270 WILLIS: MORPHOLOGY OF THE PODOSTEMACEÆ 
(22) Im Thurn, Among the Indians of Guiana, Loudon, 1888, p. 105. 
(23) Jussieu, A. de, in Delessert, leones Select., iii., 91-94 
(Hydrostachys). 
(24) Klotzsch, in Peters, Reise Mossamb. Bot., 506, t. 52 
(Hydrostachys). 
(25) Kohl, Kalksalze und Kieselsäure in d. Pfl., Marburg, 1889, 
p. 249. 
(26) Kurz, in Journ. As. Soc. Bengal, xlii., 1873, ii., 103. ' 
(27) Bindley, Vegetable Kingdom, p. 482. 
(28) Martins & Zuccarini, Nov. Gen. et sp., I., 6, 1822. 
(29) Michaux, Flora Bor.-Am., ii., 164, t. 44, 1803. 
(30) Möller, Cladopus Nymani, Ann. Jard. Bot. Buitenz., xvi., 
1899, p. 115. 
(31) Müller, Fr., in Nature, xix., 1879. 
(32) Richard, in H. B. & K., Nova gen. et sp., I., 246, 1815. 
(33) Spruce, Notes on Plants collected chiefl}^ in the Rio Uaupes 
in 1852. Herb. Kew, quoted in Goebel, Pfl. Sch., ii., 335. 
(34) Strasburger, Bau und Wachsth. d Zellhäute, 1882. 
(35) Thwaites, Enum. PI. Zeylan., p. 222. 
(36) Trimen, in Journ. Bot., xxiii., 1885, p. 173. 
(37) do. Flora of Ceylon, iii., 415, and v., 386 (Willis). 
(38) Tulasne, Podost. Synopsis Monographica, Ann. d. Sc. Nat., 
III. ser., t. xi., 1849, p. 87. 
(39) do. Monographia Podostemacearum, Arch, du Mus. 
d’Hist. Nat., vi., 1852. 
(40) do. in Martii Flora Brasil., IV., pars 1, 1855, p. 229. 
(41) Wächter, Weddellina squamulosa, in Flora, 83, 1897, p. 367. 
(42) Warming, Familien Podostemaceæ, I. -VI., Kgl. Dansk. 
Vidensk. Selsk. Skr. 6 Kaekke, ii., 1881, ii., 1882, iv., 1888, 
vii., 1891, ix., 1899, xi., 1901. 
(43) do. Podostemaceæ, in Engler & Prantl, Nat. Pflanzenfam., 
III., 2a, p. 1, 1890, and Nachtrag, p. 179. 
(44) do. Note sur le genre Hydrostachys, Bull. Ac. roy. 
danoise, 1890. 
(45) do. Podostemaceæ, Flora of Koh Chang, Bot. Tidsskr, 1901. 
(46) Weddell, Monograph in DC. Prodr., xvii., 1873, p. 39. 
(47) do. A new African genus of P., Journ. Linn. Soc. Bot., 
XIV., p. 208, 1874. 
(48) do. Sur les P. en gén. et leur distr. géog. en partie.. 
Bull. Soc. Bot. France, XIX,, 1872, p. 50. 
(49) Wight, Icônes Fl. As., V., p. 31, t. 1,916-1,920. 
(50) Willis, A Revision of the Podostemaceæ of India and 
Ceylon, Ann. Perad., L, 1902, p. 181. 
(51) do. Additions and Corrections to Ceylon Flora. Tri- 
men, Flora of Ceylon, V., 1900, p. 386. 
(52) do. in Nature, vol. 61, Nov. 1899, p. 68. 
(53) Woodrow, in Rec. Bot. Survey India, I., p. 95, 1895. 
