2 S. heterophylla Ph. Lvs. smooth, linear-lanceolate, rarely some of them elliptical and sagittate; scape simple, weak; bracts roundish, obtuse; upper fls. sterile, on long pedicels, the lowest whorl fertile, almost sessile; fil. very short; ach. narrowly obovate. long-beaked. - Muddy shores, common S. and W. Leaves almost as variable as in No. 1, but the other marks are very distinctive. Stalks If to several, according to the depth of water. Blades 5 to 10' in length. Fls. large, 12 to 16" diam., white. July.

β RIGIDA. Plant rather rigid in habit, erect; lvs. narrowly lanceolate; acute at apex, acute or obtusish at brase. - Lake shores. (S. rigida Ph.)

γ. Angustifolia. Lvs. nearly linear, delicate, often floating as well as the weak, elongated scape.

3 S. lancifolia L., Mx. Lvs. lance-oblong, acutish, feather-veined, long-tapering at base to a very long petiole; scape tall, branched; fls. in 3s, all long-pedicellate; bracts broad-ovate, short-pointed; fil. hairy, longer than the anthers; ach. obovate-falcate. - River swamps, Conn. ? Va. to Fla. and La. (Hale). Stalks stout 3f or more, according to the depth of water. Leaves thick and leathery, 8 to 14', the veins diverging from the midvein, crossed by the veiulets. Fls. white, showy. (S. falcata Ph.)

β. ? Very slender, erect, with nearly linear leaves; bracts and sep. scabrous. - La. to Tex. 4 S. graminea Mx. Lvs. ovate-lanceolate, varying to linear, rarely sagittate; scape erect, slender, longer than the leaves; lower whorls fertile; all the pedicels slender, equal; filaments shore as the anthers; ach. beakless.-ln shallow water or mud common. Lvs. commonly very narrow, attenuate-pointed, 4 to 12' or more. Scape 5 to 20' in height, the pedicels 1' or less. Flowers small, 8 or 9" diam., white; stam. few. The forms with lanecovate leaves constitute a well marked variety. (S. simplex, Ed. 2.)

5 S. pusilla Nutt. Petioles (leaves?) short, linear, obtuse, summits only folia-ceous; scape simple, shorter than the leaves; fls. few, fertile one solitary, deflexed; stam, mostly 7. - A diminutive species on muddy banks, N. Y. to Ga. Leaves rarely subulate, an inch or two long, less than a line wide. Scape 2 - 4' high. Flowers 4 - '7, the lowest one only fertile. Aug.

6 S. natans Mx. Lvs. floating, oval-lanceolate, obtuse, 3-veined, tapering to the base, lower 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).

7 S. uliginosa Engelm. Lvs. oval-sagittate, rounded-obtuse, lobes triangular; scapes several, as tall (6 - 10) as the lvs; fls. in pairs, the lower pair (fertile) on thick pedicels, longer than the upper; bracts obtuse; ach. broad-obovate, long-pointed. - St. Louis, perhaps not within our limits.

4. TRIGLO'CHIN, L. Arrow Grass. (Gr.Order CXXXV Alismaceae Water Plantains Continued 1937 three, Order CXXXV Alismaceae Water Plantains Continued 1938 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 l-ovuled; stigmas adnata; fruit clavate, composed of 3 - 6 united, indehiscent, 1-seeded carpels. - Order CXXXV Alismaceae Water Plantains Continued 1939 Lvs. grass-like, all radical.

1 T. maritimum L. 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, N. Y.,Wis. Lvs. linear, semi-cylindric, smooth, thick, 6 - 12' long, less than a line wide. Scape obtusely angled, simple, 9 - 18' long, 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. (T. elatum. Nutt.)

2 T. palustre L. Fruit nearly linear, of 3 united carpels; scape scarcely longe than the leaves. - In marshes, Salina, N. Y. N. to Arc. Am. Leaves very nu merous, 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 blender fruit is attenuated at base, obtuse at apex, grooved and margined, consisting of 3 very slender carpels. July.

5. SCHEUCHZE'RIA, L. (To the Scheuchzers, two brothers, distinguished botanists.) Sepals and petals oblong, acute, persistent; sta. 6, with linear anthers; stigmas sessile, lateral; ovaries 1 - 2-ovuled; capsules inflated, compressed, 2'-.alved, 1 - 2-seeded. -Order CXXXV Alismaceae Water Plantains Continued 1940 Lvs. cauline, linear, sheathing at base.

S. palustris L. A rush-like plant, la swamps, Vt., Penn., to Ill. Root-stock horizontal, fleshy. Stem about a foot high, simple, angular. Leaves semi-cylindric, 4 - 6' 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 targe, exserted, crect. June, July.