523 CXXXIX. HYDROCHARIDACEiE. 



ones subcordate ; scape simple, few-flowered; Imcer fed. elongated. — In water, 

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

 Flowers few, small, the upper sterile. Elliot. 



8. S. LANciFoi.iA. Willd. (S. falcata. Ph.) Lance-kavcd Sagittaria. 



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

 and somewhat perennial ; scape simple; «cA. 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. JUXCAGINEJ^. 



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. 

 G-r. TOis, three, yXuvij, 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, estrorse ; 

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

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



1. T. MARiTiMUM. (T. elatum. Nuit.) Sea Arrow-grass. 



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

 leaves.7— 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' 

 iong, 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 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. — % Lvs. caulijie, 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, HYDROCHARIDACE^E.— Hydrocharads. 



Plants aquatic, floating, with parailel-veined leaves. 

 Fls. dioecious or perfect, issuing frona a spathe. 

 Perianth.— SepaXs 3^ herbaceous. Petals 3, colored. 

 Sta. definite or indefinite, epigynous. 



Ova. adherent to the perianth, single. Stigmas 3—6. Ovule-i indefinite. 

 Fr. 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. 



