82 Rhodora [May 
the south shore of the island. Here, on June 25, 1911, it was only 
just in bloom, and in many of the tufts the panicles were only 
beginning to show. It was in full flower on Long Island, July 4, 1903, 
and July 11, 1911, and on Marthas Vineyard, July 7, 1913. 
ELYMUs AUSTRALIS Scribn. & Ball. 
On Chappaquiddick Island, Marthas Vineyard, this grass grows 
sparingly among low shrubbery along the top of a high bluff overlook- 
ing Katama Bay. Collected September 13, 1910, then mostly dried 
and brown, but still erect, the largest spikes 15 cm. long. Agrees per- 
fectly with authentic material in Herbarium of the New York Botani- 
cal Garden. Apparently not reported hitherto from north or east of 
Connecticut. 
PANICUM BARBIPULVINATUM Nash. 
Collected on Marthas Vineyard, October 1, 1909, in a boggy spot 
at the north end of Sengekontacket Pond; only a few plants were 
found. Determined at the New York Botanical Garden by Mr. 
George V. Nash and Doctor P. L. Rydberg. 
This Panicum appears not to have been recorded from east of Illi- 
nois and Wisconsin; yet it has every appearance of being indigenous 
on Long Island, where it grows, often in luxuriant abundance, in 
damp places along the shore or among the sand dunes, on the 
Rockaway Peninsula and at Long Beach. It comes into flower late 
(no panicles fully expanded September 5, 1909) and continues to 
bloom until killed by frost. 
PANICUM SCOPARIUM Lam. 
Abundant on a dry level tract near the shore south of the herring 
run at Great Pond, Marthas Vineyard. When first discovered there, 
October 6, 1909, it was mostly dried and brown, but had passed a 
season of vigorous growth. The following year, on September 19, 
much better specimens were collected bearing fresh and very numer- 
ous secondary panicles, the primary panicles having lost all their 
spikelets. 
Has previously been reported from Massachusetts, at Cape Cod, 
(Hitchcock & Chase, Cont. Nat. Herb. 15: 295, 1910). 
TRIDENS FLAVUS (L.) Hitch. 
Abundant on a low grassy knoll flanked by trees and thickets on 
the west side of Sengekontacket Pond, Marthas Vineyard. In full 
flower, September 29, 1909. 
This grass appears not to have been known from Massachusetts 
