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 1897. 



FIG. 65. Nympli'i:,' ! im.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, 3.3 to 7.6 cm. across, open on 3 or 4 days from 

 noon until 5 p. m., sweet-scented (or odorless, Britton & Brown 1897). Peduncle 

 slender, 0.3 to 0.4 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 = 

 1:1.16 to 3.61, 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-elliptic, apex obtuse or somewhat acute, narrowed 

 toward the base, grading into the stamens. Stamens about 40, with golden yellow 

 anthers, shorter than the petals (stamens 12 to 16 in the American plant, in 3 or 

 4 rows, running up the ovary about half way, Morong 1888) ; outer stamens shorter 

 than median ones; outermost filaments elliptic or obovate to lanceolate-oblong, very 

 broad, narrowed toward the base (inserted up to the summit of the ovary, Casp. 1865 ; 

 Turcz. 1842) ; outermost anthers shorter than median and inner, cells diverging below, 

 sometimes only one cell developed. Median stamen with filament as in outer, but nar- 

 rower ; cells of anther parallel. Innermost stamens very short, filaments slender, cells 



