652 NATURAL HISTORY MISCELLANY. 
deemed worthy of record. Floating on the surface of a small 
pond on this island, which is opposite the east end of our city, I 
found, on July 16, 1871, an abundance of the flowering trisulca, 
associated with L. minor L. and L. polyrrhiza L. ; though the lat- - 
ter were greatly in the minority. I enclose specimens, from which 
will be perceived the remarkable difference of the plant from the 
usual submerged form. The flowering plant, it appears, is always 
of this small, compact, depauperate-looking type, and is provided 
with air-cavities which float it to the surface.. The fronds are 
mostly proliferous from but one side, and the stalks are either 
much reduced or wanting, only five or six generations being con- 
nected; from which it would seem that this is a young state. I 
was not able to observe whether the posterior stamen opens later 
in the day than the anterior one, as Dr. Engelmann has surmised ; 
but I found that a large number of the flowers had both stamens 
expanded at five o’clock, P. M. The exsert stamens were in such 
cases quite distinguishable by even the naked eye. Many of the 
plants were in bud, or about going to flower, having the anthers | 
still enveloped in the spathe. I have collected a quantity of spec- 
imens which I shall, be glad to distribute among my botanical 
friends. I hope to be able, at a later date, to secure the fruiting 
plant. 
Last season (June 7, 1870) I discovered in the greatest abun- 
dance L. minor L. in full flower, at Eaton Rapids, Michigan, the 
locality so celebrated for its mineral springs. ‘This plant also is 
rarely found flowering. — HENRY Gittman, Detroit, Michigan. 
LEMNA POLYRRHIZA IN Frowrr.—I have to add to my former 
discoveries of flowering Lemnas, the finding of Lemna polyrrhiza 
L. in full blossom. I found it, July 30, 1871, at the west or oppo- 
site end of the same pond on the Belle Isle, in the Detroit River, 
Michigan, in which two weeks previously I collected the flowering 
L. trisulea, Here the L. polyrrhiza was largely in the majority, 
though growing with L. minor and L. trisulca; all three species 
being in flower together! At four o'clock, P. m., I observed many 
of the flowers of the three Species with both stamens expanded. 
I was unable to reach the ground at an earlier hour. The ana- 
lyzed flower exhibits two ovules. I enclose specimens. L. poly- 
rrhiza was found in flower last year for the first time in America 
_ by Mr. Leggett of New York—and, I believe, the first time 
