622 



IOWA ACADEMY OF SCIENCE 



N. odorata, occurs in Lake Hopatcong, New Jersey. MacMil- 

 lan states that N. odorata and N. tuberosa occur together in 

 Minnesota. Fitzpatriek and Shimek report N. tuberosa from 

 Iowa. 



Unfortunately the separation of A T . odorata and N. tuberosa 

 is extremely difficult without fresh material and very complete 

 specimens or notes. Indeed, it may yet be proven that none 

 of the supposed distinctions are constant, and that the two 

 species cannot he maintained. The following table shows what 

 the differences are said to be. 



Nymphjea odorata Ait. 



NympHjEA tuberosa Paine. 



Flowers — 7-15 cm. across, open 

 , from 6 a. m. to 12 m., very- 

 sweet scented. 



Peduncle — purplish green, 0.3-0.5 

 cm. in diameter; coiled 5-£ 

 turns in fruit. 



Sepals — often purplish outside. 



Petals — 23-32, ovate to elliptic- 

 lanceolate. 



stamens — becoming linear or fil- 

 amentous at center of flower. 



Seeds — 0.23x0.16 cm.; aril one-' 

 fourth longer than seed. 



Leaves — usually more or less 

 purplish beneath; angles oJ 

 sinus not at all produced. 



Petioles — reddish green to dark 

 purplish red, evenly colored. 



Branches of rhizome — few, at- 

 tached by a base 1.3-2 cm. in 

 diameter. 



Stipiiles? 



Surface of poVcn? 



Relative length of stamens and 

 petals:' 



Flowers — 10-23 cm. across, open 

 from 8 a. m. to 1 (or 2-3) p. 

 m., odorless. 



Peduncle — green, 0.5-0 9 cm. in 

 diameter; coiled 3 turns in 

 fruit. 



Sepals — green. 



Petals — obovate or almost spat- 

 ulate. 



Filaments — nearly all broader 

 than anthers. 



Seeds — 0.44x0.28 cm.; aril about 

 as long as the seed, or shorter. 



1. races — pure green beneath, an- 

 gles of sinus slightly pro- 

 duced. 



Petioles — green, with longitudi- 

 nal red-purple stripes. 



Branches of rhizome (tubers) — 

 very numerous, attached by a 

 slender neck 0.3-0.8 cm. in di- 

 ameter and very readily de 

 taching. 



Stipules? 



Surface of pollen? 



Of all of these distinctions the most certain test is the pres- 

 ence or absence of tubers. Next best is the presence of stripes 

 of red-purple on the petioles in N. tuberosa. I have never 



