628 OBDEB 112. EUPHORBIACE.E. 



ripper 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 divaricate 

 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, tlv> 

 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 Kngelm. Decumbent at base, much branched, slender, 

 glabrous Ivs. oblong, oblique, obtuse, serrulate towards the end; stip'ilos cleft and 

 fringed; invol. subsessile, appendages crenulato, 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; Hi in crowded, axillary clusters; seeds brownish, 4-angLd, wrinkled. 

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

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

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



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

 crowded near tho summit, involucro minute, white. Jl. Sept. This and Nos. 

 23 and 24 arc too closely allied. 



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

 Ivs. 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 subentiro ; sds. ovate, 4-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 f " long. 



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

 oval, very obtuse at both end?, minutely serrulate towards tho apex, villous be- 

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

 entirj; Jr. woolly; sds. Wangled, transversely rugous. River banks, S. AV. States 

 (Hale). Spreading in largo patches, with rather denso 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 large. Seeds light brown. 



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

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

 tary; seed)- large (I" long) smooth, ovoid. CD Sea shores, R. I. to Fin. A very 

 smooth, succulent, prostrate plant, vvilh milky juice. Stems C 10' long, dicho- 



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

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

 tho forks of the purplo stem. June, July. 



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

 base, oval, obtuso, entire, distinctly petiolato; 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 i:i largo patches, with alternate branches and open 

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



27 E. serpens II. 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; iavol. appendages scarcely any; sds. smooth, 

 obtusely angled. Banks cf tho Miss., St. Louis (Engelm.) to N. Orleans (Hale). 



