. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. ZANNICHELLIACEAE. Vol. 20. Potamogeton Hillii Morong. Hill's Pond- weed. Fig. 193. Potamogeton Hillii Morong, Coult. Bot. Gaz. 6: 290. 1881. Stems slightly compressed, slender, widely branching, l°-2° long. Leaves linear, acute or cuspidate, or often almost aristate, i'-2l' long, i"-ii" wide, 3-nerved, the lateral nerves delicate and nearer the ma
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. ZANNICHELLIACEAE. Vol. 20. Potamogeton Hillii Morong. Hill's Pond- weed. Fig. 193. Potamogeton Hillii Morong, Coult. Bot. Gaz. 6: 290. 1881. Stems slightly compressed, slender, widely branching, l°-2° long. Leaves linear, acute or cuspidate, or often almost aristate, i'-2l' long, i"-ii" wide, 3-nerved, the lateral nerves delicate and nearer the margins than the midrib; stipules whitish, many-nerved, obtuse, 3"-s" long; peduncles about ¥ long, erect or slightly recurved, more or less clavate; spikes capitate, 3-6-f ruited; fruit obliquely obovoid, obtuse at the base, about 2" long, i"-i|" thick, 3-carinate on the back, the middle keel sharp and more or less undulate, flat on the sides, face slightly arched; style nearly facial, short; embryo coiled. In ponds, eastern New York to Michigan, south to Pennsylvania and Missouri. There are two forms of the species, the one 2-glandular at the base of the leaves, the other glandless. July-Sept. 21. Potamogeton foliosus Raf. Leafy Pondweed Potamogeton foliosus Raf. Med. Rep. (II.) 5: 354. 1808. Potamogeton pauciflorus Pursh, Fl. Am. Sept. 121. 1814. Not Lam. 1789. Potamogeton niagarensis Tuckerm. Am. Journ. Sci. (II.) 7: 354- 1849- Potamogeton foliosus niagarensis (Tuckerm.; Morong, Mem. Torr. Club, 3: Part 2, 39. 1893. Stems flattened, much branched, i°-3° long. Leaves 1-3' long, l"-i" wide, acute, 3-5-nerved, not glandular at the base; stipules white, hyaline, obtuse or sometimes acute, 6"-io" long; peduncles more or less clavate, erect, about ¥ long; spikes 4-12- flowered; fruit lenticular or nearly orbic- ular, about 1" in diameter, 3-keeled on the back, the middle keel winged, sinuate- dentate, often with projecting sho
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
