This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Erect biennial or perennial glabrous herbs, with pinnately decompound leaves, the segments linear or capillary, and compound umbels of yellow flowers. Involucre and involucels none. Calyx-teeth obsolete. Petals obtuse or slightly refuse at the apex. Stylopodium large, conic. Fruit linear-oblong, glabrous, terete or nearly so. Carpels half-terete, dorsally flattened, prominently ribbed; oil-tubes solitary in the intervals. Seed-face flat, or slightly concave. [Latin, diminutive of foenum, hay, from its odor.]
About 4 species, natives of the Old World, the following typical.
Anethum Foeniculum L. Sp. Pl. 263.
1753. Foeniculum vulgare Hill, Brit. Herb.
413. 1756. Foeniculum Foeniculum Karst. Deutsch. Fl 837. 1880-83.
Perennial, branched, 2°-4° high. Leaves very finely dissected into capillary segments; petioles broad, clasping; umbels large, 9-25-rayed, the rays rather stout, somewhat glaucous, 1'-3' long in fruit; pedicels 1"-4" long, slender; fruit about 3" long.