449 NAIADACEZ. 
CanaDa southward.—Mexico, Morales (Schaffner).—Also recorded from the Sanp- 
wicH ISLANDs. - 
8. Potamogeton pectinatus, Linn. Sp. Pl. ed. 1, p. 127; Kunth, Enum. PL 
iii. p. 187; A. Gr. Man. Bot. Northern U.S. ed. 5, p. 490; S. Wats. Bot. Calif. ii. p. 198. 
CanapA to CALIFoRNIA and Fioripa.—SoutH Mexico, near the city of Mexico 
(Bourgeau, 321), in one small lagoon near Chapultepec (Schaffner); Bretisii Honpvuras, 
Belize (Bernoulli).—Evurore ; Asta; AFricaA; AustTRALIA. Hb. Kew. 
9. Potamogeton perfoliatus, Linn. Sp. Pl. ed. 1, p. 126; Kunth, Enum. Pl. 
iii. p. 133; Chapman, Fl. Southern U.S. p. 446; S. Wats. Bot. Calif. ii. p. 197. 
Canapa to CALIFORNIA and FLoripaA.—GuaTEMALA, Laguna de Atitlan, near San Lucas 
(Bernoulli, 600).—Evropz; Norra Asta; West AFrica; AUSTRALIA. Hb. Kew. 
3. NAIAS. 
Naias, Linn, Gen. Plant. n. 1018; Benth. et Hook. f. Gen. Plant. iii. p. 1018. 
About ten species, inhabiting fresh water in nearly all Temperate and Tropical 
regions. 
1. Naias flexilis, Rostk. et Schm. Flora Sedin., ex Kunth, Enum, Pl. iii. p. 114; 
A. Gr. Man. Bot. Northern U.S. ed. 5, p. 483; Cham. in Linnea, iv. p. 501. 
Naias canadensis, Michx. Fl. Am.-Bor. ii. p. 220 ; A. Gr. loc. cit. 
Canapa southward.—Souta Mexico, Hacienda de la Laguna (Schiede & Deppe), 
lagoons around Mexico (Schaffner); Nicaragua, Greytown (Tate).—Also widely 
dispersed in Europe and Asia. Hb. Kew. 
Order CLVITI. ERIOCAULE. 
Eriocaulee, Benth. et Hook. Gen. Plant. iii. p. 1019. 
Of this Order six genera are defined by Bentham and Hooker, all of which, except 
an African one of three species, are represented in America, where three of them are 
endemic ; while the remarkable genus Pepalanthus, comprising upwards of 200 species, 
is restricted to America, with the exception of a single species found in South Africa ; 
and only one species of the genus occurs in North America, the rest being South- 
American and having their greatest concentration in Brazil. Altogether there are 
about 325 species of this Order. 
1. ERIOCAULON. 
Eriocaulon, Linn. Gen. Plant. n. 100; Benth. et Hook. Gen. Plant. iii. p. 1020. 
This genus numbers about 100 species, widely diffused in warm countries, and a few 
occur in Temperate regions. 
