TAXONOMY NYMPHAEAE APOCARPIAE. 127 



21. Styles 12 to 16 mm. long N. gardneriana 



21 . Styles 4 to 10 mm . long 22 



22. Sepals with black markings 23 



22. Sepals marked with dark crimson lines 24 



22. Sepals marked with fuscous striae 25 



23. Spots few, large ; leaves large, broadly peltate N. lasiophylla 



23. Spots few, linear ; leaves small, narrowly peltate A^. tenerinervia 



24. Leaves green above and below A 7 , blanda 



24. Leaves marked beneath with dark purple forked and branching lines N. jamesoniana 



25. Leaves very narrowly peltate, small A^. stenaspidota 



25. Leaves larger and more peltate N. gibertii 



26. Rhizome erect 27 



26. Rhizome horizontal ; flowers white or pink 29 



27. Flowers yellow ( Xanthantha) N. mexicana 



27. Flowers white, small (Chamaenymphaea) 28 



28. Leaves plain green above N. fennica 



28. Leaves more or less blotched with brown N. tetragona 



29. Leaves crowded on the rhizome ; European or Asiatic 30 



29. Leaves scattered on the rhizome ; American 31 



30. Line of attachment of sepals to receptacle sharply angular N. Candida 



30. Line of attachment of sepals rounded N. alba 



31 . Petals spatulate ; rhizome tuberiferous N. tuberosa 



31. Petals elliptic ; rhizome not tuberiferous N. odorala 



Group I. NYMPHAEAE APOCARPIAE (=LYTOPLEURA Casp. 1865, 1878, 1888). 



Carpels free from one another at the sides, fused along part of the suture with the 

 axis of the flower, and dorsally with the perigynous torus. Tropical species with 

 diurnal flowers ranging in color from blue through pink to white, raised 7 to 30 cm. 

 above the water, on stiff peduncles. Venation of sepals inconspicuous. Outermost 

 stamens first to dehisce, innermost last. Principal air-canals in the peduncle 6 (5 to 7). 

 in the petiole 2 ; idioblasts very few ; multicellular ingrowths rather frequent in the 

 air-canals. Rhizomes erect, tuberous, drying off in the resting season. Plants gla- 

 brous throughout, except on the apical portion of the tuber and the base of the petioles 

 and peduncles. 



Subgenus i. ANECPHYA Casp. 1865, 1888. 



Carpellary styles absent. Stamens, very many, with narrow filaments and short, 

 curved anthers, without appendage, or simply mucronate, inserted very densely at the 

 summit of the torus around the stigmatic disc, the outermost being at some distance 

 from the insertion of the innermost petals. Seeds larger than in the next section. 

 Flowers appearing subtended each by two leaves, i. e., there are on the rhizome oblique 

 series of flower bases alternating with two series of leaves. One species, in Australia 

 and New Guinea. 



Sec. Cyanea, Planchon 18526, 18536 (in part). 



Sec. Appendiculatae, trib. Cyananthos, Lehmann 18530 (in part). 



Sec. Inappendiculatac, trib. Castalia, Lehm. 185311 (in part). 



