2. NupharSM. 



About a dozen or more species and their variants in the North Temperate Zone. 

 1. Nuphar luteum subsp. macrophyllum (Small) E. O. Beal. Yellow cow-lily, 



SPATTERDOCK. Fig. 443. 



Perennial aquatics with procumbent branching cylindrical rhizomes: leaves 

 spirally arranged, with a deep sinus at the base; petioles and peduncles with 

 numerous minute air-cavities; exposed leaves floating or emergent and erect, 

 broadly ovate to suborbicular. to 3 dm. long or more and 25 cm. wide, with over- 

 lapping to divergent basal lobes, glabrous to more or less pubescent on lower sur- 

 face; submersed leaves (when present) thin and translucent, essentially like the 

 floating ones in size and shape; petioles terete to more or less flattened above, 

 glabrous to pubescent; flowers to 25 mm. across, and 25 mm. high; sepals 6, 

 roundish, concave, the inner portion green to yellow, rarely red-tinged; petals 

 numerous, small and thickish, stamenlike or scalelike, truncate to emarginate, 

 inserted with the numerous short stamens on the receptacle under the ovary, not 

 surpassing the disklike 5- to 25-rayed sessile stigma, mostly persistent and at length 

 recurved; anthers 3-7 mm. long, yellow, sometimes red-tinged; fruit ovoid, slightly 

 constricted below the entire to crenate stigmatic disk; stigmatic rays 5 to 25. 

 mostly ending 1-2 mm. from the disk margin; stigmatic disk sometimes red-tinged; 

 seeds numerous, broadly ovoid, 4-6 mm. long, 3.5-5 mm. wide. Nymphaea micro- 

 carpa MiH. & Standi., A^. ovata Mill. & Standi., N. puberula Mill. & Standi., 

 Nuphar advena of auth., N. advena (i tomentosa Nutt., A^. microcarpum (Mill. & 

 Standi.) Standi., A^. ovatum (Mill. & Standi.) Standi., N. puherulwn (Mill & 

 Standi.) Standi. 



In water or on mud in ponds, shallow lakes, streams and springs, in e. Okla. 

 (Choctaw, McCurtain Ottawa. Pushmataha and Sequoyah cos.) and in Tex. mostly 

 on the Edwards Plateau and in the e., Mar.-Oct.; throughout most of e. N.A.; 

 also n. Mex. and Cuba. 



Beal, the latest monographer of Nuphar. placed all Oklahoma and Texas 

 material in subsp. macrophyllum. We have found no reason to differ from his 

 conclusions. 



Two other subspecies should eventually be found in our region. These are 

 subsp. polysepalwn (Engelm.) E. O. Beal (A^. polysepalum Engelm.) (Fig. 444) 

 of extreme southern Colorado, northward and westward, characterized by having 

 9 to 12 sepals, anthers commonly red-tinged and seeds narrowly ovoid, and 

 subsp. ozarkamm-t (Mill. & Standi.) E. O. Beal of extreme western Arkansas and 

 Missouri, characterized by having the inner portion of its 6 sepals and its fruit 

 more or less red-tinged. 



3. Cabomba Aubl. 



About a half dozen species in the warmer parts of the Western Hemisphere. 

 1. Cabomba caroliniana Gray. Fanwort. Fig. 445. 



Delicate aquatic herbs rooting in mud; stems slender, branched, to 2 m. long 

 or more, with a thin gelatinous coating; submersed leaves opposite or whorled. 

 with petioles to 3 cm. long, rounded in outline, to 6 cm. wide, palmately dissected 

 into linear-filiform segments; floating leaves few, alternate, peltate, entire, linear- 

 elliptic, mostly slightly constricted at the middle, often bifid at one end, usually 

 pubescent beneath, to about 2 cm. long; flowers solitary on long slender axillary 

 peduncles, to 12 mm. long, white or cream-color, with yellow spots at base and 

 sometimes pink-tinged at tips; sepals 3; petals 3, oval, biauriculate above the 

 abbreviated claw; stamens 6, the short anthers extrorse; carpels 2 to 4, with small 

 terminal stigmas; fruit 3-seeded, indehiscent. 



906 



