AMMIACEAE. 211 



1. Z. aurea (L.) Koch. Blades of the basal leaves ternate; segments oblong- 

 ovate to lanceolate: umbels with 9-25 rays: fruits oblong, about 4 mm. long. 



— Common, in wet places. — Golden-alexanders. 



2, Z. cordata (Walt.) DC. Blades of the basal leaves ovate to orbicular, 3-10 

 cm. long, crenate: fruits ovate or oval, about 3 mm. long. — Common, in moist 

 places. 



11. CICUTA L. Perennial herbs with tuberous roots. Leaf-blades pin- 

 nately compound or decompound. Umbels compound. Involucres of few 

 bracts or wanting. Involucels of several small bractlets. Sepals acute. Petals 

 white. Fruit short : carpels with 5 corky ribs, and oil-tubes in each interval 

 and 2 in the linear face. Sum. and fall. — Water-hemlock. 



Plants not bulblet-bearing : leaf-segments of a lanceolate type. 1. C. maciilata. 



Plants bulblet-bearing : leaf-segments of a linear type. 2. C. iulbifera. 



I.e. maculata L. Plants stout, 1-2 m. tall: leaf -blades 1-6 dm. long, the 

 veins ending in the notches of the segments: fruits with lateral ribs mani- 

 festly much larger than the others and wedge-shaped in section, and contiguous. 



— Common, in swamps. — Spotted-cowbane. Musquash-root. 



2. C. bulbifera L. Plants slender, mostly 1 mm. tall or less: leaf -segments 

 linear to narrowly linear-lanceolate, sharply few-toothed: umbels few-rayed 

 (or replaced by clusters of bulblets) : petals white, orbicular-obovate, less than 

 1 mm. long: fruits globose-ovoid, about 1.5 mm. long. — Occasional, in the 

 Susquehanna valley and along tributary streams. 



12. DEE/INGA Adans. Perennial herbs with fibrous roots. Leaf-blades 

 3-foliolate. Umbels irregular, compound. Involucres and involucels wanting. 

 Sepals obsolete. Petals white. Fruit elongate: carpels with 5 low ribs, and 

 an oil-tube beneath each rib and in each interval. 



1. D. canadensis (L.) Kuntze. Plants 3-10 dm. tall: leaf -blades ovate, oval, 

 or elliptic, 4-10 cm. long, serrate : umbels few-rayed : fruits oblong, 4-6 mm. 

 long, often curved. — Common, in thickets and waste places. — Spr. and sum. 



— Il0NE"\V0RT. 



13. TAENIDIA Drude. Perennial herbs with fibrous roots. Leaf -blades 

 pinnate or ternately compound. Umbels compound. Involucres and involucels 

 wanting: sepals obsolete or minute. Petals 5, their tipsi inflexed. Fruit ob- 

 long: carpels 5-angled, with slender ribs and 3 oil-tubes in the intervals. 

 Seeds nearly terete except the flat face. 



1. T. integerrima (L.) Drude. Plants 3-& dm. tall, from a tough root: leaflets 

 ovate to oblong or oblong-lanceolate, 1-3 cm. long, entire: umbel-rays 10-20, 

 elongate: corolla yellow: fruits broadly oblong, 3.5-4 mm. long. — M. Fre- 

 quent, along the Conestoga above Lancaster. — Limestones. — Spr. — PiM- 

 pernell. 



14. AEGOPODIUM L. Perennial caulescent herbs. Leaf-blades ternate, 

 the leaflets or segments large, toothed. Umbel compound, the rays equal or 

 nearly so. Involucres and involucels of narrow bracts and bractlets, or want- 

 ing. Sepals minute or obsolete. Petals white, equal or nearly so, broadest 

 above the middle, inflexed at the apex. Fruit short, but longer than thick: 

 carpels turgid, the angles margined : oil-tubes wanting. 



1. A. Podagrarla L. Plants 3-11 dm. tall, simple or sparingly branched: 

 leaflets oblong or elliptic to ovate, 2. .5-9 cm. long, serrate, incised or lobed: 



