528 CXXXIX. HYDROCHARIDACE^J. 



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

 Penn. (Muklenberg) 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-leaved Sagittaria. 



Lvs. 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. JUNCAGINE.E. 



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. Tf)is, three, yXw^tf, a corner; 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. *2j- Lvs. grass-like, all radical. 



1. T. MARITIMUM. (T. elatum. Nutt.} Sea Arrow-grass. 



Fruit 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, 6 12' 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 8" 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 petals oblong, acute, persistent ; sta. 6, with linear an- 

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

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

 at 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 G' 

 long, 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. HYDROCHABIDACEJE. HTDBOCHARADS. 



Plants aquatic, floating, with parallel-veined leaves. 

 Fls. dioocious or perfect, issuing from a spathe. 

 Perianth. Sepals 3^ herbaceous. Petals 3, colored. 

 Sta. definite or indefinite, epigynous. 



Ova. adherent to the perianth, single. Stigmas 3 6. Ovules indefinite. 

 Fr. dry or succulent, indehiscent, l or more celled. Seeds without albumen. 

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



