Calyx-teeth conspicuous. Fruit obovate to oval, much flattened dorsally; dorsal ribs small or obscure in the depressed back, the lateral with broad thick corky closely contiguous wings forming the margin of the fruit; oil-tubes 12--18 about the seed and many scattered through the thick corky pericarp.--A perennial mostly glabrous herb, with 2-pinnate leaves (upper opposite and 3-cleft), the segments cuneate and incised, no involucre, narrow involucels, and bright yellow flowers in May. (Named from πολύς, _many_, and ταινία, _a fillet_, alluding to the numerous oil-tubes.) 1. P. Nuttàllii, DC. Plant 2--3° high; pedicels and involucels pubescent.--Barrens, Mich, to N. Ala., west to the Rocky Mts. 9. PEUCÉDANUM, L. Calyx-teeth mostly obsolete. Fruit roundish to oblong, much flattened dorsally; dorsal ribs filiform and approximate; the lateral extended into broad closely coherent wings; oil-tubes 1--4 in the intervals, 2--6 on the commissure.--Dry ground acaulescent (or short caulescent) herbs, with fusiform roots, dissected leaves, no involucre, yellow or white flowers, and stylopodium depressed or wanting. (The ancient Greek name.) 1. P. nudicaùle, Nutt. Pubescent, with peduncles 3--8´ high; _leaves bipinnate, the small oblong segments entire or toothed; involucels of scarious-margined (often purplish) lanceolate bractlets; flowers white or pinkish; fruit almost round_, emarginate at base, _glabrous_, with wings hardly as broad as the body, and _indistinct or obsolete dorsal ribs; oil-tubes solitary in the intervals_.--Minn. to Iowa and Kan., and westward. One of the earliest spring bloomers. 2. P. fœniculàceum, Nutt. Tomentose or glabrous, with peduncles 8--12´ long; _leaves finely dissected, with short filiform segments; involucels gamophyllous, 5--7-cleft, with conspicuously hairy margins; flowers yellow; fruit broadly oblong, glabrous_, with wings half as broad as the body, and _prominent dorsal ribs; oil-tubes 1--3 in the intervals_.--Minn. to Tex. March--April. 3. P. villòsum, Nutt. More or less pubescent throughout, 3--8´ high; _leaves finely dissected, with very numerous narrow crowded segments; involucels of ovate to linear bractlets; flowers yellow; fruit oval_, with wings half as broad as the body, and _prominent dorsal ribs; oil-tubes 3 or 4 in the intervals_.--Minn. to Neb. and Dak., southwestward to Ariz. Root much elongated. 10. CYMÓPTERUS, Raf. Calyx-teeth more or less prominent. Fruit usually globose, with all the ribs conspicuously winged; oil-tubes one to several in the intervals, 2--8 on the commissure. Stylopodium depressed. Seed-face slightly concave.--Mostly low (often cespitose) glabrous perennials, from a thick elongated root, more or less pinnately compound leaves, with or without an involucre, prominent involucels, and white flowers (in ours). (From κῦμα, _a wave_, and πτερόν, _a wing_, referring to the often undulate wings.)