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..
Perennial herbs, with 1-2-ternate leaves, and compound umbels of white flowers. Bracts of the involucre and involucels none, or rarely few and early deciduous. Calyx-teeth obsolete. Petals inflexed at the apex. Stylopodium thick, conic. Fruit ovate-oblong, glabrous, somewhat compressed. Carpels obscurely 5-angled, the ribs slender, equal, distant; oil-tubes none. Seed-face flat. [Greek, goat-foot.]
One or perhaps two species, natives of temperate Europe and Asia, the following typical.
A. Podagraria L. Sp. Pl. 265. 1753.
Erect, branched, glabrous, 1 1/2°-2 1/2° high. Basal and lower leaves long-petioled, biternate, the primary divisions stalked, the segments ovate, acute, or acuminate at the apex, rounded, or cordate and often oblique at the base, sharply serrulate, 1 1/2'-3' long; upper leaves similar but smaller and usually simply ternate; umbels long-peduncled, 1 1/2'-2 1/2' broad, 9-25-rayed; rays 1' long in fruit or more; pedicels 2"-4" long; fruit about 2" long, scarcely 1" wide, the styles deflected.
In waste places, Massachusetts to New Jersey, Pennsylvania and Delaware. Ad-ventive from Europe. Wild or English masterwort, Ax-ashe- or aise-weed. Dwarf or Bishop's-elder. Bishop's-weed. White-ash-herb. Garden-plague. Dog-elder. June-Aug.
44. E┘LOPHUS Nutt.; DC. Mon. Omb. 69. pl. 2. 1829.
Perennial slender glabrous branching herbs, from deep tuberous roots, with ternately or pinnately compound leaves, and long-peduncled compound umbels of white or pink flowers. Involucre generally of 1 bract, sometimes none. Involucels of several narrow bracts. Calyx-teeth usually prominent. Petals obovate, the tip inflexed. Stylopodium conic. Styles recurved. Fruit glabrous, linear to oblong in our species; ribs filiform, with 1-5 oil-tubes in the intervals. Seed-face concave. [Greek, well-plumed; application not apparent]
About 8 species, natives of North America, extending into Mexico. Besides the following typical one, 5 others occur in the western United States.
Eulophus americanus Nutt.; DC. Mem. Omb. 69. pl. 2. 1829.
Erect, 3°-5° high. Basal and lower leaves large, long-petioled, ternately compound into linear acute or obtusish segments; upper leaves similar, smaller and shorter-petioled; petioles sheathing at the base; umbels terminal, 3'-4' broad, the rays 6-12, very slender, 2'-4' long; involucre of 1-2 bracts, or none; involucels of several narrowly lanceolate acuminate bracts; pedicels almost filiform, 4"-8" long in fruit; flowers whitish; fruit oblong, 2."-3" long.
In dry soil, Ohio and Illinois to Kansas, Tennessee and Arkansas. July.