1910] Moore, — Notes on Agropyron 205 
Many of them had only the typical setaceous submersed leaves, but 
others had sent up long (6-10 feet) slender branches, and developed 
"floating" leaves under water, along the upper portions. All the 
plants were fruiting abundantly, the fruits being strongly toothed on 
all three keels. This development of “floaters” under water seems 
unusual. The pond-level has not changed (save a few inches) for a 
great many years, and the plants could not have become accustomed 
to more shallow water, nor could floating leaves have been submerged 
by the raising of the water level. Further, the plants are growing near 
the center of a large pond. These submersed “floaters,” though on 
obviously etiolated stems and petioles, appear to be healthy, and to 
have lived successfully under conditions for which they are not fitted 
structurally. The occurrence of this plant in this form and habitat 
suggests that a shallow water form has become established in deep 
water, or that the habits of this variety are not sufficiently known. 
It seems possible that further investigation may show this plant to 
be a good species. 
TRIDENS FLAVUS (L.) Hitche. This tall, handsome grass was found 
in August, 1909, in Southboro, Massachusetts, abundant in old fields 
near the Sudbury Dam. It is a plant worthy of cultivation, and may 
be an escape, though it does not appear to be such. 
SOUTH FRAMINGHAM, MASSACHUSETTS. 
NOTES ON AGROPYRON. 
Chase, I was enabled to examine the type specimen of Agropyron 
tenerum Vasey var. longifolium Scribn. & Sin. U. S. Dept. Agr. Div. 
Agrost. Bull. no. 4, 30 (Feb. 6, 1897) at the United States grass 
herbarium and I am convinced that it is not separable from A. tenerum 
Vasey, to the synonymy of which I would therefore add it. 
Through the courtesy of Mrs. Agnes 
By an oversight of mine, it was stated in the recent article which I 
published in conjunction with Prof. A. S. Pease, RHODORA, xii, 61-77 
(April 18, 1910), that Vasey cites no specimens under his original 
description of A. Seribneri, Bull. Torr. Bot. Club, x, 128 (Dec. 1883). 
This is incorrect. Vasey cites two, but does not state which is the 
type specimen. The first is fully cited — “It was collected by Mr. 
C. G. Pringle in the Sierras in 1882, altitude 9,500 ft., and distributed 
as Triticum caninum L.?," as if it were the type specimen; while the 
second is merely referred to as follows: "It was collected the past 
