UMBELLIFERiE. 89 



1. HirDROCOTYI^lE:, Tourn. Water Pennywort. 



H. Ameriea'na, 1j. Stem spreading and creeping, 

 very slender. Leaves kidney-shaped, crenato, slightly 

 lobed. Umbels 3-5-flowered, inconspicuous, in the axils of 

 the leaves. — Shady wet places. 



2. SAJilC'IiIA. Tourn. Sanicle. Black Snakeroot. 

 S. Marilan'diea, L. Leaves 5-7-parted. Staminate 

 flowers very numerous, and on slender pedicels. Styles long, 

 recurved. — Rich woods. 



VaF. Canaden'sis, L. Leaves 3-5-parted. A few stam- 

 inate flowers among the perfect ones, and on very short 

 pedicels. Styles shorter than the prickles of the fruit. — Low 

 rich woods, not so common. 



3. DAircus, Tourn. Carrot. 

 D. Caro'ta, L. (Common Carrot.) Found wild occa- 

 sionally in old fields. In fruit the umbel becomes hollow 

 like a bird's nest. 



4. HERACLE'VJM L. Cow-Paesnip. 



H. lana'tum, Michx. Umbels large and flat. Petioles 

 of the leaves spreading and sheathing. Leaves very large ; 

 leaflets broadly heart-shaped, deeply lobed. Low wet 

 meadows. 



5. PASTISTA'CA Tourn, Parsnip. 



P. sati'va, L. (Common Parsnip.) Pound wild in old 

 fields and along roadsides. Leaflets shining above. 



6. PEDOEDASrilM, L. 



1. P. nudicaule. Nutt. Pubescent. Peduncles 3-8 inches 

 high. Flowers white, in early spring. — N.W. 



2. P. villo'sum, Nutt;, has yellow &ovr era. — N.W. 



7. ARCHEM'ORA, D.C. COWBANE. 



A. riglda, DO. Calyx 5-toothed. Involucre almost none ; 

 involucels of many small bractlets. — Sandy swamps, south- 

 western Ontario. 



