. 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. 33. Potamogeton pectinatus L. Fennel- leaved Pondweed. Fig. 206. Potamogeton pectinatus L. Sp. PI. 127. 1753. Stems slender, much branched, i°-3° long, the branches repeatedly forking. Leaves setaceous, atten- uate to the apex, i-nerved, i'-6' long, aften capillary and nerveless; stipules half free, l'-i' long, their sheaths scarious on the margins; peduncles f
. 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. 33. Potamogeton pectinatus L. Fennel- leaved Pondweed. Fig. 206. Potamogeton pectinatus L. Sp. PI. 127. 1753. Stems slender, much branched, i°-3° long, the branches repeatedly forking. Leaves setaceous, atten- uate to the apex, i-nerved, i'-6' long, aften capillary and nerveless; stipules half free, l'-i' long, their sheaths scarious on the margins; peduncles filiform, 2-12' long, the flowers in verticils; fruit obliquely obovoid, with a hard thick shell, 1V-2" long, i"-i£" wide, without a middle keel, but with obscure lateral ridges on the back, plump on the sides and curved or occasionally a little angled on the face; style straight or recurved, facial; embryo apex pointing almost directly toward the basal end. In fresh, brackish or salt water, Cape Breton to Brit- ish Columbia, south to Florida, Texas and California. Also in Europe. Pondgrass. July-Aug. 34. Potamogeton interruptus Kitaibel. Inter- rupted Pondweed. Fig. 207. Potamogeton interruptus Kitaibel in Schultes, OEst. Fl. Ed. 2, 328. 1814. Potamogeton flabellatus Bab. Man. Bot. Ed. 3, 343. 1851. Stems arising from a running rootstock which often springs from a small tuber, 2°-4° long, branched, the branches spreading like a fan. Leaves linear, obtuse or acute, 3'-5' long, i"-li" wide, 3-5-nerved with many transverse veins; narrow, 1-nerved leaves on some plants, these acuminate, as P. pectinatus; stipules par- tially adnate to the leaf-blade, the adnate part l'-i' long, sometimes with narrowly scarious margins, the free part , scarious, obtuse; peduncles i'-e' long; spikes interrupted; fruit broadly and obliquely obovoid, obtuse at the base, the largest 2" long and nearly as broad, with rounded lateral ridges on the bac
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
