291 : 
1.—APONOGETON. 
l. A monostachyon, Lina. f.; Hook. f. Fl. Brit. Ind. 
E i. 564. 
Hongkong New Territory without locali s ; pools near 
Canton. Fl. white, August. 
2.—POTAMOGETON. 
Key to species. 
Leaves flat, ovate ; i e. dl. Gaudichaudii. 
Leaves crisped, linear .. ies sibs pve OTS 
[d 
. P. Gaudichaudii, Cham. et Schlecht. ; P. mucronatus, Presl ; 
Hook. f. Fl. Brit. Ind. vi. 567. Canton. . green. 
. P. erispus, Lz inl "Hook. f. l.c. 566. Pond near Swatow. FI. 
pink, Apri 
bo 
3.—RUPPIA. 
l. R. maritima, Zinn.; R. rostellata, Koch; Hook. f. l. e. 568. 
Sheko Lagoon, Hongkong. Fl. January. 
4.—ZANNICHELLIA. 
. Z. pedicellata, Ham.; Z. palustris, subsp. pedicellata, 
Hook. f. l. c. 568. Near Swatow. Fl. white, April. ; 
— 
5.—NAJAS. 
l. N. graminea, Delile; N. minor, Benth. Fl. Hongk. 345. 
Hongkong without locality. Fl. ——. 
ERIOCAULONACEAE. 
1.—ERIOCAULON. 
a 
1. Stem oiik fux Ves e . setaceum. 
Stem not elong oat ted 
2. Involucral bracts longer than the flowers 2. echinulatum. 
Involucral bracts not vas than the 
ers ; T sia » : 
3. Leaves pillose ... i. . 3. australe. 
Leaves glabrous sas “ee ave ph 
4. Involueral bracts villose i we 4. Wightianum. 
Involucral bracts glabrous — ... iie 5. 
5. Sepals of male flowers dim ees 6. 
Sepals of male flowers Gerini tte E 
6. Floral bracts acute — ... Ves rr Mni sinicum. 
e» 
oral bracts obtuse... um as . truncatum. 
21515 ES 
