628 Order 112.— EUPHORBIACE^E. 



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

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



19 E. dentata Mx. St. low, slender, hairy, brachiately branched ; lvs. opposite, 

 petiolate, ovate-laitceolate, obtuse, coarsely dentate, paler and hairy beneath ; invoL 

 eubsessile, 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 ; lvs. 1 to 2', mostly lanceolate, but varying to linear. InvoL 

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



20 E. hypericifdlia L. St. smooth, branching, nearly erect, branches divaricate 

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

 seeds rugous, black. — CD A slender and branching plant, found in dry and rich 

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

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

 blotches, ciliatc, G — 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; lvs. oblong, oblique, obtuse, serrulate towards the end; stipules cleft and 

 fringed; invol. subsessile, appendages erenulate, 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 bair-liko 

 processes. 



22 E. rnactilata L. Procumbent; branches spreading; lvs. serrate, oblong, 

 hairy; lis. in crowded, axillary clusters; seeds brownish, A-angkd, wrinkled. — 

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

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

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

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

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

 23 and 24 are too closely allied. 



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

 lvs. obliquely elliptical, obtuso at both ends, denticulate near tho apex, sparsely 

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

 invol. slit on the back, appendages subentiro ; sds. ovate, A-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. Pr. puberulent, acutely angled. Seed |" long. 



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

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

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

 entire; Jr. woolly ; sds. A-angled, transversely rugous. — River banks, S. "W. States 

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

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

 ramial scarce half as large. Seeds light brown. 



25 E. polygonifolia L. Knot-grass Spurge. Procumbent; lvs. entire, lance- 

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

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

 smooth, succulent, prostrate plant, with milky juice. Stem3 G — 10' long, dicho- 

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

 3 — 3" by l", 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 ; lvs. obliquely cordate at the 

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

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

 spicuous; fr. angular; seed obtuse-angled, smottb. — f J) In cultivated lands, Car. 

 to Fla. and La, Spreading in largo patches, with altemato 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; lvs. very 

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

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

 bbtuscfy angled. — Banks of tho Miss., St, Louis (Engelm.) to N. Orleans (Hale). 



