FERNALD, — ELEOCHARIS OVATA, 497 
of L. obtusa, but only about five eighths as broad as the achene: bristles 
few and short, generally none. — Bull. Torr. Club, x. 101; Britton, Bull. 
Torr. Club, xv. 100 (under EZ. Engelmanni}); Britton, Jour. N. Y. 
Microse. Soc. v. 102 (under Z. ovata). — On high sand-bars of the Con- 
necticut River, between Hartford and Wethersfield, Connecticut (Chas. 
Wright). A little known species ; not satisfactorily referable, however, 
to either of the older forms with which some authors have placed it. 
While studying the material associated with Hlsocharis ovata, the an- 
nual plants passing as E. intermedia were also examined. This compar- 
atively rare species is generally well understood, but a plant growing in 
marshes on the Gatineau River (a tributary of the Ottawa) has a very 
different achene, and it may well be distinguished, in recognition of its 
discoverer and his equally alert father, as 
E. Macounii. — Fig. 26¢.— Annual: culms slender, weak, the long- 
est 2 or 2.5 dm. long: heads elliptic-lanceolate, about 1 em. long, more 
densely flowered than in Z. intermedia (Fig. 25), the ovate-lanceolate or 
oblong-lanceolate acutisb or blunt scales dark brown: achene much com- 
pressed, obscurely triangular in cross-section, obovate, less elongated than 
that of £. intermedia (Fig. 26); the deltoid-conical tubercle nearly as 
broad and one half as high as the body of the achene. — Borders of 
marshes, North Wakefield, Quebec, Sept. 13, 1893 (James M. Macoun, 
no. 7552). In its elongated dark heads this Canadian plant more nearly 
resembles the European Z. carniolica than the American £. intermedia. 
From them both, however, it is clearly distinguished by its more com- 
pressed obscurely angled achene, and its much broader tubercle. 
ce 1 The reference here made by Dr. Britton to a note of Dr. Gray in Bot. Gaz. 
1. 81, must have arisen through a misapprehension, for the only plants mentioned 
by Dr. Gray in the place cited are true E. Engelmanni and its var. detonsa. 
VOL. Xxx1v. — 32 
