ORDER 112. EUPHORBIACE^E. 627 



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

 then cymously branched; Ivs. aU similar, opposite, narrowly linear, lather acute ; 

 invol. broadly obconic, 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 iuvol. con- 

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



12 E. gracilis E1L Tery smooth and slender, st. 2 or 3-forked below, the 

 branches then repeatedly forked ; Ivs. all similar, oblong and oblong-liaear, ob- 

 tuse, entire, subpetiolate, mostly opposite ; invol. on long peduncles, dark purple 

 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. 



j3. ROTUNDIFOLIA. Lvs. roundish or quite orbicular, entire, edged with purple. 

 With the other, 6' high. A singular variety. 



13 E. helioscopia L. SUN SPURGE. Erect; floral Ivs. obovate, cauline wedge- 

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

 smooth and even ; sds. reticulated. OP 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, 3 !-' long, f as broad at the 

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

 volucre of 5 obovate leaves. Each of the 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 pedicellate fascicles. June, July. Eur. 



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

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

 M owe or twice trichotomous, then simply forlxd; glands entire, subsessile ; fruit 

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

 La. (E. tetrapora Engelm., found in "W". La. (Hale), diners 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. muricate, with wart-like points; styles 2-cleft; sds. compressed, smooth and 

 even. Waste grounds, Can. to Ya. and "W. States. A smooth, erect plant, If 

 high. Lvs. 1' or more long, the floral much shorter. Invol. subsessile, 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, thefi-jral ovate ; umbel 5 to 8-rayed, 

 rays once or twice divided; segm. of the invol. colored, entire, subrenifojm ; fr. 

 slightly warty ; sds. smooth. 11 Moist woods, Penn. to N". Car. (Curtis). St. 2 

 to 3 high, smooth, rarely branched below the umbel. Lvs. 3 to 4/ 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 DarL, nee Kit.) 



17 E. IpecacuanhaB L. IPECAC SPURGE. Procumbent or suberect, smooth, 

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

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

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

 nial, very long. St. rather thick and succulent, 3 to 8' long. Lvs. H to 2' by 3 

 to 6". varying from obovato to linear. Hds. solitary. Ped. as long as tho 

 leaves. Jn. 



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

 tall ; Ivs. ovate, or sinuate-toothed, or panduriform, the highest often lance-linear, 

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

 5 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, tho 



