LI I'HUKBlACK.t:. (?SPLK«;K FAMILY.) i'i'.^ 



atutely angled; seeds ovate, acute at oue end (4" lung). — .^andv .s.»il, 111. i.i 

 Wise, Minn., and Kan. 



3. E. petaloidea, Kngelm. Hesemlding the last, but half-^rect and 

 spreading ; lt(ict:i luu</t r, udnotver, retusc or einan/iiuite ; peduncles longer thau 

 the petioles ; involucres larger, the broadly cmnpamilate aj)pcn(la</es mnch litnjtr 

 and conspicuous; pod obtusely angled; seeds nearly 1" long. — l*'roni l«»wa 

 and Mo., westward. 



4. E. Serpens, IIBK. Stems filiform, ]»rostrate, and often rooting ; Itaits 

 round-ocitlc, obtuse or cordate at biu-e (only ^- l^" long) ; stipules mtmhruua- 

 ceous, triauf/uldr ; jjcdundes much longer than the petioles, at length in lt)o.'*e 

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

 crenulate (ippenda;/es ; pods acutely angled ; seo(]s ol)tusely angled (i" long or 

 less). — Kich soil, 111. and Iowa to Kan., and souihwanl. Karely adv. eastward. 

 * * Seeds minute! 1/ rou;/hened or transverse! i/ urinkled or pitted ; leaves mure 



iir !ess serruiute, smooth or often hairy. 



5. E. serpyllifolia, Ters. (ilabrou.s, prostrate-spreading; /^arcs o6ora/e- 

 ohlon<i, narrowed at the very oblique base, sharj)ly serrulate toward the obtuse 

 apex (3-6" long, often with a red spot); stipules lanceolate, fiml)riate; |)e- 

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

 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. glyptosp^rma, Eugelm. Glabrous (or very rarely puberulent), 

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

 sliglitly 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 4-angled and with 5 or 6 sharp 

 tratisverse ivrinkles (^" long). — Ont. to Wise., 111., Mo., and westward. 



7. E. macul^ta, L. Prostrate; stems puberulent or hairy ; leaves oblong- 

 linear, very obli(iue at base, serrulate upward, more <jr less pubescent or some- 

 times smoothisli (4 -G" long), usually with a brown-red spcjt 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) ap])endages; pods acutely angled, j)uberulent ; 

 seeds ovate (|" long), sitarply 4-(inglcd and ivith about 4 shallow grooves across 

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



8. E. humistr^ta, Engelm. l*rocumbent. puberulent or hairy ; leaves 

 ellij)tical ur obovate, very oblicpie at base, serrulate toward the apex, sparsely 

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

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

 scarcely foliaceous lateral du.sters ; involucre clrf} on the had-, its (red or while) 

 a])])endagos truncate or crenate; pods sharply angled, puberulent ; seeds ovate, 

 obtusely angled, minutely roughened (i" long). — Kich soil, Ind. and W. Tenn. 

 to Minn, and K.in. 



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

 (1-2° higli) ; leaves oldique at the obtu.sc or slightly cordate ba.'Je, uvate-ob- 

 loug or oblong-linear, sometimes falcate, serrate (i-l^' long), often with a 



