Calyx-teeth prominent. Fruit oblong to nearly orbicular, glabrous, with strong flattish corky ribs (the lateral largest); oil-tubes conspicuous, solitary; stylopodium depressed; seed nearly terete.--Smooth marsh perennials, very poisonous, with pinnately compound leaves and serrate leaflets, involucre usually none, involucels of several slender bractlets, and white flowers. (The ancient Latin name of the Hemlock.) 1. C. maculàta, L. (SPOTTED COWBANE. MUSQUASH ROOT. BEAVER-POISON.) Stem _stout_, 2--6° high, streaked with purple; leaves 2--3-pinnate, the lower on long petioles; _leaflets lanceolate_ to oblong-lanceolate (1--5´ long), acuminate, coarsely serrate, the veins passing to the notches; pedicels in the umbellets numerous, very unequal; fruit broadly ovate to oval, 1--1½´´ long.--Throughout the U. S. Aug. 2. C. bulbífera, L. _Rather slender_, 1--3° high; leaves 2--3-pinnate (sometimes appearing ternate); _leaflets linear_, sparsely toothed (1--2´ long); _upper axils bearing clustered bulblets_; fruit (rare) scarcely 1´´ long.--Common in swamps, N. Scotia to Del., west to Minn. and Iowa. 27. ÆGOPÒDIUM, L. GOUTWEED. Calyx-teeth obsolete. Fruit ovate, glabrous, with equal filiform ribs, and no oil-tubes; stylopodium conical and prominent; seed nearly terete.--A coarse glabrous perennial, with creeping rootstock, biternate leaves, sharply toothed ovate leaflets, and rather large naked umbels of white flowers. (Name from αἴξ, _goat_, and πόδιον, _a little foot_, probably from the shape of the leaflets.) Æ. PODAGRÀRIA, L., a common and troublesome weed in Europe, is reported from R. I. to Del. and E. Penn. 28. LEPTOCAÙLIS, Nutt. Calyx-teeth obsolete. Fruit very small, ovate, usually bristly or tuberculate, with somewhat prominent ribs; oil-tubes solitary in the intervals; stylopodium conical; seed-face plane or somewhat concave.--Very slender smooth branching annuals, with finely dissected leaves (segments filiform or linear), and small white flowers in very unequally few-rayed pedunculate umbels. (Name from λεπτός, _slender_, and καυλός, _a stem_.) 1. L. divaricàtus, DC. Plant 1--2° high, with branches and umbels diffusely spreading, the very slender rays ½--1´ long and the longer pedicels often 3--6´´ long; fruit tuberculate, ½´´ long. (Apium divaricatum, _Benth. & Hook._)--N. C. to Fla., west to Ark. and Tex.; reported from Kan. April. 2. L. pàtens, Nutt. Of similar habit, but the umbels shorter and more strict, the rays 3--6´´ long or less and the pedicels short; fruit densely sharp-tuberculate or nearly smooth. (Apiastrum patens, _Coult. & Rose._)--Central Neb. to Tex. and N. Mex. 29. DISCOPLEÙRA, DC. MOCK BISHOP-WEED.