134 



The Waterlilies. 



(approx.), margins straight or slightly concave, converging toward the periphery; 

 angles about 3.2 cm. apart, tapering, acute. Petiole slender, light brown, attached to 

 the lamina by a slender " collar " ; principal air-canals 4, two larger and two smaller ; 

 stellate cells numerous on walls of larger canals. 



Rhizome (tuber) erect, ovoid, black, thickly covered with leaf scars, about 7.5 cm. 

 long by 3.5 cm. thick, ripening early in the fall. No stolons formed in vegetative 

 period. Small tubers (Fig. 14), 1.2 to 1.35 cm. in diameter, spherical-ovoid, smooth 

 in lower half, tapering above to the scaly-woolly vegetative end. 



Measurements in centimeters. 



* Measurements in this table and those marked a in adjoining tables are from the same flower. 



Geographic Distribution. Texas, Mexico to Guatemala, chiefly in warm low- 

 lands. " Near head of Leona River " (Gray 1850) ; Waco, Texas (Sterns 1888) ; Rio 

 Grande, El Paso, Texas (Coulter 1890) ; Guatemala (Smith 1893) ; Tamaulipas, Vera 

 Cruz, and Mazatlan, Mexico; Brownsville, Texas (coll. Pringle, Flora of Texas, 1888, 

 No. 1955). Also coll. Berlandier, No. 2402, June, 1834, at Palo Alto, Rio de las Mines, 

 Mexico, in hbb. Kew, Paris, and No. 972 in hb. Berlin ; coll. Hartweg, Mexico, No. 1972 

 in hb. Paris and 1592 in hb. Delessert. 



Notes. Types collected by Dr. C. Wright on Leona River in June, 1849, and 

 sent to A. Gray, and thence with seeds to Hooker, who raised plants and described 

 the species from them. It was rediscovered in 1887 by Misses Trimble and Wright 

 at the Waco locality in eastern-central Texas. 



The flower is beautiful and delicately colored ; the plant grows easily and blooms 

 and fruits profusely. 



Nymphaea ampla (Salisb.) DC. (Plate V.) 



Leaves 15 to 40 cm. in diameter, sub-orbicular, narrowly peltate, sinuate or nearly 

 entire, with small black spots above and below, at least when young; under surface 

 red-purple; lobes acute. Flowers white, 7 to 13 cm. in diameter; sepals ovate-lanceo- 

 late, obtuse or somewhat acute, marked with blackish lines; petals 7 to 21, lance- 

 ovate, obtuse; stamens 30 to 190, yellow, outermost ones much longer than innermost. 



Castalia ampla, Salisbury 1806 a, 1806 b. 



Nymphaea ampla, DC. 18216, 1824 (fid. leaf of original specimen, in hb. British Museum). Spren- 



gel 1825. Don 1831. Macfadyen 1837. Schomburgk 1848. Gray 1850. Planchon 1853 b. 



Grisebach 1864. Caspary 1878. Garden 18836. Watson 1883. Hemsley 1888. Pringle 



1890. Gray, etc., 1895. Conard, 1901 0. 



