Erect perennial glabrous branching herbs, with pinnately decompound leaves, and compound umbels of white flowers. Involucre none, or of a few short bracts. Involucels of several narrowly linear bracts. Calyx-teeth obsolete. Petals with an infolded tip. Stylopodium depressed-conic. Fruit oval or oblong, dorsally flattened. Carpels with prominent approximate dorsal and intermediate ribs, the lateral ones broadly winged and conspicuous. Oil-tubes mostly 2-3 in the intervals, and 4-8 on the commissural side. Seed-face slightly concave, its back strongly convex. [Greek, hemlock-parsley.]

About 10 species of the north temperate zone. Besides the following, some 3 others occur in western North America. Type species: Conioselinum tataricum Hoffm.

1. Conioselinum Chinénse (L.) B.S.P. Hemlock-Parsley

Fig. 3126

Athamanta chinensis L. Sp. Pl. 245. 1753.

Selinum canadense Michx. Fl. Bor. Am. 1: 165. 1803.

C, ( ?) canadense T. & G. Fl. N. A. 1: 619. 1840.

Conioselinum chinense B.S.P. Prel. Cat. N. Y. 22. 1888.

Stem terete, striate, 2°-5° high. Lower leaves long-petioled, the upper nearly sessile, all decompound into linear-oblong acutish segments; petioles sheathing; umbels terminal and axillary, 2 - 3' broad, 9-16-rayed; rays rather slender, 1 1/2-2 1/2 long; pedicels very slender, 2"-3" long; fruit prominently ribbed, broadly oval, about 2" long.

In cold swamps, Newfoundland to southern New York, south in the mountains to North Carolina, west to Ontario, Indiana and Minnesota. Ascends to 5000 ft. in North Carolina. Aug.-Sept.

Conioselinum púmilum Rose, of Labrador, is a smaller plant, with umbel-rays only 6"-9" long.

1 Conioselinum Chin Nse L B S P Hemlock Parsley 1468