. Une flore illustrée du nord des États-Unis, le Canada et les possessions britanniques, de Terre-Neuve jusqu'au parallèle de la limite sud de la Virginie et de l'océan Atlantique à l'ouest jusqu'à la 102d méridien. La botanique, la botanique. 84 ZANNICHELLIACEAE. Tome I. 26. Potamogeton lateralis Morong. Potamot à feuilles opposées. Fig. 199. Potamogeton lateralis Morong, Coult. Bot. Gaz. 5 : Si. 1880. Tiges très ramifiées, filifoYm. Feuilles flottantes sur pousses stériles uniquement, coriáceas, elliptiques, obtuses, 4" 5" de long, 1 "-2" de large, 5-7-nerved, les nerfs profondément impressionné en dessous, généralement je

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. 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. 84 ZANNICHELLIACEAE. Vol. I. 26. Potamogeton lateralis Morong. Opposite-leaved Pondweed. Fig. 199. Potamogeton lateralis Morong, Coult. Bot. Gaz. 5: Si. 1880. Stems filifoYm, much branched. Floating leaves on sterile shoots only, coriaceous, elliptic, obtuse, 4"_5" long, 1 "-2" wide, 5-7-nerved, the nerves deeply impressed beneath, usually in 1-3 opposite pairs which stand at right angles to the stem, on petioles 3"-io" long; submerged leaves linear, acute, 1-3' long, "-" wide, 1-3-nerved, 2-glan- dular at the base, but the glands small and often obsolete; stipules small, hyaline, many- nerved, obtuse, deciduous; peduncles and floating leaves lateral, with a peculiar appearance, widely spreading at maturity, sometimes recurved, thickening in fruit, 4"-is" long; spikes capitate or often interrupted, 3-4-flowered; fruit obliquely obovoid, about 1" long, lenticular, the back much curved and 2-grooved, the face arched and surmounted by the nearly sessile stigma; curve of the embryo oval, its apex nearly touching its base. In lakes and slow streams, Massachusetts and Connecticut. Proliferous shoots at the^ sum- mit of the stem and on the upper branches appear late in the season, as the plants are beginning to decay. July-Aug. A rare and local plant, which, in an incompletely developed state, when it lacks the broad floating leaves, has the aspect of P. pusillus; its affinities are probably with P. Vaseyi and P. diversifolius.. 27. Potamogeton pusillus L. Small Pondweed. Fig. 200. Potamogeton pusillus L. Sp. PI. 127. 1753. Potamogeton panormitanus Biv. Sic. PI. 1806-7. Potamogeton pusillus polyphyllus Morong, Coult. Bot. Gaz. 5 : 51. 1880. Potamogeton pusillus sturrockii A. Bennett i

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