 | Missouri Botanical Garden - 1895 - 272 Seiten
...Minnesota and Nebraska. — Plate 18. Specimens differ greatly in size and form of leaf, differences depending largely on the habitat of the plant. When...spongy blades, or the tapering attenuate phyllodia are bladeless. This is the S. heterophylla rigida of the manuals and collectors. When growing in shallow... | |
 | Indiana. Department of Geology and Natural Resources - 1897 - 830 Seiten
...shape of leaf. June 10. 33.* (227.) 8. KIGIDA Pursh. Sessile-fruiting. Arrow-head. (S. heterophyUa Pursh.) Borders of ponds ; frequent. May 22. . "Specimens...tapering attenuate phyllodia are leafless. This is the S. heieropkylla rigida of Gray's Manual, 6th ed."* This form occurs sparingly in Vigo County, having been... | |
 | Indiana. Department of Geology and Natural Resources - 1897 - 830 Seiten
...shape of leaf. June 10. 33.* (227.) S. RIGIDA Pursh. Sessile-fruiting. Arrow-head. (S. tieterophylla Pursh.) Borders of ponds ; frequent. May 22. "Specimens...tapering attenuate phyllodia are leafless. This is the S. lieterophylla rirjida of Gray's Manual, 6th ed."* This form occurs sparingly in Vigo County, having... | |
 | Missouri Botanical Garden - 1895 - 270 Seiten
...Minnesota and Nebraska. — Plate 18. Specimens differ greatly in size and form of leaf, differences depending largely on the habitat of the plant. When...spongy blades, or the tapering attenuate phyllodia are bladeless. Thia is the 8. heterophylla rígida of the manuals and collectors. When growing in shallow... | |
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Pursh.) Borders of ponds ; frequent. May 22. . "Specimens differ greatly in size and form of leaf, the difference depending largely on the habitat of the plant. When growing in deep pools or running streams the petioles become thick, rigid and elongated,... 