270 BOTANICAL GAZETTE. 
Capsule dehiscent, with 3 or 4 elegant septicide 
valves. Petals 4. 
Calyx tubulose. Petals 6. Stamens 12. ) pedi 
Flowers solitary, but on very long (12-28mm.) pedi- 
Petals generally 6. Stamens 12o0r13. VI. Nesma. 
I, RoraLa 
IV. Lyrarvum. 
are reduced to a single axillary flower. 
Capsule bursting irregularly. Petals generally 4, 
or none, owers not trimor 8. 
Capsule 3-valved, or rarely 4-valved, loculicide. 
etals 5, rarely 4. Stamens 10, rarely 8. Flow- 
ers trimorphous. 
II. AMMANDIA- 
VII. Decopon. 
I. Roraua L. sens. ampl. 
Petals 4: accessory teeth of the calyx as long as the 
r. 
obes or shorte 1. R. ramosior. 
Petals 0: accessory teeth of the calyx thrice as long as ‘ 
the lobes, subulate. R. dentifera. 
1. R. Ramosror Koehne, no. 3 of Monograph, |. ¢. vol. i. p- 
157. (Ammannia ramosior L. Sp. PI. 1752, nec L. Mant., nee 
Pursh: A. humilis Miche. 1808: Boykinia humilis Rat. 1817: 
Peplis occidentalis Spreng. 1825: Ammannia catholica Cham. et 
Schl. 1827: A. occidentalis DC. 1828 ; Chapm. 1865, pro parte: 
A, monoflora Blanco, 1837: Isnardia ascendens Hall ed. Eat. se¢- 
A. Gray.) From Boston and Florida to St. Louis and Texas; 
also in California and Oregon from the Yosemite Valley to the 
Columbia River; then from Mexico and the West Indies to Bra- 
zil and Ecuador, and on the Philippine Islands, It will be 
rather difficult, I fear, to convince North American botanists of 
the necessity of separating the genus Rotala from Ammannia, for, 
unfortunately, the only species met with in the United States has 
mmannia-like habit, which is not to be observed in the ; 
other species of Rotala. The African R serpiculoides only bears 
a character of the genus Amimannia, having its flowers dispo 
in axillary sessile cymes, i 
high authority as Bentham and Hooker, who brought Rotala asl 
Ammannia, I can not but insist on the diversity of the twe 
genera, for the latter differs from Rotala no less than from L yt if 
rum. oever may have occasion to examine a great number 0 
species of Rotala will be struck by the peculiarities, by whieh ee 
genus proves to have pursued a course of evolution re ae 
vergent from that of Ammannia. The principal distinctive char - 
acters of the two are the following: the capsule of Ane é 
bursts Irregular] y, that of Rotala separates into 3 or 4 septic 
valves, Also, a bit of the capsule wall of Rotala mounted “ 
water, and examined with a magnifying power of twenty diam a 
