384 PONTEDERIACEA. 
Juan (Friedrichsthal).—Southward to Paraguay and Uruevay, and in the West Inpizs. 
Hb. Kew. 
2. Pontederia rotundifolia, Linn. Suppl. p. 192; Solms in DC. Monogr. 
Phanerog. iv. p. 533 (varietates 2); Kunth, Enum. iv. p. 127. 
Pontederia cordifolia, Mart. in Roem. et Schult. Syst. Veg. vii. p. 1147; Kunth, Enum. iv. p. 126; 
Seub. in Mart. FI. Bras. iii. 1, p. 95. . 
Nicaracua, without locality (Wright ; Lévy, 164).—Southward to Peru and BuENos. 
AYRES. 
9. EICHORNIA. 
Eichornia, Kunth, Enum. iv. p. 129; Benth. et Hook. Gen. Plant. iii. p. 838; Solms in DC. 
Monogr. Phanerog. iv. p. 525. 
Solms enumerates five species, all of which are American, and one also occurs in 
Tropical Africa and Madagascar. In America the genus ranges from Nicaragua and 
the West Indies to Peru and Paraguay. 
1. Kichornia azurea, Kunth, Enum. iv. p- 129; Solms in DC. Monogr. 
Phanerog. iv. p. 528; Abhandl. Naturf. Gesell., Halle, vi. p. 177, cum icone; Bot. 
Mag. t. 6487. 
Pontederia azurea, Swartz, Fl. Ind. Occ. i. p. 609. 
Nicaracua, San Juan (riedrichsthal), Greytown (Tate, 428); Panama, Barbacoas 
(S. Hayes)—Common nearly all over Tropical and Extratropical Soura America and 
the Wrst Inpizs. Hb. Kew. 
3. HETERANTHERA. 
Heteranthera, Ruiz et Pav. Fl. Peruv. et Chil. Prodr. p. 9, t. 2, et Fl. Peruv. et Chil. i. p. 48, 
t. 71; Benth. et Hook. Gen. Plant. ii. p. 838; Solms in DC. Monogr. Phanerog. iv. 
p. 516. 
Species nine, covering the whole area of the order in America and Tropical Africa. 
1. Heteranthera graminea, Vahl, Enum. ii. p. 45; Solms in DC. Monogr. 
Phanerog. iv. p. 517; Kunth, Enum. iv. p. 120. 
Leptanthus gramineus, Michx. Fl. Bor.-Am. i. p. 25, t. 5. fig. 2; Hook. Exot. Fl. t. 94. 
Schollera graminifolia, Willd. in Neue Schriften Gesell. Naturf. Freunde, Berlin, iii. p. 438 ; Torrey, 
Bot. U.S. & Mex. Bound. Surv. p. 223. 
Schollera graminea, A. Gr. Man. Bot. Northern U. S. ed. 5, p. 545. 
Commelina dubia, Jacq. Obs. iti. p. 9, t. 59. 
CANADA and OrEeGon to Trxas and CaLirornia.—NortH Mexico, near Matamoros in 
Tamaulipas (Schott). 
2. Heteranthera limosa, Vahl, Enum. ii. p. 44; Solms in DC. Monogr. 
Phanerog. iv. p. 518; Griseb. Fl. Brit. W. Ind. p. 90; A. Gr. Man. Bot. Nérthern U.S. 
