AMMIACEAE 875 
a conie stylopodium. Fruit longer than broad, dorsally flattened: carpels with the dorsal 
and contiguous ribs thin, and winged lateral ribs, the latter nerved near the inner part of 
the wing: oil tubes solitary in the intervals and 2-6 in the inner face. Seeds much flat- 
tened dorsally. [ Tiedemannia DC. ] 
Leaves reduced to hollow, terete, transversely-jointed petioles (phyllodes). 1. O. filiformis. 
Leaves with simple, pinnate or palmate blades. 
Leaf-blades simple, or of 3 palmately disposed leaflets at the end of an elongated 
petiole. 2. O. ternata. 
Leaf-blades pinnately divided. 
Leaflets conspicuously elongated, less than 3 mm. wide: fruit 4 mm. long. 3. O. longifolia. 
Leaflets not conspicuously elongated, over 3 mm. wide: fruit 5-6 mm. wide. 4. O. rigidior. 
1. Oxypolis filifórmis ( Walt.) Britton. Stems 5-18 dm. tall, simple or branched 
above : leaf-blades reduced to elongated hollow jointed phyllodes, 0.3-6 dm. long, attenuate : 
bracts of the involucres linear-subulate : umbels 3-10 cm. broad : rays slender, 6-16, 2-7 
em. long: corolla white, about 2 mm. broad : pedicels 4-8 mm. long : fruit oblong-oval or 
oval-obovate, 5-6 mm. long, broadly winged ; oil-tubes one in each interval, and 2-4 in 
the commissural side. — [ Tiedemannia teretifolia DC.] 
In swamps, Virginia to Florida and Louisiana. Summer and fall. 
2. Oxypolis ternàta (Nutt.) Heller. Stems 5-9 dm. tall, usually somewhat 
branched : leaf-blades entire or divided into 3 elongated linear or filiform entire leaflets: 
umbels 3-10 em. broad: rays very slender, 2-6 cm. long, ascending or curved upward : 
cose white, 2-2.5 mm. broad: fruit oblong, 4-5 mm. long, winged, rather delicately 
ri i 
In low pine lands, North Carolina to Florida. Fall. 
3. Oxopolis longifólia (Pursh) Small. Similar to O. rigidior in habit. Leaves 
with conspicuously elongated entire leaflets less than 3 mm. wide : umbels few-rayed : fruit 
4 mm. long. [Sium longifolium Pursh.] 
In low grounds and swamps, New Jersey to South Carolina and Tennessee. Summer and fall. 
4. Oxypolis rigídior (L.) Raf. Stems 5-18 dm. tall, nearly simple or widely 
branched: leaf-blades pinnately divided; leaflets 3-9, thinnish, linear to oblong or 
lanceolate, acute or acuminate, 3-12 cm. long, entire or sharply toothed or incised : umbels 
5-15 em. broad : rays 7-25, 2-10 cm. long: corolla white, 3-3.5 mm. broad : fruit oblong 
or oval, 5-7 mm. long, winged ; oil-tubes 1 on each interval, 4-6 on the commissural side. 
In swamps or on wet banks, New York to Minnesota, Florida and Louisiana. Summer and fall. 
Cow-BANE. WATER DROPWORT. 
40. LOMATIUM Raf. 
Perennial herbs, with tuberous or thick roots, often acaulescent. Leaves basal: blades 
pinnate, ternate, or more or less finely dissected. Flowers in compound umbels. In- 
volucres wanting. Involucels of several or many bractlets. Hypanthium truncate, or nearly 
so. Petals white or variously colored. Disk with a depressed stylopodium, or flat. Fruit of 
various shapes, dorsally flattened : carpels with slender dorsal and contiguous ribs and 
lateral wings : oil-tubes usually 1-4 in the intervals and 2-10 in the inner side. 
1. Lomatium daucifdlium ( Nutt.) Coult. & Rose. Foliage tomentose, less densely 80 
in age. Stems very short: leaves clustered at base ; blades 5-15 cm. long, finely dissected, 
the ultimate segments narrowly linear or filiform : peduncles usually overtopping the leaves, 
1-2 dm. tall: umbels irregular, 2-10 cm. broad : rays 3-20, stoutish, 2.5-8 cm. long, those 
of the same umbel very variable in length : fruit broadly oblong, 5-8 mm. long, the wings 
3 = wide as the body, glabrous ; oil-tubes 1-3 in each interval, and 2-4 on the commissural 
side. 
On prairies, Missouri to Nebraska and Texas. Spring. 
41. PASTINACA L. 
Annual or biennial herbs, with thick conic roots and heavy scented. Leaves alternate : 
blades pinnately compound ; leaflets toothed or lobed. Flowers perfect, in compound 
umbels. Involucresand involucels usually wanting. Hypanthium truncate. Petals yellow. 
Disk with a depressed stylopodium. Fruit somewhat longer than broad, much dorsally 
flattened: carpels with the dorsal and contiguous ribs slender, and thin lateral wings: oil- 
tubes solitary in the intervals and 2-4 in the inner side. Seeds flat. WILD PARSNIP. 
1. Pastinaca sativa L. Biennial, glabrous below. Root narrowly conic, strong- 
scented : stems 6-20 dm. tall, simple or widely branched, sharply ridged: leaf-blades 
