. Carnegie Institution of Washington publication. TAXONOMY—NYMPHAEA MEXICANA. 165 Leaves of mature plant floating, or aerial and 7 to 12 cm. above the water, broadly ovate to orbicular, evidently peltate, entire, or more commonly sinuate or cren- ulate-wavy at base, becoming entire or slightly emarginate at apex; green above, with brown mottlings, at least on the floating leaves; under surface deep purplish-red, often becoming greenish, marked with small blackish dots. Primary veins scarcely visible, 5 to 10 on each side, depressed from the second fork outward.—Sinus short, depth : length of l
. Carnegie Institution of Washington publication. TAXONOMY—NYMPHAEA MEXICANA. 165 Leaves of mature plant floating, or aerial and 7 to 12 cm. above the water, broadly ovate to orbicular, evidently peltate, entire, or more commonly sinuate or cren- ulate-wavy at base, becoming entire or slightly emarginate at apex; green above, with brown mottlings, at least on the floating leaves; under surface deep purplish-red, often becoming greenish, marked with small blackish dots. Primary veins scarcely visible, 5 to 10 on each side, depressed from the second fork outward.—Sinus short, depth : length of leaf = i: to ; margins nearly straight, slightly separated or over- lapping ; angles slightly or evidently produced, obtuse or somewhat acute, made promi- nent by a deep concavity of the margin of the leaf on outer side of lobe. The aerial leaves may become concave above by the overlapping of the sinus margins.—Petiole with two main air-canals placed transversely, and two smaller ones placed anteriorly and posteriorly; stellate cells small, numerous, short armed.—Stipules fused into a single entire lanceolate organ, thin, membranaceous and translucent; apex rounded; cm. long by cm. wide, standing erect and clasping the younger leaves; smooth, and uniform in thickness. Rhizome erect ( cm. long by cm. thick), becoming as much as 30 cm. long and 5 to 6 cm. thick (Treat 1877), densely cov- ered between the leaf bases with long, light-colored hairs, and on the sides marked with large, projecting, spirally arranged leaf cushions, which are about cm. apart from center to center. From the upper part of the rhizome naked stolons to cm. in diameter are given off; these pass along under the mud in which the plant grows for a distance of 15 or 20 cm. to I meter, when the terminal bud turns upward and forms a new plant; in a few weeks the new plant again sends out runners, and the connection with the parent stem dies away. In autumn the stolons beco
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