646 EUPHOKBIACEAE (^SPUKGE FAMILY^ 



acutely aiiijlerl ; seeds ovat<', acute at one encl, 1 mm. long. — Randy soil, 111. to 

 Wise, Minn., and Kan. June-Sept. 



-*-* ** Appendages of the involucral glands broad and conspicuous, white and 



petaloid. 



3. E. petaloidea Engelm. Half-erect and spreading ; leaves narroichj oblong, 

 retuse or ernaryinate ; peduncles 2 mm. in lengtli, longer than the petioles ; pod 

 obtusely angled; seeds nearly 2 mm. long. — la. and Mo., westw. and south- 

 westw. June-Sept. 



4. E. zygophylloides Boiss. Habit of the preceding but taller and more 

 slender; leaves linear; peduncles capillary, 5 ram. long ; capsule deeply 3-sul- 

 cate, the lobes carinate ; seeds obscurely 4-angled. {e. Nuttallii Small.) — 

 Limestone barrens, Greene Co., Mo. (Blankinship) to Kan., and southvvestw. 



-»- -*- Leaves suborbicular, 1-3 mm. long ; pod 1-1.5 mm. long. 



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

 roiind-ovate, obtuse or cordate at base, only 1-3 mm. 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 crenu- 

 late appendages; pods acutely angled; seeds obtusely angled, 1 mm. long or 

 less. — Kich soil, s. w. Ont., 111., and la. to Kan., and southw. ; rarely adv. eastw. 



** Seeds minutely roughened or transversely wrinkled; leaves more or less 



serrulate. 



•*- Glabrous or nearly so. 



•*-*■ Seeds acutely angled ; leaves 4-12 mm. long. 



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

 long, narrovs^ed at the very oblique base, sharply serrulate toward the obtuse apex, 

 6-12 mm. long, often with a red spot ; stipules lanceolate, fimbriate ; peduncles 

 as long as or longer than the petioles, at length in loose foliaceous lateral clus- 

 ters ; glands of the small involucre with narrow somewiiat toothed appendages ; 

 pods sharply angled ; seeds acutely quadrangular, slightly cross-v'rinkled, often 

 pitted, nearly 1.5 mm. long. — Sandy and alluvial soil, n. ^lich. (Farwell) to Mo., 

 Tex., and westw. 



7. 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, 4-10 mm. long ; stipules lanceolate, seta- 

 ceously divided ; peduncles as long as the petioles, in dense foliaceous lateral clus- 

 ters ; glands of the very small involucre with narrow crenulate appendages ; 

 pods sharply angled ; seeds sharply 4:-angled and icith 5 or 6 sharp transverse 

 wrinkles. 1 mm. long. — Oxford Co., Me. (Parlin, Miss Furbish) ; Fi.sher's I., 

 N. Y. ; Ont. to Wise, Mo., and westw. 



•»-*• 4-h Seeds obtusely angled; leaves 1-3 cm. long. 



8. E. Preslii Guss. Stem often subsimple below, erect or obliquely ascend- 

 ing, 2-10 dm. high ; leaves oblique at the obtuse or slightly cordate base, ovate- 

 oblong or oblong-linear, sometimes falcate, serrate, 1-3 cm. long, usually with a 

 red spot or red margins; stipules triangular ; peduncles longer than the petioles, 

 collected in loo.se leafy terminal cymes ; appendages entire, larger and wliite, or 

 smaller and sometimes red ; pod glabrous ; seeds ovate, obtusely angled, wrinkled 

 and tubercled, 1 mm. long, blackish. {E. liypericifolia Man. ed. '\ not L.? E. 

 nutans Lag.) — Dry open soil, Mass. to Ont., Wise, Neb., and southw. 



H- H- Puberulent to hirsute. 



9. E. hirsuta (Torr.) Wiegand. Of lower stature and more procumbent than 

 the piceedhig ; stems hirsute, copiously branched from near the base ; leaves 

 smaller, 8-14 mm. long, oblong to ovate ; seeds black with pale semi-transparent 

 envelope, sharply 4-angled, the flatti.sh or concave sides ob.scurely wrinkled, 

 (E. hypericifoUa, var. Tnrr.) — Dry sandy soil, e. Que. to w. Ont., s. to N. J., 

 Pa., O., and 111., common. 



