Short Beak Arrowhead

Herbs, perennial, to 70 cm; rhizomes absent; stolons present; corms present. Leaves emersed; petiole terete-ridged, to 39 cm; blades sagittate, 5--20 ´ 2--8 cm, basal lobes equal to or less than remainder of blade. Inflorescences racemes or panicles, of 5--12 whorls, emersed, 25--30 ´ 6--15 cm; peduncles to 45 cm; bracts distinct or if connate, then less than ¼ total length, long-acuminate, 10--40 mm, firm, not papillose; fruiting pedicels spreading to ascending, cylindric, 1--2.5 cm. Flowers to 3.5 cm diam.; sepals recurved to spreading, not enclosing flower; filaments cylindric, longer than anthers, glabrous; pistillate pedicellate, without ring of sterile stamens. Fruiting heads (1.2--)1.5--2.5 cm diam.; achenes cuneate-obovoid, without abaxial keel, 2.1--3.1 ´ 1.4--2.2 mm, beaked; faces ??, wings 0--2, ± entire, glands absent; beak lateral, ascending apically, 0.4--1.7 mm. missing datum is whether faces are tuberculate or not; if datum is not easily available, change wording to near-original "faces with 0--2 wings."

Sask.; Ala., Ark., Calif., Colo., Ill., Ind., Iowa, Kans., Ky., La., Mich., Minn., Miss., Mo., Nebr., Ohio, Okla., S.Dak., Tex., Va., Wis.

Flowering summer (Jul--Sep).

Slightly basic to slightly acidic to alkaline waters of ponds, lakes, and swamps; 100--—1800m.

Sagittaria engelmanniana J. G. Smith subsp. brevirostra (Mackenzie & Bush) Bogin

Sagittaria brevirostra Mackenzie & Bush, Rep. Mo. Bot
Gard. 16 : 102. 1905.
Sagittaria variabilis diversifolia Engelm. in A. Gray, Man. ed. 5. 493. 1867.
Plants mostly emersed, 4-8 dm. tall ; leaf-blades sagittate, 25^40 cm. long, the terminal lobe lanceolate or linear-lanceolate, acuminate, the basal lobes narrowly lanceolate or almost Pari 1, 1909] ALJSMACEAE 59
linear, acuminate, as long as the terminal lobe or somewhat longer ; scapes usually taller than the leaves, 4-6-angled, simple or branched ; whorls of the inflorescence several or numerous ; bracts lanceolate or linear-lanceolate, mostly 3-5 cm. long, attenuate ; pedicels straight, those of the pistillate flowers 1-2 cm. long, those of the staminate flowers longer ; sepals ovate, becoming 10-12 mm. long; corolla about 2.5 cm. broad; filaments not dilated, glabrous ; fruit-heads 2-3 cm. in diameter ; achenes cuneate-obovate to suborbicular, about 2.5 mm. long, broadly winged, the minute beak erect over the ventral wing.
Type locality : Western Missouri.
Distribution : Nova Scotia to Wisconsin, Missouri, and Kansas.

Sagittaria brevirostra, common name Midwestern arrowhead or shortbeak arrowhead, is an aquatic plant species native to North America. It is common in wet places in an area stretching from Michigan and Ohio south to Alabama and west to North Dakota, Colorado and northern New Mexico, plus isolated populations in Maryland, New Brunswick, Virginia, Saskatchewan and California (Marin County).

Sagittaria brevirostra grows in shallow water along the edges of ponds, swamps and waterways. It is a perennial herb up to 70 cm tall, with arrow-shaped leaves and white flowers.