TAXONOMY NYMPHAEA MEXICANA. 163 



Group II. NYMPHAEAE SYNCARPIAE (SYMPHYTOPLEURA, Casp. 1865, 1878, 1888). 



Carpels completely fused with one another at the sides ; attached also to the axis 

 of the flower and to the torus as in Group I. Stamens not appendiculate. Flowers 

 white, rose, purple or yellow, never blue; nocturnal or diurnal. 



Subgenus 3. CASTALIA DC. 1821. 



Flowers diurnal, usually floating. Sepals not evidently veined. Stamens inserted 

 in series with the petals and grading into them in size and shape ; innermost stamens 

 with narrow filaments. Styles linear, more or less ligulate. Leaves entire or sinu- 

 ate or crenulate, never sharply dentate. Rhizomes not protected against drought, but 

 lying dormant in cold weather. Plant glabrous except on the rhizome and bases of 

 petioles and peduncles. Seed smooth. Seven species, found in all of the North Tem- 

 perate Zone, except the Pacific Slope of North America. 



Castalia and part of Lotos, Planchon 18526, 18536. 



Sec. II. Inappendiculatae, trib. III. Castalia (in part), Lehmann 1853 a. 



Castalia and Xanthantha, Caspary 1888. 



A. XANTHANTHA CASPARY 1888. 



Flowers yellow, opening near noon and closing in the late afternoon. Outermost 

 stamens first to dehisce. Pollen smooth. Seed very large. Floating leaves sinuate, 

 more or less blotched with reddish brown. Principal air-canals in peduncle 4, in 

 petiole 2 ; idioblasts in course of petioles and peduncles stellate only. Rhizomes 

 erect, short, giving rise to numerous long stolons or runners which propagate the plant 

 very widely during summer, but produce in autumn on geotropic stolons characteristic 

 brood-bodies, consisting of a row of buds and a cluster of short fleshy roots (resem- 

 bling those of Limnanthemum). One species, native in Florida, Southern Texas, and 

 Mexico. 



Nymphaea mexicana Zuccarini. (Plate XIII; Figs. 63, 64.) 



Flowers 6 to 13 cm. in diameter, bright yellow; sepals and petals elliptic, ovate 

 to lanceolate, acute or rather obtuse. Receptacle with four swollen ridges. Leaves 

 floating or aerial, orbicular to ovate, narrowly peltate, nearly entire or denticulate-wavy, 

 10 to 18 cm. in diameter, with the petiole inserted much nearer the lobes than the apex ; 

 upper surface blotched with brown, at least when young; lower surface deep purple 

 or purplish-green (green in aerial leaves), with small blackish spots. 1 



Nymphaea mexicana, Zuccarini 18320 and b, fid. original specimens, coll. Karwinski, Sept., 1827, 

 " aus dem See bei Mexico," in hb. Munich. Planchon 1853 b. Hemsley 1888. Pringle 

 1890. Gerard 18906; 1891. Plank 1896? Tricker 1897. Conard 19010. Not Gray 1850. 



N. fiava, Leitner 1838. Gray 1876, fid. original specimens. Treat 1877. Meehan 1880. Chapman 

 1883. Carriere 1884. Hooker 1887, fid. original specimen in hb. Kew. Gray, etc., 1895. 

 Tricker 1897. Conard 1901 a. 



N. lutea, Treat 1877. Not Linn. 1753. 



Castalia flava, Greene 1888. 



1 Referred to in the text as " N. fiava " wherever the material used was from Florida plants 

 directly or in cultivation. 



