The Flora of the Cayuga Lake Basin 191 



Hartwrightii at Malloryville Bog, s. w. corner of Cayuga Lake, Lowcry Ponds, and 

 Salt Pond w. of Howland Island. House (Bui. N. Y. State Mus. 254) follows 

 Greene in considering the American plants distinct from the European, and adopts 

 the name P. fluitons Eaton for the American material. Stanford (Rhodora 27: 125. 

 1925) holds the same view but recognizes P. natans Eaton as an older name than 

 P. fluitans Eaton. The writers have had no opportunity to check this point. 



8. P. coccineum Muhl. (See Rhodora 27:127. 1925. P. Muhlenbergii of dray's 



Alan., ed. 7, and of Cayuga Fl.) 



Rich mucky marshes and ditches, frequently extending to gravelly or sandy situa- 

 tions ; apparently not in strongly limy soils ; frequent. Aug.-Sept. 



Summit Marsh (D. !) ; Inlet Marshes and Cayuga Lake shore (here first noted by 

 Dr. Gray in 1831, D.) ; "near Ludlowville Sta. and north to Lake Ridge Pt., where 

 it is abundant" (D.) ; Ledyard, 1827 (/. /. Thomas); Union Springs (£>.!) ; 

 Canoga (D.) ; Montezuma Marshes. 



Que. and Me. to B. C, southw. to Va., La., Calif., and Mex. ; found sparingly on 

 the Atlantic Coastal Plain. 



An ecological form of this species corresponding to the aquatic form of P. aniphib- 

 ium is forma natans (Wiegand) Stanford (see Rhodora 26:3, 1924, and 27:152, 

 164, 1925). It has floating stems, and floating, glabrous, thicker, and more glossy 

 leaves. It can usually be distinguished from P. amphibium by the more acute leaves, 

 the longer spikes (3-9 cm. long), and the deeper pink color of the flowers. This 

 variant has been found in the Inlet and Montezuma Marshes, and transitional speci- 

 mens were collected in the small pond west of Fleming Meadow. 



9. P. Hydropiper L. Smartweed. Water Pepper. 



Swales, meadows, and damp pasture lands, mostly in exsiccated ground but in 

 various soils with no apparent relation to lime content ; common. Aug.-Sept. 



Almost throughout N. A., except in the extreme North ; possibly introduced in the 

 Cayuga Lake Basin. Found also in Eu. 



10. P. robustius (Small) Fernald. (See Rhodora 23:147. 1921. P. acre, in part, 

 of Cayuga Fl. and of Gray's Man., ed. 7.) 



In the shallow water of swales ; rare. Aug.-Sept. 



A plant of the larger marshes and swales: Inlet Marshes, 1874 (without collector's 

 name) ; near the Clyde River H miles n. w. of Marengo {A. J. E., K. M. W '., & 

 L. P. Randolph) ; road, Clyde to Savannah (same collectors). [Cortland mill pond.] 



N. S. to R. I., N. Y., Mo., and southw. Exact range not clear, but chiefly a plant 

 of the Coastal Plain. 



11. P. punctatum Ell. (P. acre, in part, of Cayuga Fl. P. acre, var. leptostachyum, 

 of Gray's Alan., ed. 7.) Water Smartweed. 



Marshy or boggy places, often in water, in various soils with little reference to 

 lime content ; frequent. Aug.-Sept. 



Spencer Lake; Renwick woods and vicinity; Dryden Lake; Beaver Brook; Chicago 

 Bog ; Cortland marl ponds ; abandoned canal, Cayuga ; moor of Lowery Ponds ; and 

 elsewhere. 



Almost throughout N. A., except in the extreme North, including the Atlantic 

 Coastal Plain. 



The characters given in the key seem sufficient to warrant the recognition of this 

 as a distinct species, as has been done by Fernald. P. punctatum Ell. is an earlier 

 name than P. acre HBK. 



12. P. hydropiperoides Alichx. Mild Water Pepper. 



Wet places and shallow water, mostly in sandy or gravelly swales along streams 

 and about lake shores, with little or no relation to lime content; infrequent. Aug.- 

 Sept. 



