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Northern Prairie Wildlife Research Center

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Aquatic and Wetland Vascular Plants of the Northern Great Plains

51. Alismataceae, the Water Plantain Family

3. Sagittaria L. -- Arrowhead, duck potato

4. Sagittaria graminea Michx.

Emergent to emersed perennial or perhaps usually annual in our range, producing rhizomes well after flowering in first year plants. Leaves variable depending on degree of submergence and age of plant, submersed plants with the earliest leaves comprising a rosette of phyllodes, these tapelike, to 1 cm wide, acute-tipped, often absent by flowering time; emergent leaves or leaves of emersed plants with blades elliptic to linear-oblong, never sagittate, 3-20 cm long, 0.5-3 cm wide, acute or attenuate to the blunt tip. Inflorescences 1-few, shorter than to exceeding the leaves, simple, with 2-6(9) whorls of flowers; bracts triangular-ovate, connate in the lower 1/2, 2-8 mm long; pedicels slender to filiform, 1-4 cm long, ascending to spreading. Flowers usually male above and female below, rarely all of one sex; sepals ovate, 3-5 mm long, reflexed in fruit; petals white, about equaling to over 2X the sepal length; filaments equaling to longer than the anther, puberulent. Fruiting heads globose or subglobose, 5-12 mm across; the receptacle often conspicuously spongy-thickened; achenes 1-2 mm long, prominently winged, the dorsal wing rounded over the top of the achene and continuous with the ventral wing; beak minute and projecting laterally or absent. Jun--Sep. Mud or shallow water of marshes, ponds and ditches; uncommon in NE and rarely n into SD, probably as a temporary introduction by waterfowl; (Labr. and Newf. to SD, s to FL and TX; also Cuba).
GIF- Distribution Map

Map key

Previous Section -- Sagittaria cuneata Sheld.
Return to Family -- Alismataceae - The Water Plantain Family
Next Section -- Sagittaria latifolia Willd.

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