REVISION OF THE SPECIES OF LOPHOTOCARPUS. 151 
other specimens of this from Connecticut and the shores of 
Long Island, but from lack of full notes concerning habit 
of growth I have heretofore referred them to S. feres. 
Mr. Eaton says: ‘‘ This is peculiar on account of the 
extensive propagation by offshoots. It spreads by under- 
ground rootstocks or rhizomes, sometimes a dozen plants 
being joined, thus forming a complete carpet on the 
bottom in shallow places. The winter roots are like those 
of other Sagittarias. It likes positions where alternately 
covered and uncovered by the tides or where the sandy 
shore is ripple-swept. In the latter places it multiplies 
rapidly where its leaf-tips just emerge. Usually it is sub- 
merged and only blooms when it is so, at least for a part 
of the day by the tides. Its flowers open when the water is 
half way up. It does not seem to spread after it has been 
entirely left by the water, even though growing on the 
mud flats where it is very damp, It undoubtedly grows in 
all of our ponds with sandy shores.”’ 
EXPLANATION OF PLATES. 
Plates 57 and 58 were drawn from the type material by 
Mr. A. H. Baldwin; the others, by Mr. J. B. S. Norton. 
Plate 53, L. jluitans. — Plant, one-half size, and achenium, with cross- 
section of same, « 5. 
Plate 54, Z. Californicus. — Plant, one-half size, and immature ache- 
nium, < 5. 
Plate 55, L. depauperatus. — Plant, natural size; achenium and cross- 
section of the same, 5. 
Plate 56, Z. spongiosus.— Plant, one-half size; achenium and cross- 
section of the same, 5. 
Plate 57, L. spatulatus.— 1, Plant, natural size; 2, sepal, x 5; 3, petal; 
4, stamen, X 20; 5, achenium with cross-section, < 10. 
Plate 58, Sagittaria Hatoni. —1, Plant, one-half size; 2, flowering 
branch, one-half size; 3, sepal, X 5; 4, petal; 5, stamen; 6, pistil. 
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