384 PROCEEDINGS OF THE ACADEMY OF [1898. 



ERIOCAULOlSrE^J. 



39. Eriocaulon Benthami Kunth Enum., PI. Ill, 545 ; Biol. Centr. Amer. Bot., 



III, 443 ; Koern in Mart. Fl. Bras., Ill, 490. 



Recorded from South Mexico and Guatemala. Lake Xochimil- 

 cho on chinampas, Aug. 15 (97). 



PONTEDERIACE^. 



40. Eichornia azurea Kunth Enum., PI. IV, 129 ; Solms in DC. Monogr. Phanerog., 



IV, 528 ; Abhandl. Naturf. Gesell., Halle, VI, 177, cum icon.; But. Mag., t. 6,487. 



Pontederia azurea Swartz, Fl. Ind. occ. , I, 609. 



Common over Tropical and Extra-tropical South America and 

 the West Indies. Closely similar to the water hyacinth Piaropus 

 (Pontederia, Eichornia) speciosa Kunth, a native of South Amer- 

 ica. Whether this plant is indigenous to the canals and lakes of 

 the Valley of Mexico is a question ; at any rate it is very abundant 

 in many of the ditches in the City of Mexico, and is also found 

 abundantly floating about in Lake Xochimilcho. The related 

 Water Hyacinth is extremely troublesome to navigation in the riv- 

 ers of Florida. 6 



Lake Xochimilcho, Aug. 15 (88). 



POLYGONACEJE. 



41. Polygonum amphibium Linn., Sp. PL, 361; DC. Prodr., XIV, 115; A. Gr., 



Man. Bot. ed. 5, 416; Fl. Dan., t. 282. 



A very widely dispersed species in the temperate and subtropical 

 regions of the N. Hemisphere. Lake Xochimilcho on the edge of 

 the chinampas, Aug. 15 (91). 



NYMPHAEACEJE. 



42. Nympbsea Mexicana Zucc. in Abb. Akad. Muencb., I, (1832), 365 ; Flora (1832) 



II ; Beibl, 75 ; Biol. Centr. Amer. Bot., I, 26. 



The flowers of this plant are straw-yellow. Lake Xochimilcho, 

 Aug. 15 (100). 



43. Nymphaea tussilagifolia Lebm., Ind. Sem. Hort. Hamb. (1853), 10; Ann. Sc. 



Nat., ser. 4, Vol. I, 326. 



Collected by Lehman in Lake Chalco near Yotla, also found in 

 the Amazon. The flowers of this handsome water lily are white. 

 Lake Xochimilcho, Aug. 15 (101). 



6 See the Water Hyacinth and its Kelation to Navigation in Florida, Bull. 

 18, Div. of Bot. U. S. Dept. Agric, H. J. Webber. 



