628 OBDE* 112. EUPHORBIACE^E. 



upper stained deep red on the edges, &c., more or less. Invol. reddish, with a 

 sessile gland. Jn., Jl. (E. cyathiflora Jacq.) 



19 E. dentata MX. St. low, slender, hairy, brachiately branched; Ivs. opposite, 

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

 subsessile, in a terminal cluster, each with 5 ovate, laciniate lobes; fr. minutely 

 velvety; seeds globular, tubercled. In shady places, Penn. to Iowa and La. 

 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. hypericifblia L. St. smooth, branching, nearly erect, branches divaricato 

 spreading ; Ivs. oval-oblong, very oblique, serrate all around ; corymbs terminal ; 

 seeds rugous, black. CD A slender and branching 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 as wide, oblique, on very short petioles. Co- 

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



21 E. glyptosperma Engelm. Decumbent at base, much branched, slender, 

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

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

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

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

 processes. 



22 E. maculata L. Procumbent; branches spreading; Ivs. serrate, oblong, 

 hairy; fis. in crowded, axillary clusters; seeds brownish, 4-anglsd, wrinkled. 

 CD Plant spreading fiat upon the ground, in sandy fields, Can. and U. S. Stem 

 C 12' in length, much branched, hairy. Leaves opposite, 3 G'/ long and ^ as 

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

 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. humistrata Engelm. Procumbent, roughly and minutely villous, diffuse ; 

 Iv3. obliquely elliptical, obtuse at both ends, denticulate near the apex, sparsely 

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

 invol. slit on the back, appendages subentire ; sds. ovate, ^-angled, minutely rough- 

 ened (not wrinkled), ash-colored. Banks of tho Mississippi, St. Louis (Engelman) 

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

 times spotted above. Fr. puberulent, acutely angled. Seed j?" long. 



24 E. prostrata Ait. Prostrate, very diffuse, villous-pulverulent ; Ivs. roundish- 

 oval, 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. woolly; sds. 4-angled, transversely rugous. Eiver 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, tho cauline 3 to 5" by 2 to 3", the 

 ramial scarce half as large. Seeds light brown. 



25 E. polygonifolia L. KNOT-GRASS SPURGE. Procumbent; Ivs. entire, lance- 

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

 tary ; seeds large (L" long) smooth, ovoid. CD Sea shores, R. I. to Fla. A very 

 smooth, succulent, prostrate plant, with milky juice. S*tems 6 10' long, dicho- 

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

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

 the forks of the purple stem. June, July. 



26 E. cordifolia Ell. Prostrate, spreading, glabrous ; Ivs. obliquely cordate at the 

 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. (3) In cultivated lands, Car. 

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

 foliage. Lvs. 3 to 5'', rarely G", slightly variegated. Sds. brownish white. 



27 E. serpens H. B. K. (Engelman). Prostrate, spreading, glabrous ; Ivs. very 

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

 tioles, solitary or several in the axil ; invol. appendages scarcely any ; sds. smooth, 

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



