EUPHORBU. CXXI. EUPHORBIACE^E. 487 



ciliate, subsessile, oval and entire; ped. terminal, solitary, 1- flowered. 7{. In 

 rocky shades, Penn. Pursk. Jl. Aug. 



7. E. LATHYRIS. Mole-tree. Caper Spurge. 



St. erect, stout, smooth ; Ivs. lance-linear, rather acute, entire, glabrous, 

 sessile ; umbel mostly 4-rayed, rays dichotomous ; glands of the invol. lurate, 2- 

 horned, the horns dilated and obtuse. Cultivated grounds and gardens. 

 Stem 2 3f high. Leaves 24' by 3 9", numerous and arranged in 4 rows on the 

 stem. Umbel of 4 verticillate branches with a central subsessile head. Jl. Sept. 



8. E. HERRONII. Riddell. Herron's Euphorbia. 



Erect, pilose, with opposite branches ; lower Ivs. rhombic-ovate, middle 

 ones lanceolate, upper lance-linear, denticulate, obtuse at apex, acute at base ; 

 umbels small, few flowered. Ohio. Plant hairy in all its parts, 1 2f high. 

 Petiole ciliate, half as long as the leaves. Aug. Sept. 



9. E. ANGUSTIFOLJA. Haworth 1 St. much branched at base, ascending and 

 with barren branches above ; Ivs. crowded, linear, obtuse ; umbel many-rayed, 

 proliferous ; floral invol. 2-leaved, leaflets broad-cordate. % A heath-like plant 

 of the gardens, native of , If high. Leaves 1' by 1", very numerous, spi- 

 rally arranged, apparently verticillate. j- 



10. E. MARGINATA. PuTsh. Lvs. oblong-lanceolate, subcordate, sessile, acute, 

 mucronate, entire on the margin, glabrous ; umbel 3-rayed, once or twice dicho- 

 tomous; involucrate Ivs. oblong, cordate, colored and membranaceous at the 

 margin ; inner segments of the floral involucre roundish ; caps, hoary-pubes- 

 cent. Gardens. A handsome species, remarkable for the variegated leaves 

 of the involucre, f 



* * Heads axillary or fasciculate. Leaves opposite. 



11. E. HYPERICIPOLIA. Spurge. Eye-bright. 



St. smooth, branching, nearly erect, branches divaricate-spreading; Ivs. 

 opposite, oval-oblong, serrate, sub-falcate; corymbs terminal. A .slender and 

 branching plant, found in dry and rich soils. Stem 1020' high, usually pur- 

 pie, very smooth, the branches often pubescent, U. S. and Can. Leaves tripli- 

 veined, marked with oblong dots and blotches, ciliate, 6 12" long, and i as 

 wide, oblique, on very short petioles. Corymbs of small white heads, terminal 

 and axillary. July, Aug. 



12. E. MACULATA. (E. depressa. Ett. E. thymifolia. Linn.} Spoiled Spurge. 

 Procumbent; branches spreading; Ivs. serrate, oblong, hairy ; fls. axillary. 



A prostrate plant, spreading flat upon the ground, in sandy fields, Mass. ! 

 to Ind. ! and S. States. Stem 6 12' in length, much branched, hairy. Leaves 

 opposite, 3 6" long and \ 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. 



13. E. POLYGONIFOLIA. Knot-grass Spurge. 



Procumbent ; Ivs. entire, lanceolate and oblong, obtuse at base ; fls. in the 

 axils of the branches, solitary. Sea shores, R. I. ! to Flor. A very smooth, 

 succulent, prostrate plant, with milky juice. Stems 6 10' long, dichotomous, 

 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. 



J4. E. IPECACUANHA. Ipecac Spurge. 



Procumbent or suberect, small, smooth ; Ivs. opposite, obova-te and oblan- 

 ceolate ; ped. elongated, axillary, 1-flowered. % Sandy soil, Middle ! and S. 

 States. Root perennial, very long. Stem rather thick and succulent, 3 8' 

 long. Leaves 1 2' by 3 6", sessile, varying from obovate to linear. Heads 

 solitary. Peduncles as long as the leaves. June. 



15. E. DENTATA. Michx. Toothed-leaf Spurge. 



Hairy; Ivs. opposite, oval, dentate; fls. crowded at the summit of the 

 stem. Shady rocks, Penn., Torrey, to Tenn., Mickaucc. Upper leaves 

 spottprl. Probably a variety of E. hypericifolia. Jl. Aug. 



