BOTANICAL GAZETTE. 273 
III. Peputs L. 
5. P. diandra Nutt. ed. DC. 1828: no. 49 of Koehn, Mon. 
le. vol. i. p. 263. (Callitriche autumnalis? Michx. 1805, sec. 
Watson: Didiplis linearis Raf. 1833: Hypobrichia Nuttallii M. O. 
Curt. ed Torr. et Gray, 1838-40: Ptilina aquatica Nutt. Ms. see. 
Endl.: Didiplis diandra Wood, 1855, sec. Watson: Ammannia 
Nuttallii Gray, Man. ed. 4.) From North Carolina and Florida 
through Illinois to Minnesota, St. Louis, and Texas. I can not 
detect differences of any weight between Didiplis and the true 
European Peplis. It is of little consequence that the flowers of 
the former are tetramerous, and those of the latter hexamerous, 
this character being variable in more than one genus of Lythra- 
cee. On the other hand, I can not agree with M. Baillon, who 
brings Peplis under Ammannia, for the European species of Pep- 
sare much nearer allied to Lythrum, by means 0 L. numnularu- 
folium Loisleur, than to Ammannia. As to the number of sta- 
mens of Peplis diandra, it is often said to be two, but the numer- 
ous flowers I examined were all tetrandrous. 
IV. Lyturvm L. sens. restr. 
Flowers solitary in the axils, rarely binate by an 
Fl ace ; wer. il 
owers oe Sore: ee rather small; 6. L. Hyssopifolia. 
8 
Flowers dimorphous: petals rather large; sta- 
mens 6, the dorsal ones inserted lower 
than the ventral ones. 
Ovary on a thick short stalk; no fleshy hypo- 
nous ring: leaves linear, almost al- 1. tare. 
flesh 1 
Calyx (with the accessory teeth) 1} to 64mm. 
stamens of the short-styled 
— exserted: leaves alternate, or 
the lower ones opposite. 
The fleshy hypogynous ring small, or very 
small, 
Leaves linear, or the cauline ones linear- “1, album 
lanceolate. : L. ovalifolium. 
Leaves suborbicular or oblong. Rae 
The height of the fleshy ring equalling its 
iameter. : 
Leaves oblong-linear or lanceolate, with 10. L. lanceolatum. 
nN acute or cuneate base. : a, 
Leaves oblong or linear-lanceolate, with 11. L. alatum. 
* a cord ase. 
Calyx (with the accessory teeth) 8 to 14mm. 
height of the fleshy ring 
eter. 
Leaves linear, alternate : — of the 12. L. Californicum. 
