202 UMBELLIFER^E. (PARSLEY FAMILY.) 



ceolate to ovate leaflets (1 - 1$' broad), sharply mucronate-serrate. (Archan- 

 gelica atropurpurea, Hoffm.) River-banks, Lab. to Del., 111. and Minn. June. 



4. CONIOSELINUM, Fisch. HEMLOCK-PARSLEY. 



Calyx-teeth obsolete. Stylopodium slightly conical. Fruit oval, flattened 

 dorsally, glabrous, the dorsal ribs very prominent, the lateral ones extended 

 into broad wings ; oil-tubes 1 - 4 in the intervals, 4 - 8 on the commissure ; 

 seed slightly concave on the inner face. Tall slender glabrous perennial, 

 with finely 2 - 3-pinnately compound leaves, few-leaved involucre or none, in- 

 volucels of elongated linear-setaceous bractlets, and white flowers. (Com- 

 pounded of Conium and Selinum, from its resemblance to these genera.) 



1. C. Canadense, Torr. & Gray. Leaflets pinnatiiid ; wings nearly as 

 broad as the seed ; oil-tubes 2 - 3 in the intervals, sometimes 1 or 4. Swamps 

 and cold cliffs, from Maine to Minn., southward to N. C. (in the higher moun- 

 tains), Ind., 111., and Mo. Aug. -Oct. 



5. TIEDEMANNIA, DC. 



Calyx-teeth evident. Fruit ovate to obovate, flattened dorsally ; dorsal ribs 

 filiform, the lateral broadly winged, closely contiguous and strongly nerved 

 next to the body (giving the appearance of 5 dorsal ribs) ; oil-tubes solitary in 

 the intervals, 2-6 on the commissure; Stylopodium short, thick-conical. 

 Glabrous erect aquatic herbs, with leaves reduced to petioles or of few narrow 

 leaflets; involucre and involucels present, and flowers white. (Dedicated to 

 the anatomist Prof. Tiedemann, of Heidelberg.) 



1. T. teretifblia, DC. Stem hollow, 2-6 high ; leaves reduced to cylin- 

 drical hollow pointed nodose petioles ; oil-tubes filling the intervals. Ponds 

 and swamps, Del. to Fla., and west to La. Aug., Sept. 



2. T. rigida, Coult. & Rose. (COWBANE.) Stem 2-5 high; leaves 

 simply pinnate, with 3-9 linear to lanceolate entire or remotely toothed leaf- 

 lets; oil-tubes mostly small. (Archemora rigida, DC.) Swamps, N. Y. to 

 Minn., south to the Gulf. Aug. Poisonous ; roots tuberif erous. 



6. HERACLEUM, L. COW-PARSNIP. 



Calyx-teeth minute. Fruit broadly oval or obovate, like Pastinaca, but with 

 a thick conical Stylopodium, and the conspicuous obclavate oil-tubes extending 

 scarcely below the middle. Tall stout perennial, with large ternately com- 

 pound leaves, broad umbels, deciduous involucre, and many-leaved involucels, 

 white flowers, and obcordate petals, the outer ones commonly larger and 2-cleft. 

 (Dedicated to Hercules. ) 



1. H. lanatum, Michx. Woolly; stem grooved, 4-8 high; leaflets 

 broad, irregularly cut-toothed. Wet ground, Newf . to the Pacific, and south- 

 ward to N. C., Ky., and Kan. June. 



7. PASTINACA, L. PARSNIP. 



Calyx-teeth obsolete. Fruit oval, very much flattened dorsally ; dorsal ribs 

 filiform, the lateral extended into broad wings, which are strongly nerved to- 

 ward the outer margin ; oil-tubes small, solitary in the intervals, 2-4 on the 

 commissure ; Stylopodium depressed. Tall stout glabrous biennial, with pin- 



