. 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. Genus i. PONDWEED FAMILY. 11. 5. Potamogeton epihydrus Raf. Nuttall's Pondweed. Fig. 178. Potamogeton epihydrus Raf. Med. Repos. II. 5 : 354. 1808. Potamogeton Nuttallii Cham. & Schl. Linnaea, 2: 226. pi. 6. f. 25. 1827. Potamogeton Claytonii Tuckerm. Am. Journ. Sci. 45: 38. 1843. Stems slender, compressed, i°-6° long. Float- ing leaves opposite, elliptic t
. 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. Genus i. PONDWEED FAMILY. 11. 5. Potamogeton epihydrus Raf. Nuttall's Pondweed. Fig. 178. Potamogeton epihydrus Raf. Med. Repos. II. 5 : 354. 1808. Potamogeton Nuttallii Cham. & Schl. Linnaea, 2: 226. pi. 6. f. 25. 1827. Potamogeton Claytonii Tuckerm. Am. Journ. Sci. 45: 38. 1843. Stems slender, compressed, i°-6° long. Float- ing leaves opposite, elliptic to obovate, obtuse, short-petioled, i4'—34' long, 4"-i2" wide, many- nerved ; submerged leaves linear, 2-ranked, 2'-7' long, 1 "-3" wide, 5-nerved, the 2 outer nerves nearly marginal, the space between the 2 inner and the midrib coarsely reticulated; stipules ob- tuse, hyaline, not keeled; peduncles i'-s' long; spikes i'-l' long; fruit round-obovoid ii"-2" long, i"-ii" thick, 3-keeled, the sides flat and indistinctly impressed; style short, apical; embryo coiled one and one-third times. In ponds and streams, Newfoundland to British Columbia, North Carolina and Iowa. Creek-grass. June-Aug. 6. Potamogeton alpinus Balbis. Northern Pondweed. Fig. 179. Potamogeton alpinus Balbis, Misc. Bot. 13. 1804. Potamogeton rufescens Schrad.; Cham. Adn. Fl. Ber. 5. 1815. Plant of a ruddy tinge; stems simple or branched, somewhat compressed. Floating leaves spatulate or oblanceolate, obtuse, many-nerved, tapering into petioles i'-s' long; submerged leaves semi- pellucid, the lowest sessile, the uppermost petioled, oblong-linear or linear-lanceolate, obtuse or rarely acute, narrowed at the base, 3'-i2* long, 2"-q" wide, 7-nerved; stipules broad, faintly 2-carinate, obtuse or rarely acute; peduncles 2'-8' long; spikes i'-ii' long; fruit obovoid, lenticular, red- dish, ii" long, 1" thick, 3-keeled, the middle keel sharp, the face arched
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
