. Elementary botany. Botany. 402 ECOLOGY. water. The second zone then is in the water shown in the fore- ground of the picture. The plants here are also submerged, or only a small portion reaches the surface of the water, and so the. Fig. 495. Sagittaria heterophylla. Often forms a zone just outside of the Sagittaria variabilis. zone does not show. In this zone occurs the curious Vallesneria spiralis, with its corkscrew flower stem, and various potamoge- tons. 715. In the third zone, or the first one which shows in the picture, are great masses of the arrow-leaf (sagittaria) so variable. Pleas
. Elementary botany. Botany. 402 ECOLOGY. water. The second zone then is in the water shown in the fore- ground of the picture. The plants here are also submerged, or only a small portion reaches the surface of the water, and so the. Fig. 495. Sagittaria heterophylla. Often forms a zone just outside of the Sagittaria variabilis. zone does not show. In this zone occurs the curious Vallesneria spiralis, with its corkscrew flower stem, and various potamoge- tons. 715. In the third zone, or the first one which shows in the picture, are great masses of the arrow-leaf (sagittaria) so variable. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atkinson, George Francis, 1854-1918. New York, H. Holt
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