[++][++] Seeds rugose or reticulated; leaves serrulate; annuals.
18. E. dictyospérma, Fischer & Meyer. Stem erect (8–18´ high); leaves oblong- or obovate-spatulate, smooth, all obtuse and obtusely serrate; upper ones cordate at base; floral ones roundish-ovate or obscurely heart-shaped, slightly mucronate; umbels once or twice 3-forked, then 2-forked; involucre with nearly naked lobes and small almost sessile glands; styles shorter than the ovary, spreading or recurved; pod warty; seeds delicately reticulated.—Prairies and roadsides, Md. to Minn., Ala., and westward. May–July.
E. Helioscòpia, L. Stems ascending (6–12´ high), stout; leaves all obovate and very rounded or retuse at the end, finely serrate, smooth or a little hairy, those of the stem wedge-shaped; umbel divided into 5 rays, then into 3, or at length simply forked; glands orbicular, stalked; pods smooth and even; seeds with coarse honeycomb-like reticulations.—Waste places, eastward and along the Great Lakes to Mich. July–Sept. (Nat. from Eu.)
[+][+] Leaves entire; glands crescent-shaped or 2-horned.
[++] Seeds smooth and dark-colored; perennials, with running rootstocks.
E. Ésula, L. Stems clustered (1° high); leaves lanceolate or linear, the floral (yellowish) broadly heart-shaped, mucronate; umbel divided into many rays, then forking; glands short-horned (brown); pods smoothish and granular.—Mass., western N. Y., and Mich.; rare. (Adv. from Eu.)
E. Cyparíssias, L. Stems densely clustered (6–10´ high); stem-leaves linear, crowded, the floral heart-shaped; umbel many-rayed; glands crescent-shaped; pods granular.—Escaped from gardens, common. (Nat. from Eu.)
E. Nicæénsis, All. Stout and tall glabrous perennial; leaves oblong or oblong-lanceolate, the floral broadly heart-shaped, mucronate; terminal umbel many-rayed, the rays forking; glands short-horned; pods finely wrinkled.—A rare escape; Binghampton, N. Y. (Adv. from Eu.)
[++][++] Seeds sculptured, ash-colored; pod smooth; annuals or biennials.
E. Péplus, L. Erect or ascending (5–10´ high); leaves petioled, thin round-obovate, the upper floral ones ovate; umbel 3-rayed, then forking; glands long-horned; lobes of the pod 2-wing-crested on the back; seeds 2-grooved on the inner face, pitted on the back (scarcely over ½´´ long).—Waste places, N. Eng. to N. J. and western N. Y. (Adv. from En.)