. Carnegie Institution of Washington publication. i68 THE WATERLILIES. Nymphaea tetragona, Georgi 1775, fid. original specimen from hb. Pallas, in hb. British Museum; 1800. Caspary 1865. Robinson 1896. Conard 1901 o. N. tetragonanthos, Pallas MS., in Sims 1813, fid. specimen cited above. N. pygmaea, Alton 1811. Sims 1813. Smith 1819. DeCandolle 18216, 1824. Sprengel 1823. Don 1831. Ledebour 1842. Turczaninow 1842. Planchon 18526; 18530 and 6. Lehmann 1853 o. Hooker & Thomson 1855. Loudon 1855. Hooker 1872. Garden 1883 b. Tricker 1897. Moenkemyer 1897. N. foliis cordatis integerrimis and N.
. Carnegie Institution of Washington publication. i68 THE WATERLILIES. Nymphaea tetragona, Georgi 1775, fid. original specimen from hb. Pallas, in hb. British Museum; 1800. Caspary 1865. Robinson 1896. Conard 1901 o. N. tetragonanthos, Pallas MS., in Sims 1813, fid. specimen cited above. N. pygmaea, Alton 1811. Sims 1813. Smith 1819. DeCandolle 18216, 1824. Sprengel 1823. Don 1831. Ledebour 1842. Turczaninow 1842. Planchon 18526; 18530 and 6. Lehmann 1853 o. Hooker & Thomson 1855. Loudon 1855. Hooker 1872. Garden 1883 b. Tricker 1897. Moenkemyer 1897. N. foliis cordatis integerrimis and N. alba minor, Gmelin 1769. N. pygmaea alba, Hort, Gerard 18900? Castalia pygmaea, Salisbury 1806 b. C. Leibergi, Morong 1888, fid. original specimens. G. & F. 1888. C. odorata var. minor, Macoun 1891 (in part) fid. specimen coll. J. M. Macoun, July 17, 1886, No. 94 from hb. Geol. and Nat. Hist. Survey, Canada, in hb. British Museum. Not N. odorata var. minor Sims 1814. C. tetragona, Lawson 1889. Britton & Brown FIG. 65.—Nympli'i:,' !• ^na: a, section of ovary; b, section of receptacle; c, outer, <i, inner sepal; f, outer, /, median, g, innermost petal; It, stamens. Natural size. DESCRIPTION.—Flower floating, to cm. across, open on 3 or 4 days from noon until 5 p. m., sweet-scented (or odorless, Britton & Brown 1897).—Peduncle slender, to cm. in diameter, terete, 10 to 30 cm. long, with 4 main air-canals.— Receptacle enlarging abruptly from the scape, distinctly tetragonal, with rounded angles, green.—Sepals 4, ovate to oblong-ovate or broadly lanceolate, breadth : length = 1 to , obtuse or slightly acute; opening horizontally or less, putrescent in fruit; green and veinless outside, white within; when dry, marked outside with short elevated lines.—Petals 8 to 17, rather thin, pure white (or faintly striped with purple lines, Morong 1888), about as long as the sepals, oblong, obovate or broadly lanceolate, or oblong
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