4. Sagittaria Brevirostra Alack. & Bush. Short-Beaked Arrow-Leaf

Fig. 234

Sagittaria variabilis diversifolia Engelm. in A. Gray,

Man. Ed. 5, 493. 1867. Sagittaria brevirosta Mack. & Bush, Rep. Mo. Bot.

Gard. 16: 102. 1905.

Monoecious, glabrous, scape erect, 1 1/3°-2 2/3° tall, simple or branched. Leaves ovate to lanceolate, sagittate or hastate, 5-17' long, acute at the apex, the basal lobes lanceolate to linear-lanceolate, about 1/2 the length of the blade; scape usually taller than the leaves, 4-6-angled; bracts lanceolate to linear-lanceolate, attenuate; flowers 1' broad or less; filaments glabrous, slender; achene suborbicular to cuneate-obovate, 1 1/4"- 1 1/2" long, broadly winged on both margins, and ridged on the sides, the short erect beak less than 1/2 as long as the body.

In bogs and shallow streams. New Jersey and Pennsylvania to Florida and Tennessee. Aug.-Oct.

5. Sagittaria Latifolia Willd. Broad-Leaved Arrowhead

Fig. 235

Sagittaria latifolia Willd. Sp. PI. 4: 409. 1806.

Sagittaria variabilis Engelm. in A. Gray, Man. 461. 1848.

Monoecious or sometimes dioecious, glabrous or nearly •so, scape stout or slender, 4'-4° tall, simple or branched. Leaves exceeding variable in form and size, sometimes linear-lanceolate and acuminate at the apex, sometimes wider than long and obtuse; basal lobes from 1/4 to 1/2 as long as the blade; bracts acute, acuminate or obtuse, the upper ones sometimes united; flowers 1'-1 1/2' wide; filaments slender, glabrous; achene 1"-2" long, broadly winged on both margins, its sides even or 1-ribbed, the beak about one-third its length, horizontal or nearly so.

In shallow water, throughout North America, except the extreme north, extending to Mexico. Variable. July-Sept.

6. Sagittaria Pubescens Muhl. Hairy Arrow-Leaf

Fig. 236

Sagittaria pubescens Muhl. Cat. 86. 1813. Sagittaria sagittifolia pubescens Torr. Comp. 356.

1826. Sagittaria variabilis pubescens Engelm. in A. Gray,

Man. Ed. 5, 493. 1867. Sagittaria latifolia pubescens J. G. Smith, Mem.

Torrey Club 5: 25. 1894.

Monoecious or rarely dioecious, pubescent, scape erect, 1°-2° tall, simple or rarely branched. Leaves ovate, deltoid or deltoid-lanceolate, mostly acute, rarely acuminate at the apex; basal lobes 1/2 the length of the blades or nearly so; bracts obtuse, sometimes broadly rounded; flowers 1/2'-l' wide; filaments very slender, glabrous; achene 1 1/2"-2" long, winged on both margins, its sides prominently winged, the beak about 1/2 its length.

In bogs and shallow water, Nova Scotia to Wisconsin, Missouri and Kansas. July-Sept.

7. Sagittaria Longiloba Engelm. Long-Lobed Arrow-Head

Fig. 237

Sagittaria longiloba Engelm. in Torr. Bot. Mex. Bound. Surv. 212. 1859.

Monoecious, glabrous, scape slender, simple or rarely branched, l°-2° tall. Leaves long-petioled, the apex acute, the basal lobes linear-lanceolate, acuminate, about three-fourths the length of the blade; bracts lanceolate, acuminate, 3"-4" long, much shorter than the very slender fertile pedicels which are longer than the sterile ones; stamens numerous, the filaments longer than the anthers; achene about 1" long, quadrate-obovate, somewhat broader above than below, winged on both margins, its beak exceedingly short.

In shallow water, Nebraska to Colorado, south to Texas and Mexico.