Vor. II.] BUCKBEAN FAMILY. 623 
2. Limnanthemum aquaticum (Walt.) Britton. Larger Floating Heart. 
(Fig. 2891.) 
Anonymos aquatica Walt. F1. Car. 109. 1788. 
Villarsta aquatica Gmel, Syst. 1: 447. 1791. 
Menyanthes trachysperma Michx. Fl. Bor. Am, 
1: 126. 1803. 
Limnanthemum trachyspermum A. Gray, Man. 
Ed. 5, 390. 1867. 
Limnanthemum aquaticum Britton, Trans. N. 
Y. Acad. Sci. 9:12. 1889. 
Similar to the preceding species but stouter 
and larger, Floating leaves cordate-orbicular, 
thick, entire or repand, 2/-6’ long, spongy, 
and with the petioles and stolons densely 
covered with minute pits; primary leaves 
spatulate; pedicels slender, 1/—3’ long; tubers 
linear-oblong, thicker; corolla white, 6’/-10/’’ 
broad; style none; seeds rough; capsule longer 
than the calyx. 
In ponds, southern New Jersey and Delaware 
to Florida and Texas. Tubers apparently less 
abundant than in Z. lacunosum. May-Aug. 
3 Limnanthemum nymphaeoides (L.) Hoffm. & Link. Water Lily 
Floating Heart. (Fig. 2892.) 
Menyanthes nymphaeoides V,. Sp. Pl. 145. 
1753+ 
Limnanthemum nymphaeoides Hofim. &. 
Link, Fl. Port. 1: 344. 1809. 
Stems long, creeping or buried in the 
mud, ascending to the surface of the water, 
branched, the upper nodes bearing a 
petioled leaf and acluster of flowers, or the 
upper internodes very short and their 
leaves apparently opposite. Petioles stout, 
mostly longer than the ovate-orbicular 
firm blades, which are 2/-4’ broad; pedi- 
cels stout, becoming 3/-6’ long, not ac- 
companied by tufts of tubers; flowers bright 
yellow, 1’ in diameter, or more; corolla 
segments short-fringed. 
Naturalized in ponds, District of Columbia. 
Native of Europe and Asia. May-July. 
