2oo THE WATERLILIES. 



We are doubtful if the true N. rubra exists in this country. Seed communi- 

 cated by Mr. Chandradatta of Calcutta has germinated but produced no flowering 

 plants as yet. It was introduced into England in 1803. 



N. devoniensis at Lyon House, England, in 1885 produced a flower whose 

 peduncle arose from the axil of a stamen of a previous flower (Barber 1889), and 

 Dr. Kirk, according to Masters (1869), observed a similar abnormality in N. lotus in 

 East Africa. The sepals, petals, stamens and even carpels of these species may become 

 leaf-like (Masters 1869). 



We have to admit that our arrangement of the Lotos group is far from being 

 satisfactory or final. Important results would certainly follow a study of the plants 

 of various parts of Africa, Asia and the outlying islands. This can only be done effec- 

 tively on living plants, either in cultivation or in their native haunts. The several 

 forms in gardens have proven useless on account of uncertainty of origin and proba- 

 ble admixture of other stocks by crossing. 



Subgenus 5. HYDROCALLIS, PLANCHON 1852 b; 1853 a. 



Flowers nocturnal, floating. Sepals not evidently veined. Petals in whorls of 4, 

 alternate with the sepals and with each other. Stamens inserted in series with the 

 petals, the outermost 4 or 8 more or less petaloid and in whorls like the petals ; anthers 

 dehiscing about simultaneously. Styles slender, cylindric, with enlarged dub-shaped 

 tips. Seeds small or minute, with numerous long hairs. Leaves entire, or dentate- 

 sinuate with obtuse teeth. Rhizome erect, tuberous, drying off in the resting season. 

 Ten known species, natives of the tropics of the Western Hemisphere. 



Hydrocallis, Caspary 1878; 1888. 

 Castalia (in part), DC. 1821 b. 



Tribe Leucanthos (in part), Chamaelotus (in part), Lotos (in part) and Castalia (in part), Leh- 

 mann 1853 a. 



Nymphaea amazonum, Martins & Zuccarini. (Plate XIX.) 



Number of floral parts 132 to 376. Sepals ovate-oblong, more or less acumi- 

 nate. Petals 16 to 20, rows all about equidistant. Stamens 93 to 297. Pollen 0.0142 

 to 0.0174 mm. in diameter. Carpels 19 to 40. Fruit with funnel-shaped stigmatic disc, 

 the funnel surface curved ; sepals and outermost row of petals persistent. Seeds 10,000 

 to 27,000, very small, 0.386 mm. wide by 0.706 mm. long to 0.566 mm. by 0.973 mm., 

 dull gray. Mature leaf entire, lobes subacuminate or rounded. Top of petiole bear- 

 ing a ring of long hairs. Tuber producing stolons throughout its vegetative period. 

 Flowers imperfectly opening two nights, becoming fully open suddenly the second 

 night between 4 and 5 o'clock a. m. Bud ovate-oblong, acuminate. 



Nymfhaca amazonum, Martins & Zuccarini 1832, fid. specimens coll. Martins, No. 3313, near Para, 

 Brazil, in hbb. Munich, Berlin. Planchon 18536. Lehmann 18530. Hooker 1854. Caspary 

 1878. Sagot 1881. Conard 1901 a. 



N. albo-viridis, St. Hilaire 1833, fid. specimen coll. St. Hilaire, Prov. Rio de Janeiro, Brazil, in lib. 

 Paris. 



N. blanda, Macfadyen 1837. Hort. Glasnevin (fid. Hooker, I. c.). Not Meyer 1818. 



N. blanda P Amazonum, Planchon 1856. 



N. Rudgeana ft Amazonum, Grisebach 1864. Not N. rudgcana Mey. 1818. 



