176 THE WATERLILIES. 



AT. venusta, Hentze 1848 b; 1852 a, fid. specimens coll. Hentze from hb. Lehmann, in hbb. Kew, 



Berlin. 

 N. rotundifolia, Hentze 1848 b; 1852 a, fid. specimens coll. Hentze, from hbb. Lehmann and Caspary, 



in hbb. Kew, Eerlia 

 N. erythrocarpa, Hentze 1852 b = N. alba Hentze 18480; 18520, fid. specimen coll. Hentze, from 



hb. Lehmann, in hb. Berlin. 

 N. parviflora, Hentze 18486; 18520, fid. specimens coll. Hentze, from hb. Lehmann, in hbb. Kew, 



Berlin. 

 N. spleitdens, Hentze 1848 a; 1852 c, fid. specimens coll. Hentze, from hb. Lehmann, in hbb. Kew, 



Berlin. 



N. urceolata, Hentze 18486; 18520, fid. specimen from hb. Lehmann, in hb. Berlin. 

 N. alba var. intermedia Gave 1892; fid. original specimen coll. P. Gave, June 30, 1891, St. Andre, 



Haute Savoie. 



Castalia sfeciosa, Salisbury, 1806 a. Britten 1888 a. 

 C. alba, Woodville & Wood 1806. Link 1831. Greene 1888. Lawson 1889. 



DESCRIPTION. Flower floating, 7 to 15 cm. in diameter, open on 4 days from 7 

 a. m. to 4 p. m. (7 a. m. Upsala; 8 a. m. Innsbruck, Kerner 1895), (5 p. m. Schulz 

 1890), faintly sweet-scented on first day of opening, odorless afterward. Peduncle 

 terete. Receptacle rounded along the line of insertion of the sepals. Sepals 4 (rarely 3 

 or 5, Eichler 1875) oblong or ovate, obtuse or somewhat acute, smooth, opening out 

 horizontally or more, putrescent in fruit, green mostly shaded with reddish-brown out- 

 side, whitish or pale reddish within, stiff, obscurely 7-nerved. Petals 12 to 24, of rather 

 firm texture, outermost opening horizontally, grading inward in size, shape and position 

 to the stamens. Outermost petals about as long as the calyx, lanceolate to oblong, or 

 ovate, obtuse, white, often striped with green, gray, or reddish on the back Stamens 64 

 to ico or more, covering the torus to its summit, innermost first to ripen. Outer ones 15 

 to 17 mm. long, innermost 4 to 5 mm. long. Anthers sulphur-yellow to orange-yellow, 

 sickel shaped with the convexity inward, inserted at an angle with the filament, the 

 angle being slight in the outer stamens, reaching 90 in the innermost; lines of de- 

 hiscence facing inward and downward; outermost anthers 10 to 12 mm. long, inner- 

 most about 3 mm. Filaments curved, convex side outward, bringing the anthers over 

 the middle of the flower; outer filaments white, petaloid ; innermost filament filiform, 

 yellow, narrower than the anther. Pollen aculeate, operculum smooth ; 0.038 mm. in 

 diameter. Ovary slightly contracted below the stigma, covered with stamens to the 

 summit. Carpels 8 to 24 (mean = 12 to 20) ; styles fleshy, triangular-ovate, rounded 

 at apex, more or less concave and i to 5 sulcate on inner side, sulphur yellow, often 

 tinted orange. Stigmatic area scarcely produced above to the bases of the styles, end- 

 ing acutely. Stigma more or less deeply depressed, basin or funnel shape, sulphur- 

 yellow. Axile process conical, acute, yellowish-white. Fruit globose or depressed- 

 globose, crowned with the styles, which are bent sharply inward. Inner wall of fruit 

 cells whitish, spongy; tissues green or blood-red. Ripe fruit yellowish-green outside, 

 devoid of floral leaves. Seed 3 mm. long by 2 mm. in diameter, ellipsoidal or ovoid, 

 dark olive green, smooth ; raphe evident. Aril inclosing the seed, open at end opposite 

 hilum, and with irregular margin. 



Submerged leaves of adult plant 2 or 3, broadly deltoid; lamina about 10 cm. 

 across, with stomata on upper epidermis; petiole 10 cm. long; leaves produced in fall, 

 or in unfavorable conditions. (Cf. Arcangeli 1890 b.) 



