230 Karl M. Wiegand and Arthur J. Eames 



2. E. repandum L. Treacle Mustard. 



Lawns and waste places ; rare. July-Aug. 



Collected on the Eames lawn, Highland Road, Ithaca, 1923 ; new seeding, Babcock 

 farm, Inlet Valley, 1925 (W. C. Muenscher) ; Whetzel yard, Forest Home, 1924 (M. 

 F. Barms). 



Occasional in waste places about the eastern seaports, and in the Mississippi 

 Valley. Adventive from Eu. 



14. Roripa Scop. 18 



a. Pods linear, elongated, 10-25 mm. long. . 1. R. sylvestris 



a. Pods oblong-linear to globose, 5 mm. long or less. 



b. Pods short-cylindrical ; plant nearly glabrous. 2. R. palustris 



b. Pods subglobose; plant hirsute. 2a. R. p., var. hispida 



1. R. sylvestris (L.) Bess. (Radicula sylvestris of Gray's Man., ed. 7.) Yellow 



Cress. 



A weed in moist waste clay, clay loam, or alluvium; frequent. June-Aug. 15. 



Several places near the athletic field, C. U. campus ; cultivated grounds along the 

 drainage canal near the Ithaca fair grounds ; experimental grounds of the Depart- 

 ment of Floriculture, Agricultural College ; Cayuga Heights ; Union Springs. 



Newf. to Ont, southw. to Ala., Mich., and 111. Adventive from Eurasia. Recently 

 introduced in the Cayuga Lake Basin. 



2. R. palustris (L.) Bess. (Radicida palustris of Gray's Man., ed. 7. Nasturtium 



palustre of Cayuga Fl.) Marsh Cress. 



Low open grounds, in rich bottom-land soils, rarely in drier waste soils ; frequent. 

 June 20-Sept. 



Spencer Lake; Hudson St., South Hill, Ithaca; Cascadilla Glen (D. !) ; Ithaca 

 flats; Cortland marl ponds (D.) ; and elsewhere. 



Generally distributed almost throughout N. A. except in the extreme North. Found 

 also in Eurasia. 



2a. R. palustris (L.) Bess., var. hispida (Desv.) Rydb. 



In situations similar to the preceding ; more frequent. 



Summit Marsh (D.) ; Ithaca flats (D. !); Ellis Hollow; Cayuga Marshes (D.) ; 

 and elsewhere. 



Newf. to Alaska, southw. to Fla. and N. Mex. Found also in Eurasia. 



15. Nasturtium R. Br. 



1. N. Nasturtium-aquaticum (L.) Karst. (Radicula Nasturtium -aquaticum of 

 Gray's Man., ed. 7. Nasturtium officinale of Cayuga Fl.) Water Cress. 



Spring-fed brooks, rarely in more quiet waters, with no apparent relation to lime 

 content ; frequent, and locally abundant. June-July. 



Ditch along road to Slaterville ; Cascadilla Creek, above Judd Falls ; Cayuga 

 Heights, e. of golf links ; Red Mill Pond ; McLean ; and elsewhere. 



Newf. to Man. and Oreg., southw. to Va., Mo., Ariz., and Calif., including the 

 Atlantic Coastal Plain. Naturalized from Eurasia. 



18 The reasons for rejecting the generic name Radicula have been summarized by Sprague (Journ. 

 Rot. 62 : 225, 1924). Mackenzie (Rhodora 27 : 28, 1925, and 27 : 65, 1925) has shown that the 

 name Sisymbrium L. should apply to the water cress, but for this plant the name Nasturtium was 

 retained as a nomen conservandum at the Brussels Congress. Sisymbrium is used in its old sense 

 in the present flora, as the proper name for that genus has not been worked out and the necessary 

 combinations have not been made. The three segregates of Roripa — Roripa, Nasturtium, and 

 Armoracia — ■ seem to be as distinct from one another as are many other recognized genera of the 

 Cruci ferae. 



