APETALOUS EXOGENOUS PLANTS. 481 



paniculata, Ell.) — Var., angustifolia, Ell. Stems slen- 

 der; branches mostly 3, forking, elongated, spreading; 

 leaves varying from linear to obovate; involucres small, 

 scattered; appendages of the glands transversely oblong. 

 Dry rich soil ; the var. in sandy pine-barrens. July-Sep- 

 tember. Stem l°-2° high. 



E. MARGINATA, Pursh. Leaves oblong-lanceolate, sub- 

 cordate ; iimhel 3-rayed, once or twice dichotomous ; invo- 

 Z^^cre-l eaves oblong, cordate, colored and membranaceous 

 at the margin; inner segments of the floral involucre 

 roundish; capsules hoary-pubescent. A handsome species, 

 remarkable for the variegated leaves. 



E. HELioscoPA, L. (Sun Spurge.) Erect ; /oraHeaves 

 obovate, cauline, wedge-shaped, sharply serrate, smooth ; 

 tiinbel 5-rayed, then 3-rayed and forked; fruit smooth and 

 even ; seeds reticulated. — A large annual weed, remarkable 

 for its symmetry. Stem smooth, erect, 8-16' high; leaves 

 scattered, |'-li' long, f as broad at the rounded or retuse 

 apex, tapering to the base ; umbels subtended by a large 

 involucre 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. 



tt Glands of the involucre 5, without appendages. 

 X Annuals. 



E. COMMUTATA, Engelm. Smooth; sterns erect or 

 ascending, umbellately or alternately branched ; leaves 

 thin, obovate, entire, the lower ones petioled, those of the 

 branches round-kidney-shaped, sessile; involucres nearly 

 sessile, shorter than the floral leaves; glands crescent- 

 shaped or 2-horned; capsule smooth, round-angled; seeds 

 ovoid, pitted. Stem 6-12' high ; leaves -J'-l' long ; plant 

 pale green. 



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