724 



Umbelliferae 



Sium 



50 



Map 1539 



Pe rider i d la amencana (NuttJ Reichenb. 



~~ 50 



Map 1540 



Sium suave Wal 



and swamp white oak flat about 4 miles northwest of Chrisney. This area 

 is a low, flat woods about a half mile wide on the east side of Little Pigeon 

 Creek. The soil is a hard, white, slightly acid clay in which are found 

 several plants distinctly southwestern in their distribution. 

 W. Ind. to Mo., southw. to Tenn. and Ark. 



6038. SIUM [Tourn.] L. 



1. Sium suave Walt. (Rhodora 17: 131. 1915.) (Sium cicutaefolium 

 Schrank.) Water Parsnip. Map 1540. In the shallow water of the bor- 

 ders of ponds and sloughs and in springy places along streams, swampy 

 woodland, and ditches. 



Newf. to B. C, southw. to Fla., La., and Calif. 



6048. AETHIJSA L. 



See excluded species no. 479, p. 1078. 



6070. LIGUSTICUM L. 



1. Ligusticum canadense (L.) Britt. Map 1541. Our only specimen 

 was found in a moist place near the crest of a high wooded slope along the 

 Ohio River about 3 miles east of Elizabeth in Harrison County, and near 

 the road leading up the bluff from Stuart's Landing. This species was 

 reported in Coulter's Catalogue for Wilson from Hamilton County. Since 

 this species much resembles Thaspium barbinode which, no doubt, is more 

 or less frequent in Hamilton County and which was not reported by 

 Wilson, and since the habitat of Ligusticum canadense does not occur in 

 Hamilton County, there is little doubt but Wilson made an error in determi- 

 nation. I have not been able to locate Wilson's specimens. I never received 

 answers to the letters I sent him. 



S. Pa. and s. Ind. to Mo., southw. to Ga. and Ala. 



