

EUPHORBIACE^E. (SPURGE FAMILY.) 453 



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

 Wise., Minn., and Kan. 



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

 spreading ; leaces lunger, narrower, retuse or emarginate ; peduncles longer than 

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

 and conspicuous; pod obtusely angled; seeds nearly 1" long. From Iowa 

 and Mo., westward. 



4. E. serpens, HBK. Stems filiform, prostrate, and often rooting ; leaves 

 round-ovate, obtuse or cordate at base (only i-1^-" 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 (-J" long or 

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



* * Seeds minute!// roughened or transversely u-rtii/cled 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 " long). Wise, to Mo., and westward. 



6. E. glyptosperma, 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 sharplv angled ; seeds sharply 4-angled and with 5 or & sharp 

 transverse u-rinkles (" long). Ont. to Wise., 111., Mo., and westward. 



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

 Unear, 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 ^-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. Preslii, 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 (J-lj' long), often with a 



