aay in Sa Atel att ig i 9 Ta a, aie 
_ REVISION OF EPILOBIUM. 73 
Behrens, Botanik, p. 82; Luerssen, Jahrb. wiss. Bot. vil. 
p. 46, pl. 5, f. 27-30; Mohl, Ann. Sci. nat., ser. 2, ili. p. 
332 (the original paper published in German at Berne in 
1834); Strasburger, Bau und Wachsthum der Zellhaute 
(Just, x. 1, p. 416); Tschistiakof’, Bot. Zeitung, xxxili. p. 
81, and Jahrb. fiir wiss. Bot. x. p. 7, with several plates ; 
and Halsted and McBride in Bull. Torrey Bot. Club, 1890, 
p. 238. 
While the larger flowered species appear to be regularly 
proterandrous, the duration of the dichogamy is brief in 
most of them, and the smaller flowered species seem to be 
always synacmic and self-fertile, although with the proba- 
bility of frequent intercrossing by aid of insects attracted 
by the nectar which is secreted within the calyx tube (see 
Behrens, Flora, 1879, p. 246, and Bonnier, Ann. Sci. nat., 
ser. 6, viii. p. 115, note), and commonly protected by the 
dilated bases of the filaments or a nectar guard of hairs 
within the calyx. In Z. spicatum the broad filaments are 
supplemented in this protective function by hairs on the 
lower part of the style. The principal publications on the 
pollination of the genus are as follows: Beal, Amer. Nat. 
xiv. p. 203; Beyer, Spontanen Bewegungen, Wehlau, 1888 
(Just, xvi. 2, p. 523); Delpino, Alcuni Appunti, p. 19, 
Ulteriori Osservazione, ii. 2, p. 159, Bot. Zeitung, 1869, 
810, and Malpighia, i. (Just, xv. 1, p. 318); Gray, 
Amer. Naturalist, 1876, p. 43, Amer. Agriculturist, 1876, 
p. 142, and Struct. Bot. p. 222; Henslow, Pop. Sci. Rev. 
1879, p. 8; Kerner, Flowers and their Unbidden Guests, 
p- 102; Kirchner, Program, 68 Jahresfeier Wiirttemb. 
Landw. Akad. Hohenheim, 1886 (Just, xiv. 1, p. 790), 
and Flora von Stuttgart, p. 412 e¢ seq. ; Lubbock, Nature, 
x. p. 403-5, and Brit. Wild. Fl. in rel. to Insects, index; 
Miiller, Alpenblumen, p. 209, Befruchtung der Blumen, p. 
189, Nature, ix. p. 165, and Weitere Beobachtungen, p. 
237; Schulz, Bibliotheca Botanica, Heft 10, p. 35, and 
Heft 17, p. 73 and 118; Sprengel, Entdecktes Geheimniss, 
p.4 and 223-224; Thomson, Trans. Bot. Soc. Edinburgh 
