58 FLORA. 



sterile ones; stamens numerous, the filaments longer than the anthers; achen 

 about 2 nun. long, quadrate obovate, somewhat broader above than below, winged 

 on both margins, it- beak exceedingly short. In shallow water, Neb. to Colo., south 

 to Tex. and Mex. 



7. Sagittaria ambigua J. G. Smith. Kansas Sagittaria. (I. F. f. 199.) 

 Monoecious; glabrous; scape erector ascending, 0.3-0.6 m. high. Leaves lanceolate, 

 entire, long-petioled, acute or acuminate at lxjth ends, seemingly pinnately veined, 

 really 5-7-nerved, 12-20 cm. long, equalling or shorter than the scape ; bracts 

 lanceolate, acuminate, I-I.6 cm. long, much shorter than the slender fruiting pediJ 

 eels, connate at the base, papillose; stamens 20-25; filaments glabrous, longer than 

 the anthers; achene alxmt 2 mm. long, oblong, curved, narrowly winged on lx>th 

 margins, its sides smooth and even, its beak short, oblique. In ponds, Kan. and 

 the Ind. Terr. 



8. Sagittaria lancifolia L. Lanced-leaved Sagittaria. (I. F. f. 200.) 

 Monoecious, glabrous ; scape rigid, erect, stout or rather slender, striate, branched 

 or simple, longer than the leaves. Leaves lanceolate or oblong-lanceolate, acute or 

 acuminate at both ends, firm, entire, the blades 5— 9-nerved, 0.2-0.4 m - l° n g> gradually 

 narrowed into the long petioles, apparently pinnately veined; flowers numerous, 

 1-2.5 cm - broad; bracts ovate or ovate-lanceolate, usually not united at the base, gla- 

 brous or nearly so, equalling or shorter than the fruiting pedicels; stamens numer- 

 ous; filaments cobwebby-pubescent, equalling or longer than the anthers; achene 

 narrowly obovate-cuneate, 2-3 mm. long, winged on both margins, its sides smooth, 

 its beak tapering, oblique. In swamps and shallow water, Del. to Fla. and Tex., 

 near the coast. Widely distributed in tropical America. 



9. Sagittaria rigida Pursh. Sessile-fruited Arrow-head. (I. F. f. 201.) 

 Monoecious, glabrous; scape simple, weak, curving, ascending or decumbent, 

 shorter than the leaves. Leaves very variable, linear, lanceolate, elliptic or broadly 

 ovate, acute or obtuse at the apex, entire or with 1 or 2 short or slender basal lobes; 

 bracts ovate, obtuse, 4-8 mm. long, united at the base or sometimes distinct; heads of 

 fruit sessile or very nearly so; pedicels of the sterile flowers 1-2.5 cm - l° n g; filaments 

 dilated, mostly longer than the anthers, pubescent; achene narrowly obovate, 3-4 

 mm. long, winged on both margins, crested above, tipped with a stout nearly erect, 

 beak of about one-fourth its length. In swamps and shallow water, Quebec to Minn., 

 N. J., Tenn., Mo. and Neb. July-Sept. (S. heterophylla Pursh.) 



10. Sagittaria teres S. Wats. Slender Sagittaria. (I. F. f. 202 

 Monoecious; glabrous; scape slender, erect, simple, 1.5-4.5 dm. long, bearing only 

 1-3 verticils of flowers. Leaves usually reduced to elongated terete nodose 

 phyllodes or some of them short and bract-like, one or two of the longer ones occa- 

 sionally bearing a linear blade; bracts ovate, obtuse, about 3 mm. long, mud 

 shorter than the filiform fruiting pedicels, which are longer than the sterile ones! 

 flowers 12-16 mm. broad; stamens about 12, their dilated filaments pubescent 

 shorter than the anthers; achene broadly obovate, 2 mm. long, the ventral margh 

 winged, the dorsal 7- 11 -crested, the sides bearing several crenate crests, the beal 

 short, erect. In ponds, Mass. to S. Car. Aug.-Sept. 



11. Sagittaria Eatoni J. G. Smith. Eaton's Sagittaria. Monoecioul 

 0.1-0.2 m. nigh, glabrous; scape simple, slender, ascending, weak, bearing 1. 2 

 or rarely 3 verticils of flowers. Leaves mostly bladeless phyllodes, rarely witl 

 linear-lanceolate, acute or acuminate blades 1.8-3 cm l° n g< 2_ 4 mm - wide; th 

 phyllodes flat, nodeless ; lowest verticil with two fertile flowers, and one stam 

 mate; fertile pedicels 4-8 mm. long, shorter than the sterile ones, very slender 

 sepals ovate-lanceolate, obtuse, 4 mm. long; petals white, with a rose-colored spc 

 at the base, obovate-cuneifbrm, emarginate; stamens 12: matureachenes not known 

 pistils very minute, 80-100. Ripple-swept, sandy shores, between high and loi 

 tide, above the influence of salt water. Newburyport, Mass. 



12 Sagittaria cristata Engelm. Crested Sagittaria. (I. F. f. 203 

 Monoecious; scape slender, erect, 0.30.8 m. high, simple, bearing 4 or 5 vertici 

 of flowers at or above the surface of the water. Leaves long-petioled, sponge an 

 rigid, reduced to slender phyllodes or bearing linear-lanceolate or elliptic hade 

 5-10 cm. long, and 6 25 mm. wide; bracts acute. 4-S mm. long, much shorter tha 

 the slender fertile pedicels; flower- 1.6 2 cm. broad; stamens about 24; til amen 

 dilated, pubescent, at least at the middle, longer than the anthers; achene obliquel 





