326 EUPHORBIACE^. (SPUKGE FAMILY.) 



four in number; the more numerous stamens (often 25) with much smaller 

 anthers ; and by the smaller, more angular and more pointed, grayish 

 seeds. Brandegee, Fl. S. W. Colorado, 243. S. W. Colorado to the Rio 

 Grande. 



* * Seeds minutely roughened or transversely wrinkled, or pitted. 

 ->- Leaves entire. 



3. E. lata, Engelm. Canescent with appressed pubescence : stems from a 

 woody rootstock, spreading, short, rigid; lower internodes longer than the 

 leaves, uppermost very short : leaves triang alar-ovate, abruptly attenuate at 

 base, or oblong with revolute margins ; stipules triangular-lanceolate : involucre 

 axillary, solitary, campanulate, hairy, lobes elongated ; glands ovate with a very 

 narrow lobulate appendage : capsule hirsute : seed oblong, transversely wrinkled. 

 S. E. Colorado and southward. 



4. E. Fendleri, Torr. & Gray. Glabrous, from a slender rootstock: 

 stems delicately filiform, erect or decumbent : leaves ovate from a rounded 

 base ; stipules subulate, often laciniate at base : involucres terminal, solitary, 

 turbinate, slightly bearded in the throat, lobes short; glands transversely 

 oblong with a very narrow obsolete appendage : seed ovate, 4-angled, irregu- 

 larly punctate. S. Colorado and southward. 



5. E. revoluta, Engelm. Glabrous: stem erect, filiform, naked below, 

 much branched above the middle : leaves narrowly linear, revolute on the 

 margins, attenuated below ; stipules subulate, entire : involucres very small, 

 uppermost in the forks of the branches and terminal, short-campanulate ; glands 

 purple, with a whitish or reddish oblong appendage : capsule glabrous : seed 

 oblong, sharply 4-angled, sparingly and irregularly rugose. Colorado and 

 southward. 



s- -i- Leaves serrate or serrulate : /lowers in lateral leafy clusters. 



6. E. Stictospora, Engelm. Prostrate and pubescent: leaves rounded, 

 subcordate, sharply serrate: racemes crowded, with very small and slender 

 long-peduncled involucres : capsule sharp angled, pubescent : seeds slender, 

 sharply 4-angled, rugose-dotted. Bot. Mex. Bound. 187. Abundant in New 

 Mexico and extending into S. Colorado. 



7. E. serpyllifolia, Pers. Prostrate-spreading and glabrous : leaves 

 obovate-oblong, narrowed at the very oblique base, sharply serrulate toward the 

 apex: glands of the involucre with narrow somewhat toothed appendages: 

 seeds acutely 4-angled, slightly cross-wrinkled and often pitted. From Cali- 

 fornia and the Columbia River to the Saskatchewan, Iowa, and Texas. 



8. E. glyptosperma, Eugelm. Erect-spreading and glabrous : leaves 

 linear-oblong, mostli/ falcate, very unequal at base (semicordate), sharply serru- 

 late : glands of the very small involucre with narrow crenulate appendages : 

 seeds sharply 4-angled and with 5 or 6 sharp transverse wrinkles. From Illinois 

 and Wisconsin to Colorado and the Columbia River. 



9. E. maculata, L. Prostrate and puberulent or hairy: leaves oblong- 

 linear, very oblique at base, serrulate upwards, usually with a brown-red spot in 

 the centre: glands of the small involucre minute, with narrow slightly crenate 

 (usually red) appendages: seeds ovate, sharply 4-angled and with about 4 shal- 

 low grooves across the concave sides. Colorado, and common eastward. 



