528 CXXXIX. HYDROCHARIDACEiE. 



ones subcordate ; scape simple, few-flowered ; lower 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. Ph.) 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. JUNCAGINEiE. 



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

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

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

 Flowers in spikes or racemes. 



3. TRIGLOCHIN. 



Gr. rpii, three, yXw^'^' 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. elatum. Nutt.) Sea Arrow-grass. 



IVuit 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—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 Arroio-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. cauli?ie, linear, sheathing 

 at base. 



S. PALUSTRIS. 



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

 fleshv. Stem about a foot high, simple, angular. Leaves semicylindric, 4-0' 

 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. HYDROCHAEIDACE^.— Hydrocharads. 



Plants aquatic, floating, with parallel-veined leaves. 

 Fls. dicecious or perfect, issuing from a spathe. 

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

 Sta. definite or indehnite, epigynous. , . 



Oya. adherentto the perianth, single. Stigmas 3— 6. 0»?<?« mdehnite. 

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

 Genera l?, species 20, native of Europe, X. America, and the East Indies. Of no important uae. 



