Order 112.— EUPHORBIACEiE. 627 



11 E. Curtisii Engelm. Smooth, very slender, branched from the base; division 

 then cymously branched; lvs. all similar, opposite, narrowly linear, lather acute; 

 invol. broadly obconie, the glands (inner segments) narrowly bordered with a 

 white membrane. — A very slender species, allied to E. corollata, about 10' high. 

 Lvs. 5 to 10" long, less than 1" wide. The narrow white border of invol. con- 

 spicuous. Ga. (Feay, Pond,) to N. Car. (Curtis.) 



12 E. gracilis Ell. Very smooth and slender, st. 2 or 3 -forked below, tho 

 branches then repeatedly forked ; lvs. all similar, oblong and oblong-linear, ob- 

 tuse, entire, subpetiolate, most'y opposite; invol. on long peduncles, dark purplo 

 with oval glands; fr. strongly 3-lobed, smooth, seeds smoothish, dull. — Sandy 

 pine barrens, S. Car. to Fla. Plant 5 to 10' high, wholly purple when young. 

 Lvs. 8 to 12" long, very variable in width. Mar., Apr. 



/?. rotuxdifoLIA. Lvs. roundish or quite orbicular, entire, edged with purple. 

 — With the other, C high. A singular variety. 



13 E. helioscopia L. Sun Spurge. Erect ; floral lvs. obovate, cauline wedge- 

 form, sharply serrate, smooth; umbeV 5-rayed, then 3-rayed and forked; fruit 

 smooth and even; sds. reticulated. — © A milky weed in cultivated grounds, N. H. 

 to Niagara, S. to Car., remarkable for the symmetry of its vegetation. Stem 

 smooth, erect, 8 — 16' high. Leaves scattered, § — 1^' long, f as broad at the 

 rounded or retuse apex, tapering to the base. Umbels subtended by a large in- 

 volucre of 5 obovato leaves. Each of tho 5 rays is pilous with scattered hairs 

 and subdivided into an umbellet of 3 rays with a 3-leaved involucel, and these 

 finally into 2 or more pedicellato fascicles. Juno, July. § Eur. 



14 E. Arkansana Engelm. & Gr. Slender ; floral lvs. roundish-ovate, subcor- 

 date, obtuse, cauline oblong-spatulate or obovate, all serrulate and glabrous ; vm- 

 bel once or twice trichctomous, then simply forked; glands entire, subsessilo ; fruit 

 Warty, seeds reticulated. — Lexington, Ky. (Short, in Gray's Manual) to Ark. and 

 La. (E. tetrapora Engelm., found in W. La. (Hale), differs from this in having 

 2-horned glands of the involucre and seeds nearly smooth and even. The foliage 

 is almost indentical (fide spec, labeled by Dr. Engelmann). ) 



15 E. obtusata Ph. "Warted Spurge. Lvs. all sessile, obtuse, finely serrulate, 

 tapering to the base, sparsely hairy beneath, the cauline oblanceolate, floral round- 

 ish cordate, clasping, mucronate ; umbel 3 to 5-rayed, rays 2 or 3 times forked ; 

 fr. murieate, with wart-like points; styles 2-cleft; sds. compressed, smooth and 

 even. — Waste grounds, Can. to Va. and W. States. A smooth, erect plant, If 

 high. Lvs. 1' or more long, the floral much shorter. Invol. subsessilo, with small, 

 hairy lobes, and large, oval glands. Sds. brown when ripe. — Closely resembles 

 E. platyphylla L. 



16 E. Darlingtonii Gray. Lvs. entire, oblong-lanceolate and oblanceolate, acute, 

 narrowed to the base, subsessile, pilous beneath, the floral ovate ; umbel 5 to 8-rayed, 

 rays once or twice divided; segm. of the invol. colored, entire, subretii'brm; fr. 

 slightly warty; sds. smooth. — If Moist woods, Penn. to N. Car. (Curtis). St. 2 

 to 3f high, smooth, rarely branched below the umbel. Lvs. 3 to -1' by 1', entire 

 or slightly serrulate above, those of the stem alternate, of the branches opposite, 

 and nearly as broad as long. Floral invol. purplish brown within. Caps, at 

 length nearly smooth. May, Jn. (E. memoralis Dark, nee Kit.) 



17 E. Ipecacuanha L. Ipecac Spurge. Procumbent or suberecr, smooth, 

 with numerous, diffuse, forking stems; lvs. opposite, obovate and oblanceolate, 

 entire, obtuse, subsessilo ; ped. elongated, axillary, 1-flowered ; seeds white, dot- 

 ted, flattened. — % Sandy soil, near the coast, Conn. (Robbins) to Ga. Rt. peren- 

 nial, very long. St. rather thick and succulent, 3 to 8' long. Lva 1^- to 2' by 3 

 to 6", varying from obovato to linear. Hds. solitary. Ped. a3 long as the 

 leaves. Jn. . % 



18 E. heterophylla Mx. (Engelm.) St. thick, green, glabrous, much branched, 

 tall ; Ics. ovale, or sinuate-toothed, or panduriform, tho highest often Jaucc-linear, 

 all on slender petioles and scattered; invol. all clustered and terminal, each with 

 6 ovate lobes ; fr. large, smooth, seeds ovoid, tubercled. — W. 111. to Iowa (Cou- 

 sens), S. to Ga. (Pond). Plant of singular aspect, 1 to 3f high. Lvs. 18" to 2' 

 long, on stalks half as long, usually narrowed in the middle to a fiddle-shape, the 



