EUPHORBIACE^. (SPURGE FAMILY.) 327 



I 2. Ijiaves opposite, on short petioles, equal at base, with stijmlar glands : stems 

 dichatomousl y branched, erect : cymes terminal, involucres icith 5 (jlands : seeds 

 tuherculafe. 



10. E. hexagona, Nutt. Somewhat hairy: Ktem a ((.ot or more high; 

 branches striate-anglcd : leaves liiiear-laiic-colate, entire: invdlucre hairy with- 

 out and within : glands with a green ovate-trianguhir aj»i)enda«,'o twice their 

 length: capsule smooth: seeds ovate. — From Texas and Colorado to the 

 Upper Missouri. 



§ 3. Uppermost or floral leaves with conspicuous while jtctnl-llkp vuinjius, uhorled 

 or opposite, the others scattered, equal at base, entire and sessile: iwohtrret 

 5-lobed, collected in an umhcl-like inflorescence. 



11. E. marginata, Pursh. Stem stout (2 to .3 feet higli), on-ct, hairy : 

 leaves ovate or oblong : umbel with 3 dichotomous rays : glands of llie 

 involucre with broad white appendages. — From Colorado to Kansas and 

 Nebraska. Cultivated and run wild in the Eastern States. 



B* Glands of the involucre without petaloid appendages. 

 § 4. Involucres in terminal clusters, 4 to 5-lobed, with few cup-shaj)ed glands : 

 seed without a caruncle: leaves dentate, all but the lowest opftosite, and 

 stipules glandular. 



12. E. dentata, Michx. Erect or ascending, hairy : leaves ovate, lameo- 

 late, or linear, petioled, coarsely toothed, upi)er ones often paler at the ha.se : 

 involucres almost sessile, with 5 oblong dentate lobes, and one or mure short- 

 stalked glands : seeds ovate-globular, slightly tubercled. — S. Colorado {Bran- 

 degee) and eastward to Illinois and Pennsylvania. 



§ 5. Involucres in a terminal dichotomous or commonlij umbelliferous inflnresrenre, 

 4 or 5-lobed, with as man// flat or convex entire or crescent-shaped glands : seeds 

 mostlij caruncidate : glabrous, with entire or serrulate scattered {except the 

 uppermost) leaves and no stipules. 



13. E. Obtusata, Pursh. Erect: leaves ohlong-^pntulato, minutfly serru- 

 late, smooth, obtuse ; upper ones cordate at base; floral ones ovate, dilated: 

 umbel once or twice divided into 3 rays, then into 2 : involucre with naked 

 lobes and small stipitate glands : styles distinct and longer than the ovary, erect, 

 2-cleft to the middle: pod beset with long ivarts: seeds smooth and evtn.— 

 S. Colorado, and from Illinois to Virginia. 



14. E. dictyosperma, Fisch. & Meyer. Erect : leaves oblong- or ovateJ 

 spatulate, smooth, obtuse and obtusely serrate; upper ouea cordate at base: 

 uml)els once or twice 3 forked, then 2-forked : involucre with nearly naked 

 lobes and small almost sessile glands : styles shorter than the ovary, spreading or 

 recurved: pod ivarty: seeds delicately reticulated. — Vrom California and Ore- 

 gon to Texas, Kentucky, and Nebraska. 



15. E. montana, Engelm. Very glabrou.** and glaucous: stomn leafy 

 and ascending : leaves rather thick; entire, ovate, obtuse ; flonil ones orbiculaie 

 triangular: umbels repeatedly dichotomous : involucre ronghish within, with 

 oblong-linear re/re^^ /o6e.s, and truncate, very shortly 2 horned elands: si>fle* 

 very short, bifid: pod smooth: seeds superflcially pitted. — Vr^^m the Upper 

 Platte to New Mexico, Arizona, and southward. 



