FORMS AND DISTRIBUTION OF BATRACHIUM. 101
2i. ASPERGILLIFOLIUS,
Batrachiam aspergillifoUum, Dumort. Monogr. Renonc. 14- (18f)3). Originally noticed in Flanders. I have not seen an authentic speci- men. This form, or one closely related to it, occurs in England, and also in the south of France. Resembles circinatus by its distant and rigid leaves with regular outline, but differs from it by its shorter pe- duncles, and by the lateral position of the leaves, not surrounding the stem. It also approaches tricliopJiyllm, between which and circinatus it is intermediate.
R.paucisiamine/is, Tausch in Flora, vol. xvii. ii. 525 (1834). Batrachium aquutile, var. trichodes, Doll ex Martens et Kemmler, Fl. Wiirt. et Hohenzoll. p. 8 (1865). Batrachium pancistamineum, Schur. Enum. PL Transsilv. p. 13 (1866). Includes Drouetii, confervoides, and at least the smaller- flowered states of tricliopliijllm. Forms 25, 28, 29.
R. aqiiatilis, (3. p/zellai/dri/oli/ts, Schum. En. PI. Saell. vol. i. p. 171 (1801), includes these forms and probably also submersus. R. slenopetalus, Syme in Rep. Lond. Exch. Club, 1869, p. 7, non Hook. Ic. Pl.'t. 677 (1844), was defined as a species to include those in the third edition of ' English Botany,' named trichophyllns, Drouetii, Jieteropliyllus, Syme ; that is, the forms radians, Godrouii, trichophyllus, Drouetii, and submersus of this paper. It is a useful name to apply to certain intermediate states that cannot be further identified with any other published name.
25. TRICHOPHYLLUS.
R. tricJiophyllus, Chaix in Villars, Dauph. vol. i. p. 335 (1786). R. divaricatus, 'SicXwavk, Baier. Fl. vol. ii. p. 104 (1789), non Koch, etc. R. aquatilis, e. pantothrix, Koch in Sturm. Deutschl. Fl. hf. 67. f. (1835). Batracliium bipoutinum, F. Schultz iu Gren. et Gotb". Fl. Fr. vol. i. p. 24 (1848). Batracliium mliosura, F. Schultz, 1. c. Batrachium- tricho- phyllum. Van den Bosch, Fl. Bat. Prodr. 5 (1850). Fig.— English Botany, Suppl. t. 2968 ; Fl. Dan. t. 2357 ; Cosson and Genu. Atl. t. 2. f. 4.
Occurs in Norway, Sweden, Scotland, England, Ireland, Belgium, France, Brunswick, Switzerland, Bavaria, Italy, S. E. Australia (state very near this form). Rocky Mountains and Oregon, (Nuttall ! ; state near caspitosus), India (a weak state approaching Drouetii). A state with long peduncles occurs in Sweden ; it approaches marinus, but the carpels are hairy. According to Boreau, R. Bauhini, Tausch in Flora, vol. xvii. ii. p. 525 (1834), belongs to this form. Var. brachypns, Hook, and Arn. Bot. Beech, p. 316 (1841), has the peduncles and internodes shorter than the leaves, which have very slender segments ; it occurs in Califor- nia, Douglas ! A state with rather more rigid and less finely divided and submersed leaves, and with a few subtripartite floating leaves, occurs also in California.
26. RIGIDUS.
R. rigidns, Godr. Essai, f. 10 (1839), non Pers., nee Roth.
Occurs at the Cape of Good Hope (Drege ! 7605), India (Ste^vart ! 5000 ft. alt. ; a small form with fewer carpels and longer peduncles, but nearer to this form than to any other). Specimens from the Cape show a complete succession of states from rigidns to Drouetii.
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