868 AMMIACEAE 
sessile. Involucres wanting. Involucels of a few bracts. Sepals prominent. Petals 
yellow. Disk flat. Fruit somewhat elongated, laterally flattened : carpels with 5 slender 
wingless ribs and an oil-tube in each interval and under each rib. Seeds angled. The 
plants flower in spring and summer. 
Basal leaves with merely toothed cordate blades. 1. Z. cordata. 
Basal leaves with 2-3-ternately compound blades. 
Foliage light green: rays of the umbel stiff, ascending : fruit 4 mm. long. 2. Z. aurea. 
Foliage dark green : raysof the umbel filiform, irregularly spreading : fruit less than 3 
mm. long. 7 3. Z. Bebbii. 
1. Zizia cordata ( Walt.) DC. Stems 4-10 dm. tall, mostly branched, pale green : 
leaf-blades various, those of the basal leaves ovate or suborbicular, 3-10 cm. long, crenate, 
deeply cordate, those of the stem-leaves mostly 3-foliolate or sometimes 5-foliolate ; seg- 
ments crenate or serrate-crenate : umbels 2-6 cm. broad: rays 7-16, ascending, 1-5 cm. 
long : corolla yellow, about 2 mm. broad : fruit ovate or oval, 3 mm. long, 10-ribbed. 
In woods and copses, Connecticut to the Northwest Territory, Georgia, Missouri and Oregon, 
2. Zizia aürea (L.) Koch. Stems 3-8 dm. tall, simple or branched above : leaf- 
blades once to thrice ternately compound, those of the basal and lower stem-leaves long-pe- 
tioled, those, of the upper stem-leaves once ternate, on short winged petioles ; segments 
oblong-ovate to lanceolate, 2-8 cm. long, sharply serrate : umbel 3-6 cm. broad : rays 9-25, 
stiff, ascending, unequal, 2-5 cm. long: corolla yellow, 3-3.5 mm. broad: fruit oblong, 
about 4 mm. long. 
In meadows and swamps, New Brunswick to Ontario, Montana, Florida and Texas. 
3. Zizia Bébbii (Coult. & Rose) Britton. Stems often tufted, 1-6 dm. tall, simple 
or branching, dark green: leaf-blades once to thrice ternately compound, the lower ones 
long-petioled, the upper with winged'petioles: leaflets thickish, oval, oblong, elliptic or 
lanceolate, 1-4 cm. long, serrate : umbels slender-peduncled, straggling : rays 2-12, filiform, 
unequal, 2-8 mm. long, unequally spreading: fruit suborbicular or broader than high, 
2-2.5 mm. long. |Z. aurea var. Bebbii Coult. & Rose.] 
1n woods on mountain slopes, Virginia and West Virginia to Georgia. 
20. CICUTA L. 
Perennial herbs, with tuberous roots. Leaves alternate: blades pinnately compound, 
or decompound : leaflets toothed. Flowers in compound umbels. Involucres of few bracts 
or wanting. Involucels of several small bracts. Sepals acute. Petals white, broad, the 
tips inflexed. Fruit slightly -laterally flattened : carpels with 5 corky ribs and an oil-tube in 
each interval, and 2 in the inner face. Seeds nearly terete. WATER HEMLOCK. 
Fruit oval or ovoid, 4 mm. long, not constricted at the commissure. 1. C. maculata. 
Fruit orbicular, 2 mm. long, constricted at the commissure. 2. C. Curtiss. 
1. Cicuta maculata L. Tubers clustered, elongated. Stems 1-2 m. tall, glaucous 
marked with purple ridges, at length branched dengue: leaf-blades ample, triangular 
in outline, 1-6 dm. long, twice or thrice compound, the lower ones long-petioled, the 
upper with short dilated involute petioles: leaf-segments lanceolate or elliptic-lanceolate, 
2-14 cm. long, acuminate, coarsely serrate, their nerves impressed above, very prominent 
beneath, ending in the notches: bracts subtending the compound umbels linear-subulate, 
deciduous : rays numerous, very unequal : sepals triangular: petals white, about 1 mm. * 
diameter, broader than long, apiculate and rolled in at the apex, short-clawed : fruit = 
or oval, 4 mm. long, not constricted at the commissure, the lateral ribs much the largest, 
wedge-shaped in section and contiguous : oil-tubes large. 
S swamps and meadows, New Brunswick to Manitoba, Virginia and Texas. Summer. MUSQUASR 
2. Cicuta Curtíssii Coult. & Rose. Resembling C. maculata, but with a stouter "n 
stock, thicker and more reticulated leaf-segments : fruit orbicular, 2mm. long, wey n 
at the commissure, the ribs apparently nearly equal, but the lateral ones largest, neit 
wedge-shaped nor contiguous. ; 
In swamps and low grounds, Virginia to Florida and Louisiana. Summer and fall. 
21. DERÍNGA Adans. ; 
Perennial caulescent herbs. Leaves alternate: blades 3-foliolate : leaflets toothed, te 
cised orlobed. Flowers perfect, in irregular compound umbels. Involucres and invo'u 
cels wanting. Hypanthium truncate. Petals white. Disk with a conic cyl 
Fruit elongated, latterally flattened : carpels slightly 5-angled with low ribs, and an oil-tu 
beneath each rib and in each interval. Seeds nearly terete. HoNEWORT. 
