aLIsmace^. (water-plantain family.) 555 



^ or ^ the length of the sterile ; flaws of the petals purple-tinged ; filaments 

 not longer than the anthers ; and achenes almost orbicular, very broadly \vinged 

 and with a short straight beak. 



Var. pubescens, Kngelm. Upper part of petiole and scape and espe- 

 cially the orbicular-ovate obtuse bracts and sepals pubescent or woolly ; beak 

 of fruit horizontal. — N. J. and. Penn. to Ga. 



Var. (?) gracilis, Engelm. Lobes of the sagittate leaves very narrowly 

 linear (^ - 2" wide) ; achene narrowly cuueate-obovate (2" long), the beak long, 

 stout, and strongly recurved, the sides usually strongly 1 -3-crested. (S. eris- 

 tata, EiKjdm.'] ) — Mass. to western N. Y. ; Iowa. 



2. S. lancifolia, L. Scape 2-5° high, w^ith several of the lower whorls 

 fertile; leaves lanceolate or lance-oblong, rarely linear, all with a tapering 

 base, thick or coriaceous (6-18' long and on a long and stout petiole, never 

 sagittate), the nerves mostly arising from the very thick midrib ; bracts ovate, 

 acute or acuminate; pedicels slender, the fertile scarcely shorter than the 

 sterile ones; filaments pubescent; achenes falcate, winged on the back, 

 pointed with an incurved beak. — Swamps, Md. to Ky., Mo., and southward. 

 (W.Ind.) 



* * Filaments verij short, with enlarged mostli/ glandular base ; anthers orate or 

 short-oblong ; fruiting heads small ; oracts more or less connate ; leaves eery 

 rareli/ sagittate. 



3. S. heteroph^lla, Pursh. Scape weak (3' - 2° high), at length pro- 

 cumbent ; leaves lanceolate or lance-oval, entire, or with one or two narrow 

 basal sagittate appendages; bracts roundish, obtuse; flowers of the lowest 

 whorl fertile and almost sessile ; the sterile on long pedicels ; filaments glan- 

 dular-pubescent ; achenes narroidij obovate witJi a long erect beak. — X. Eng. to 

 Fla., west to Minn, and ]\Io. Varies as to foliage, the leaves being broad 

 (var. ELLfPTicA, Engelm.), or rigid and narrowly lanceolate w^ith stout peti- 

 oles (var. RiGiDA, Engelm.), or nearly linear (var. AxorsTirdLiA, Elngelm.) 



4. S. graniinea, Michx. Scape 3' -2° high; ph allodia flat, mostly 

 broadljj linear, acuminate; leaves ovate-lanceolate to linear, on long slender 

 petioles, sometimes reduced to the petiole merely ; bracts rather o])tuse ; whorls 

 of flowers often few% all staminate or the lower fertile ; pedicels slender, spread- 

 ing, nearly equal ; fllaments 15 - 20, glandular-pubescent ; achene small (4" long), 

 narrowly obovate, almost beakless, winged on the back, flat and scarceh/ costate 

 on the sides. — X. Eng. to Minn., south to the Gulf; very variable. 



5. S. tdres, Watson. Phgllodia terete, verg acutelij attenuate \\\)\\^Yi\, ^^ 

 12' long, very rarely bearing a narrow blade; scape i-H° high; bracts con- 

 nate at base; pedicels in 1-3 wliorls, all very slender and spreading, 1 or 2 

 fruiting, ^-V long; filaments 12, dilated, pubescent; achene obovate, 1" long, 

 with an erect beak, the margins and sides crenatelij several-crested. — In shallow 

 water, S. Xew Eng. to X. J. (Hyannis, Mass., Deane; Wading River, L. I., 

 Miller ; barrens of X. J., Torreg.) Phyllodia usually very strongly nodose. 



6. S. natans, Michx., var. lor ata, Chapm. Usually dAvarf ; leaves lin- 

 ear, strap-sliaped, obtuse or acutish, 1 -6' long, equalling or shorter than the 

 scape, very rarely with a narrow blade ; pedicels in 1 - 3 whorls, only 1 or 2 

 hn'itiug, stouter and recurved : bracts connate or spd.the-Yike; fl'lamenfs 6-8, 

 (jlabrous ; achene obovate, short-beaked, \" long, the margins and sides crenatelij 



