. 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. 2. Philotria angustifolia (Muhl.) Britton. Narrow-leaved Water-weed. Fig. 249. Serpicula verticillata angustifolia Muhl. Cat. PI. Am. Sept. 84. 1813. ?Serpicula occidentalis Pursh, Fl. Am. Sept. 33. 1814. ?Apalanthe Schweinitzii Planch. Ann. Sci. Nat. Bot. III. n: 76. 1849. Philotria angustifolia Britton; Rydb. Bull. Agr. Exp. Sta. Colo. 100: 15. 1906. Dioeciou
. 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. 2. Philotria angustifolia (Muhl.) Britton. Narrow-leaved Water-weed. Fig. 249. Serpicula verticillata angustifolia Muhl. Cat. PI. Am. Sept. 84. 1813. ?Serpicula occidentalis Pursh, Fl. Am. Sept. 33. 1814. ?Apalanthe Schweinitzii Planch. Ann. Sci. Nat. Bot. III. n: 76. 1849. Philotria angustifolia Britton; Rydb. Bull. Agr. Exp. Sta. Colo. 100: 15. 1906. Dioecious water plant; stem slender, flaccid, i°-3i° long. Leaves in 3's or 2's, sessile,, linear, s"-io" long, about i" wide, rarely i" wide, acute; spathe of the staminate flowers i"-ii" long; sessile, ovoid; sepals and petals elliptic or oval, the former about 1" long, the latter smaller; anthers about i" long; spathe of the pistillate flowers tubular, i"-i" long; hypanthium iJ'-4' long; sepals and petals elliptic, the former l"-i" long; stigmas In streams New York and. Pennsylvania to Florida. 3. Philotria Nuttallii (Planch.) Kydb. Nuttall's Water-weed. Fig. 250. Serpicula verticillata Muhl. Cat. Am. Sept. 84. 1813. Not S. verticillata L. 1781. Anacharis Nuttallii Planch. Ann. & Mag. Nat. Hist. II. 1: Philotria Nuttallii Rydb. Torrey Club 35: 461. 1908. Dioecious water-plant; stem slender, i°-3i° long; with the internodes often longer than the leaves. Leaves usually in 3's or the lower ones in 2's, sessile, oblong or lance-oblong, acute, 2i"-s" long, l"-ii" wide, finely serrulate; spathe of the staminate flowers ovoid, sessile, 2i"-3" long; flower without a tube; sepals and petals oblong, the former scarcely exceeding the oblong an- thers,, which are i"-ii" long;- sheath of the pistillate flowers about 5" long,. 2-cleft; tube of the hypanthium 2-6'.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
