436 LEMNACEA. 
1. Lemna gibba, Linn. Sp. Pl. ed. 1, p. 970; Hegelm. Lemn. p. 145, tt. 11, 12, 
13. figg. 1-9. 
Telmatophace gibba, Schleid. in Linnea, xiii. p. 391 ; Kunth, Enum. Pl. iii. p. 6. 
Sour Mexico, canals near Mexico and Tacubaya (Bourgeau, 64), Vera Cruz to 
Orizaba (Miller), without locality (Hahn).—EURoPE ; Asia?; AFRICA; AUSTRALIA; and 
widely dispersed in America. Hb. Kew. 
This was collected intermixed with Lemna valdiviana var. minima, and Wolffia 
columbiana, W. gladiata, and W. lingulata. 
9. Lemna minor, Linn. Sp. Pl. ed, 1, p. 970; Hegelm. Lemn. p. 149, tt. 9,10; 
Kunth, Enum. Pl. iii. p. 4; Liebm. Om Mexicos Aroideer, p. 3. 
Lemna minuta, H. B. K. Nov. Gen. et Sp. i. p. 872; Schleid. in Linnea, xii. p. 390. _ 
Soura Mexico, Chinantla, Puebla at 7000 feet (Liebmann), without locality (Hahn). 
—This species is spread over nearly the whole area of the Order. Hb. Kew. 
The Mexican specimens were associated with Wolffia gladiata. 
3. Lemna paucicostata, Hegelm. Lemn. p. 139, t. 8. 
Lemna minor, auct. plur. (non Linn.), ex grat. Griffith Notul. et Hegelm. in Seem. Journ. Bot. 
1865, p. 112. 
Guatemata (Friedrichsthal).—Mussouri to the Wust Inpres and CoLomsta, and widely 
dispersed in Asta; also occurring in Arrica and the Fit IsLanps. 
4. Lemna polyrhiza, Linn. Sp. Pl. ed. 1, p. 970; Wolff, Monogr. p. 28, 
tt. 16-21. | 
Spirodela polyrhiza, Schleid. in Linnea, xiii. p. 392; Kunth, Enum. Pl. iu. p. 7; Hegelm. Lemn. 
p. 151, tt. 13 (figg. 10-16), 14 et 15. 
SoutH Mexico, without locality, associated with L. valdiviana var. minima (Hahn).— 
Europe, especially central; Maperra; Eeypr; Asia; AvustraLtia; NortH AMERICA; 
West Inpies; VENEZUELA. Hb. Kew. 
5. Lemna trisulca, Linn. Sp. Pl. ed. 1, p.790; Kunth, Enum. Pl. i. p. 5; 
Schleid. in Linnea, xiii. p. 391; Hegelm. Lemn. p. 134, tt. 5 et 6. figg. 1-18. 
Sours Mexico, without locality, growing with Wolffia gladiata (Hahn), near the city 
of Mexico (Berlandier); Nicaragua, Chontales (Seemann).— Europes ; ALGERIA; Mav- 
Rit1us; Asta; Avustratia; North America. Hb. Kew. 
6. Lemna valdiviana, Philippi in Linnea, xxxiii. p. 239; Hegelm. Lemn. 
t. 7. figg. 1-8. | 
New Jersey to New Mexico.—Sovurn Mexico, without locality (Hahn).—Bo.ivia 
and VaupiviA in South America. Hb. Kew. 
Hahn’s Mexican specimens are intermixed with Wolffia gladiata, W. lingulata, and 
W. columbiana. 
