PENTANDRIA TRIGYNIA. 341 



143. SIUM. Water-parsnip. 



S. laiifolium : stem angular ; submerged leaves bipinnatifid ; upper 

 ones pinnate ; leaflets oblong-lanceolate, unequal at the base, acute- 

 ly serrate ; umbels terminal. 



HAB. Shady swamps. July, 1j- ; root creeping ; stem 1-angled, 18 

 inches high ; leafl. 4 pairs ; flower -white. 



S. lineare : stem angular and sulcate ; leaves pinnate ; leaflets 4 5 

 pairs, linear-lanceolate, acutely and finely serrate ; involucra many- 

 leaved, linear, umbels terminal. 



HAB. Swamps. Aug. 7J.; stem 1-ang., 2 3 feet high; leaflets 

 long and narrow ; Jlower white ; calyx obsolete. 



144. CONIUM. Hemlock. 



C. maculatum : stem very smooth, spotted ; leaves tripinnate ; leaflets 

 lanceolate, pinnatifid ; segments lanceolate, nearly entire. 



HAB. Roads sides, &c. July, tf ; stem 2 4 feet high ; leaves smooth 

 and shining ; Jlower white. Poisonous. 



145. HERACLEUM. Cow-parsnip. 



H. lanatum : leaves ternate, petiolate, tomentose beneath ; leaflets pe- 

 tioled, round-cordate, lobed ; fruit orbicular. 



HAB. Wet meadows. June, 'ZJ. ; stem 3 5 feet high, thick pu- 

 bescent ; umbel large ; Jlower white. 



146. PASTINACA. Parsnip. 



P. saliva : stem sulcate ; leaves pinnate ; leaflets subpubescent beneath, 



oblong, incised ; terminal one 3-lobed. 

 HAB. Fields, &e. July Sept. tf ; stem 2 feet high, smooth ; leaflet 



sessile ; Jlower yellow. 



147. ANGELICA. 



A. triquinata : stem terete, pubescent above ; leaves ternate, very 

 smooth ; the partitions quinate ; leaflets oblong-ovate, equally serrate ; 

 the inferior ones 2-lobed at the base. 



HAB. Dry woods. Aug. 7J.; stem 3 5 feet high, straight, white 

 above, leaves thick ; Jlower white. 



A. atropurpurea : stem smooth, colored ; leaves ternate ; the partitions 

 subquinate ; leaflets ovate acute, incisely serrate, sublobed ; the three 

 terminal ones confluent ; petioles very large, inflated. 



HAB. Wet meadows. June, Tj. ; root aromatic; stem 3 5 fee.t 

 high, thick, purplish ; Jlower greenish. 



TRIGYNIA. 

 148. VIBURNUM. 



V. Lentago: smooth; leaves broad-ovate, acuminate, acutely serrate; 

 petioles margined, undulate ; cymes sessile. 



