528 CXXXIX. HYDROCHARIDACEiE. 



ones subcordate ; scape simple, few-flowered ; loiccr ped. elongated. — In water, 

 Penn. (^Muhlenberg) to Car. Scape mostly erect, 3 — 6' long. Leaves 1 — 2' long. 

 Flowers few, small, the upper sterile. Elliot. 



8. S. LANCiFOLiA. Willd. (S. falcata. PA.) Lance-leavcd Sagittaria. 



Lis. broad-lanceolate or ovate, acute at each end, glabrous, coriaceous, 

 and somewhat perennial ; scape simple ; ach. compressed, subfalcate.— This re- 

 markable species (but unknown to me) has been found along the shores of the 

 Connecticut river, Mass. and Ct. Stem 2 — 3f high. 



Suborder. JUXCAGIXE^. 



Sepals and petals both herbaceous (green), or 0. Stamens 6. Ovaries 

 3 or 6, coherent, ovules 1 — 2 in each carpel. Seeds erect, with 

 the embryo straight. Herbaceous, bog plants. Leaves ensiform. 

 Flowers in spikes or racemes. 



3. TRIGLOCHIN. 



Gr. Tpis, three, yXw;^tj, a comer; on account of the 3-angled fruit. 



Sepals and petals concave, deciduous, the former inserted a little 

 below the latter ; stamens 6, very short ; anthers large, extrorse ; 

 ovaries 1-ovuled; stigmas adnate : fruit clavate, composed of 3 — 6 

 united, indehiscent, 1 -seeded carpels. — % Lvs. grass-like, all radical. 



1. T. MARiTiMUM. (T. elatura. Nutt.) Sea Arrow-grass. 



Frvit ovate-oblong, grooved, of 6 united carpels ; scape longer than the 

 leaves. — A rush-like plant in salt marshes and ditches on the sea-coast, and at 

 Salina, N. Y., also lake shores, Wise. ! Leaves linear, semicylindric, smooth, 

 thick, G — 1*2' long, less than a line wide. Scape obtusely angled, simple, 9 — 18' 

 Jong, bearing a long raceme .of 30 — 40 green flowers on pedicels 1 — 2" long. 

 Fruit .separating into 6 linear carpels, each containing a linear seed. The 

 plant has a sweetish taste, and cattle are fond of it. July. 



2. T. PALUSTRE. Marsh Arrow-grass. 



Fruit nearly linear, of 3 united carpels ; scape scarcely longer than the leaves. 

 —In marshes, Salina, N. Y. ! N. to Arc. Am. Leaves very numerous, fleshy, 

 smooth, very narrow. Scape 6 — 12' high, ending in a raceme with rather remote, 

 very small, green flowers on pedicels 2 — 3" long. The slender fruit is attenu- 

 ated at base, obtuse at apex, grooved and margined, consisting of 3 very slen- 

 der carpels. July. 



4. SCHEUCHZERIA. 



In honor of the Scheuchzers, two brothers, distinguished botanists. 



Sepals and petais oblong, acute, persistent ; sta. 6, with linear an- 

 thers : stigmas sessile, lateral ; ovaries 1 — 2-ovuled ; capsules inflated, 

 compressed, 2-valved, 1 — 2-seeded. — % Lvs. cauline, linear^ sheathing 

 (it base. 



S. PALUSTRIS. 



A rush-like plant, in swamps, Vt. ! to Penn. Rare. Root-stock horizontal, 

 fleshy. Stem about a foot high, simple, angular. Leaves semicylindric, 4 — 6' 

 l(tng, in the barren shoots much longer, sheathing at base. Raceme terminal, 

 5 — 8-flowered. Flowers yellowish-green, on short pedicels, each axillary' to a 

 bract. Stamens large, exserted, erect. July. 



Order CXXXIX. HYDROCHARIDACE^.— Hydrocharads. 



Plants aquatic, floatinf?, with parallel-veined leaves. 

 Fitt. di<fcious or perfect, issuing from a spathe. 

 Periantfi—ScpaU 3^ herbaceous. Petals i, colored. 

 Sta. dclitiite or uidehnile, epi^jyuous. 



Oca. adherent to the perianth, sinple. Stisrmai 3—6. Ovules indefinite. 

 by. dry or succulent, indehiscent, 1 or more celled. Seeds without albumen. 

 Genera 12, species 20, native of Europe, N. America, and the East Indies. Of no important use. 



