628 Oedeb 112.— BUPHORBIAOBiB. 



upper stained deep red on the edges, &0;, more or less. Intel, reddish, witB a 

 sessile gland. Jn., Jl. (E. oyathiflora Jaoq.) 



19 E. dentita Mx. St. low, slender, hairy, braohiately branched; Ivs. opposite, 

 petiolate, ovate-lanceolate, obtuse, coarsely dentate, paler and hairy beneath ; invol. 

 aubsessile, in a terminal cluster, each with 5 ovate, laoiuiate lobes; fr. minutely 

 velvety; seeds globular, tubereled. — ^lu shady places, Penn. to Iowa and ta. 

 Plant 6 to 12' high ; Ivs. 1 to 2', mostly lanceolate, but varying to linear, invol. 

 with one or more stalked glands. Seeds grayish. Jn. — Aug. 



20 E. hypericifolia L. iSif. smooth, branching, nearly erect, branches divaricate 

 spreading; Ivs. oval-oblong, very oblique, serrate all a/round; corymbs terminal ; 

 seeds rugous, black. — (J) A slender and brandling plant, found in dry and rich 

 soils, U. S. and Can. Stem 10 — 20' high, usually purple, very smooth, the 

 branches often pubescent. Leaves tripli-veined, marked with oblong dots and 

 blotches, ciliate, 6 — 12" long, and J as wide, oblique, on very short petioles. Co- 

 rymbs of small, white heads, terminal and axillary. July, Aug. 



21 E. glyptosp^rma Engelra. Semmbent at base, much branched, slender, 

 glabrous; Ivs. oblong, oblique, obtuse, serrulate towards the end; stipyles cleft and 

 fringed ; invol. subsessile, appendages crenulate, white ; sds. angular, sculptured, 

 amber color. — Madison, Wis. (Laphara), and southwestward. A delicate species. 

 Lvs. C" by 2", and smaller, strongly arcuate. Stipules whitish, cleft into hair-like 

 processes. 



22 B. maoulata L. Procumbent; branches spreading; lvs. serrate, oblong, 

 hairy; lis. in crowded, axillary clusters; seeds brownUh, i-angled, wrinkled. — 

 (D Plant spreading flat upon the ground, in sandy fields, Can. and U. S. Stem 

 6 — 12' in length, much branched, hairy. Leaves opposite, 3 — 6" long and J as 

 wide, oblong, obtuse, serrulate, smooth above, often spotted with dark purple, the 

 margin ciliate, pale and hairy beneath, on short stalks. Heads of flowers small, 

 crowded near the summit, involucre' minute, white. Jl. — Sept. This and Nos. 

 23 and 24 are too closely allied. 



23 E. humistr^ta Engelm. Procumbent, roughly and minutely villous, diffuse; 

 lvs. obliquely elliptical, obtuse at both ends, denticulate near the apex, sparsely 

 hairy beneath; ped. crowded in lateral clusters, shorter than the very short pelMes; 

 invol. slit on the back, appends^es subentiro; sds. ovate, 4rangled,iniM,tely rottgli- 

 etied (not wrinkled), ash-colored. — Bankg of the Mississippi, St. Louis (Engelman) 

 and southwestward. Lvs. 4 to 7" by 2 to 4", sometftnes nearly smooth, some- 

 times spotted above. Pr. puberulent, acutely angled. Seed |" long. 



24 E. prostrata Ait. Prostrate, very diffuse, villous-pulverulent ; lvs. roundisb- 

 ovalj very obtuse at both ends, minutely serrulate towards the apex, villous be- 

 neath ; ped. clustered, longer than the very short petioles ; invol. appendages obtuse, 

 entire ; fr. wooUy ; sds. 4i-angled, transversely rugous. — River banks, S. W. States 

 (Hale). Spreading in large patches, with rather dense foliage, clothed all over 

 with a fine dusty wool Lvs. of two sizes, the caulino 3 to 5" by 2 to 3", the 

 ramial scarce half as largo. Seeds light brown. 



25 E. polygonifolia L. Knot-qbass Spurge. Procumbent; lvs. entirti, lance- 

 olate and oblong, obtuse at base ; invol. .subsessile, in the axils of the branches, Soli- 

 tary; seeds large (I" long) i3mooth, ovoid. — CD Sea shores, R. I. to Pla. A very 

 smooth, suooulent, prostrate plant, with milky juice. Stems 6 — 10' long, dicho- 

 tomous, procumbent. Leaves oblong and linear-lanceolate, rarely cordate at base, 

 3 — 5" hy 1", petioles about 1". Stipules subulate and simple. Heads small, in 

 the forks of tlio purple stem. June, July. 



26 E. cordifolia Ell. Prostrate, spreading, glabrous ; lvs. obliquely cordate at tlie 

 base, oval, obtuse, entire, distinctly petiolate ; stipules laciniate ; ped. nearly as long 

 as the leaves, loosely clustered, subterminal ; invol. appendages oval, white, con- 

 spicuous; fr. angular; seed obtuse-angled, smooth. — (Din cultivated lands, Car. 

 to Fla. and La. Spreading in large patches, with alternate branches and open 

 foliage. Lvs. 3 to 5'', rarely 6", sliglitly variegated. Sds. brownish white. 



27 E. s^rpena H. B. K. (Engelman). Prostrate,, spreading, glabrous ; los. very 

 small, roundish-oval, obtuse at both ends, entire; ped. much longer than the ps- 

 iioles, solitary or several in the axil ; invol appendages scarcely any ; sds. smootli, 

 obtusely angled; — Banks of the Miss., St. Louis (Engelm.) to N. Orleans (Hale). 



