AMMIACEAE. 209 



leaflets toothed or incised. Umbels irregular, compound, few-rayed. Bracts of 

 the involucres resembling the leaves. Sepals 5, persistent. Petals white, yel- 

 lowish, or purple. Fruit subglobose or oblong, somewhat dorsally flattened, 

 armed with hooked bristles : carpels ribless : oil-tubes usually 5. — Sum. — 

 Snake-root. Black snake-root. Sanicle. 



Plants perennial : stamens and style much exserted : fruits mostly over 6 mm. long. 



1. 8. niarylandica. 

 Plants biennial : stamens and style included : fruits mostly less 



than 6 mm. long. 2. 8. canadensis. 



1. S. marylandica L. Stems 4.5-13 dm. tall, mostly simple below the inflo- 

 rescence: leaves bluish-green: involucels of scale-like bractlets: petals slightly 

 longer than the sepals : fruits obovoid, not stipitate. — Common, in woods and 

 thickets. 



2. S. canadensis L. Stems 3-13 dm. tall: divisions of the leaf -blade cuneate- 

 obovate to narrowly oblong: involucre of minute bracts: fruits subgobose, 

 3-5 mm. long, very short-stipitate. ■ — Common, in woods and thickets. 



3. CHAEROPHYLLUM [Tourn.] L. Annual herbs. Leaf-blades ter- 

 nately decompound, the segments narrow. Umbels irregular, compound. Invo- 

 lucres of 1 or 2 bracts, or usually wanting. Involucels of several small bracts. 

 Sepals obsolete. Petals white, usually unequal, inflexed at the apex. Fruit 

 elongate: carpels 5-angled, the angles equally ribbed: oil-tubes solitary in the 

 intervals and 2 in the inner face. 



1. C. procumbens (L.) Crantz. Plants decumbent or spreading: umbels few- 

 flowered : fruits narrow, about 8 mm. long, glabrous. — Frequent, in rich woods 

 along the Conestoga and the Susquehanna. — Spr. — Chervil. 



4. CEREFOLIUM [Eivin.] Haller. Annual herbs, resembling Chaero- 

 phyllum. Leaf -blades ternately decompound, the segments small. Umbels com- 

 pound, regular or nearly so. Involucre of toothed or compound bracts. In- 

 volucels of narrow, mostly entire, bractlets. Sepals obsolete. Petals white, 

 usually nearly or quite equal, inflexed at the apex. Fruit elongate. Carpels 

 more or less angled, but not ribbed: oil-tubes wanting. [Anthriscus Bernh.] 



1. C. Cerefolium (L.) Britton. Plants 1 m. tall or less, often weak-stemmed: 

 leaf -blades broad, the segments rather numerous, thin: imabels long-peduncled, 

 the rays few, 2-4 mm. long: petals white, obovate, 1.5-2 mm. long: fruits 

 linear-subulate, 8-10 mm. long, shining slender-beaked. — M, Locally abun- 

 dant on moist banks. Nat. of Eu. — Spr. ■ — • Chervil. 



5. WASHINGTONIA Eaf. Perennial herbs. Leaf -blades ternately com- 

 pound, the segments broad. Umbels loose, compound. Involucres and invo- 

 lucels of few bracts or bractlets, or wanting. Sepals obsolete. Petals white, 

 inflexed at the apex. Fruits elongate : carpels 5-angled, with barely equal ribs : 

 oil-tubes obsolete or wanting. — Spr. — Sweet-cicely. 



Rachis of the leaf-blades glabrous or with short hairs : stylopodium and styles fully 

 3 mm. long. 1. W. longistylis. 



Rachis of the leaf -blades with villous hairs : stylopodium and 



styles about 1 mm. long. 2. TT. Claytonii. 



1. W. longistylis (Torr.) Britton. Boots sweet-aromatic: foliage finely pubes- 

 cent : fruits 15-18 mm. long. — Common, in rich woods. 



2. W. Claytonii (Michx.) Britton. Eoots slightly if at all aromatic: foliage 

 more copiously pubescent than in W. longistylis : fruits 18-20 mm. long. — 

 Common, in rich woods. 



Lancaster County Flora 14. 



