296 BOTANICAL GAZETTE. [| November, 
‘There are some new varieties; other varieties reduced to 
forms ; and others wholly omitted. 
In the letter communicating the above list of Andro- 
pogons (dated June 10), Professor Hackel says: ‘*As to 
other Andropogonee, there are some changes in nomencla- 
ture, viz.: Imperata brevifolia Vasey is I. Hookeri Rupr. : 
‘Elionurus candidus’ from Texas and Arizona is not E. can- 
didus Hackel in Flor. Brazil., but a new species named E, bar- 
biculmis: ‘Elionurus Nuttallianus’ of Vasey, Grasses of 
the U.S., is the type of E. tripsacoides HBK.: Rottbeellia 
corrugata Baldw. is recognized as a species, with the variety 
areolata: R. tesselata Steud. is a form of R. corrugata: R. 
rugosa has a var. Chapmani (Curtiss, no. 3622).”’ 
Washington, D.C 
Notes on the inflorescence of Callitriche.! 
JOSEPH SCHRENK. 
While examining the flowers of Callitriche heterophylla 
Pursh, I noticed some peculiarities about the so-called dracts 
by one of the attenuated ends to the stem, the concave sides 
turned toward the pistil. 
f such bracts, including those met with in other families, 
Hydrillee, Naiadez, Potamez, etc., Schen oe ser 
elaborate paper on the ‘Comparative anatomy of submersed 
sa 
ers of cells. They originate early at the apex of the stem, 
develop more rapidly, and perish sooner than the neighbor- 
ing leaves. Probably they all produce a secretion which en- 
fea before Section F, A. A. A. 8., August 16, 1888. 
n the numerous specimens i i two pistils in 
one — the stamen was idvariatly wand, , noticed that when there were P 
ibl. bot , Vol. I, 1887, p 10.—Phe “M. itrichs,”” by Fr. Hes: 
elmaier (1864) Iwas’ ores . ¢ ‘*Monograph on the genus C wlitrich2, ts of 
consult, and had to be satisfied with the statemen 
Schenck t ¢.) and de Bary (Comp. Anat.) referring win” 
