Vor. II.] CARROT FAMILY. 
1. Imperatoria Ostrithium I. Mas- 
terwort. Felon-grass. Pellitory of 
Spain. (Fig. 2643.) 
Imperatoria Ostruthium I,. Sp. Pl. 259. 1753- 
Glabrous, or sparingly pubescent; stem stout, 
hollow, erect, 2°-5° tall. Leaves ternately di- 
vided into very broad stalked segments which 
are often 3-parted nearly or quite to the base, 
sharply and unequally serrate and often incised, 
the segments of the long-petioled lower leaves 
often 5’ broad; rays of the umbels and pedicels 
very numerous, slender; involucre none, or of 1 
or 2 lanceolate bracts; involucel-bracts few, nar- 
row, deciduous; fruit broadly oval, about 2’ long. 
aN 
) i} 
In fields, Pocono plateau of Pennsylvania and 
Michigan. Reported from Newfoundland. Natu- 
ralized or adventive from Europe. Called also | ,e 
Broad-leaved Hog’s Fennel. May-July. D 1 le 
a. a4" \ dp 
9. POLYTAENIA DC. Mem. Omb. 53. pl. 73. 1829. 
Perennial, nearly glabrous herbs, with pinnately decompound leaves, and compound 
umbels of yellow flowers. Involucre none, or rarely of 1-2 linear bracts. Involucels of a 
few subulate deciduous bracts. Calyx-teeth prominent, triangular. Petals obovate-cuneate, 
with a longincurved tip. Stylopodium none. Fruit oval or obovate, much flattened dor- 
sally, thick and corky; dorsal and intermediate ribs obscure, the lateral ones with thick 
wings which form a broad margin to the fruit, and are nerved toward the outer margin; oil- 
tubes 12-18, contiguous, with numerous smaller ones irregularly disposed in the thick peri- 
carp. Seed flat. [Greck, many-fillets, or oil-tubes. ] 
A monotypic genus of central North America. 
f Z 1. Polytaenia Nuttallii DC. Polytaenia. 
: (Fig. 2644.) 
Polytaenia Nuttallit DC. Mem. Omb. 53. f/. 17. 1820. 
Stem slightly scabrous, leafy, 1°-3° high; roots 
fusiform. Leaves petioled, or the uppermost 
smaller and sessile, pinnate, the segments deeply 
pinnatifid or parted, 1/-3/ long, the lobes ovate, ob- 
long or obovate, dentate or entire; umbels 6-12- 
rayed, 1/-214’ broad; rays scabrous, %4/—214/ long; 
pedicels finely pubescent, 1//-2/’ long; fruit gla- 
brous, 3/’-5’’ long, 24%4’/-314’’ broad, %”’ thick, 
the margins obtuse, the central part of both car- 
pels depressed when dry. 
Dry soil, Michigan and Wisconsin to Tennessee, 
Texas and Louisiana. April-May. 
10. PEUCEDANUM I, Spy eles) 1753" 
Perennial herbs, acaulescent or nearly so, from thick fusiform or tuberous roots, with 
ternate, pinnate, or in our species bipinnate or finely dissected leaves, and compound umbels 
of white or yellow flowers. Involucre none. Involucels of several or numerous bracts. 
Calyx-teeth mostly obsolete. Stylopodium depressed or none. Fruit oval, oblong or or- 
bicular, glabrous or pubescent, dorsally compressed. Carpels with filiform dorsal and inter- 
mediate ribs, the lateral ones broadly winged; oil-tubes 1-4 (rarely more) in the intervals, 
2-10 on the commissural side. Seed-face flat or slightly concave. [Name Greek. ] 
About 125 species, of wide geographic distribution. In addition to the following, about 47 
others occur in western North America. 
Flowers white or pinkish. 1. P. nudicaule. 
Flowers yellow. 
Fruit glabrous; involucel-bracts united. 
Plant pubescent. 2. P. foeniculaceum. 
Plant glabrous. 3. P. Kingit. 
Fruit finely pubescent; involucel-bracts linear, distinct. 4. P. villosum, 
