very small involucre with narrow crenulate ap- 

 pendages ; pods sharply angled ; seeds sharply ^-angled and with 5 or 6 sharp 

 transverse wrinkles ($" long). Ont. to Wise., 111., Mo., and westward. 



7. E. maculata, L. Prostrate; stems puberulent or hairy; leaves oblong- 

 linear, very oblique at base, serrulate upward, more or less pubescent or some- 

 times smoothish (4 -6" long), usually with a brown-red spot in the centre; 

 stipules lanceolate, fimbriate ; peduncles as long as the petioles, in dense foli- 

 aceous lateral clusters ; glands of the small involucre minute, with narrow 

 slightly crenate (usually red) appendages ; pods acutely angled, puberulent >, 

 seeds ovate (f long), sharply 4-angled and with about 4 shallow grooves across 

 the concave sides. Open places, roadsides, etc., common. 



8. E. humistrata, Engelm. Procumbent, puberulent or hairy ; leaves 

 elliptical or obovate, very oblique at base, serrulate toward the apex, sparsely 

 hairy underneath (4-9" long, sometimes with a brown spot above) ; stipules 

 lanceolate, fimbriate; peduncles rather shorter than the petioles, in dense 

 scarcely foliaceous lateral clusters ; involucre cleft on the back, its (red or white) 

 appendages truncate or crenate ; pods sharply angled, puberulent ; seeds ovate, 

 obtusely angled, minutely roughened (%" long). Rich soil, Ind. and W. Tenn. 

 to Minn, and Kan. 



9. E. Pr6slii, Guss. Smooth or with scattered hairs, ascending or erect 

 (1-2 high) ; leaves oblique at the obtuse or slightly cordate base, ovate-ob- 

 long or oblong-linear, sometimes falcate, serrate (i~li' l n g)> often with a 



