UMBELLIFEREAE. (Vou. Il. 
1. Heracleum lanatum Michx. 
Cow-Parsnip. (Fig. 2641.) 
Heracleum lanatum Michx. Fl. Bor. Am. 1: 
166. 1803. 
Very stout, tomentose-pubescent, 4°-8° 
high, the stem ridged, often 2’ thick at the © 
base. Leaves petioled, ternately divided, 
very pubescent beneath, the segments 
broadly ovate, or orbicular, cordate, stalked, 
lobed and sharply serrate, rather thin, 3/-6’ 
broad; petioles much inflated; umbels 6/— 
12’ broad, 8-30-rayed, the rays stout, 2’-4’ 
long; pedicels 3//-9/’ long in fruit; fruit 
broadly oval, or obovate, 4/’-6’’ long, 3//— 
434’’ broad, finely pubescent, emarginate at 
the summit. 
In moist ground, Labrador and Newfound- 
land to Alaska, south to North Carolina, Mis- 
souri, Utah and California. Called also 
Master-wort. June-July. 
7. PASTINACA I. Sp. Pl. 262. 1753. 
Tall erect mostly biennial branching herbs, with thick roots, pinnate leaves, and com- 
pound umbels of yellow flowers. Inyolucre and involucels commonly none. Calyx-teeth 
obsolete. Stylopodium depressed. Fruit oval, glabrous, much flattened dorsally; dorsal 
and intermediate ribs filiform, the lateral winged, those of the two carpels contiguous and 
forming a broad margin to the fruit; oil-tubes solitary in the intervals and 2-4 on the com- 
missural side. Seed very flat. [Latin pastus, food. ] 
About 7 species, natives of Europe and Asia. 
1. Pastinaca sativa. Wild Parsnip. Madnep. Tank. (Fig. 2642.) 
Pastinaca sativa J,. Sp. Pl. 262. 1753. 
Peucedanum sativum §. Wats. Bot. King’s 
Exp. 128. 1871. 
Biennial or rarely annual, glabrous, 
or somewhat downy-pubescent, 2°-5° 
high, the root long, conic, fleshy. 
Lower and basal leaves petioled, pin- 
nate, often 144° long, the segments 
rather thin, ovate or oval, obtuse, sessile, 
lobed or incised and sharply dentate, 
1/-3/ long; upper leaves generally much 
reduced; umbels several or numerous, 
2/-6’ broad, 7-15-rayed, the rays slen- 
der, %4’-2/ long; pedicels very slender, 
3/’-6” long in fruit; fruit broadly oval, 
234//-3%4’’ long, 2//-3’’ broad, the dor- 
sal and intermediate ribs not prominent 
but the oil-tubes conspicuous. 
Roadsides and waste places, a very com- 
mon weed in nearly all parts of our area. 
Naturalized from Europe. June-Sept. 
8. IMPERATORIA L,. Sp. Pl. 259. 1753. 
Tall perennial herbs, with large ternately divided or 2-pinnate leaves, sheathing petioles, 
and compound umbels of white flowers. Calyx-teeth obsolete. Petals ovate, mostly emar- 
ginate. Fruit much flattened dorsally, broadly oval, to nearly orbicular, the lateral ribs 
broadly winged all around, the intermediate and dorsal ribs slender, wingless; oil-tubes soli- 
tary in the intervals and 2 on the commissural side. Styles and stylopodium short. Seed- 
face flat. [Named for its supposed forceful medicinal properties. ] 
About 10 species, natives of the Old World. 
