Sagittaria longiloba |
Sagittaria rigida |
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Gregg arrowhead, long lobed arrowhead, long-barb arrowhead, longlobe arrowhead |
Canadian arrowhead, sagittaire dressee, sessile-fruit arrowhead |
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Habit | Herbs, perennial, to 100 cm; rhizomes absent; stolons present; corms present. | Herbs, perennial, to 115 cm; rhizomes absent; stolons present; corms present. |
Leaves | emersed; petiole 5-ridged, ascending to erect, 24.5–60 cm; blade sagittate, 11.5–26.5 × 0.8–15 cm, basal lobes longer than remainder of blade. |
emersed or submersed; submersed leaves phyllodial, flattened, 30–70 cm, rarely widening into blade; emersed leaves phyllodial, flattened, or petiole triangular, 34–50 cm, blade linear to elliptic, rarely hastate to sagittate, 5–15 × 0.6–12 cm, basal lobes when present shorter than remainder of blade. |
Inflorescences | racemes, rarely panicles, of 5–17 whorls, emersed, 20–37 × 5–27 cm; peduncles 25–96 cm; bracts connate more than or equal to ¼ total length, lanceolate, 6.5–15 mm, delicate, not papillose; fruiting pedicels spreading, cylindric, 1.5–4.4 cm. |
racemes, of 2–8 whorls, emersed, 8–10 × 2–6 cm; peduncles 10–115 cm; bracts connate more than or equal to ¼ total length, ovate, 3–6 mm, delicate, not papillose; fruiting pedicels absent. |
Flowers | to 3 cm diam.; sepals recurved to spreading, not enclosing flower; filaments cylindric, shorter than anthers, glabrous; pistillate flowers pedicellate, without ring of sterile stamens. |
to 3 cm diam.; sepals recurved, not enclosing flower; filaments dilated, shorter than anthers, pubescent; pistillate sessile to subsessile, without ring of sterile stamens. |
Fruiting | heads 0.9–1.5 cm diam; achenes oblanceoloid, abaxially keeled, 1.2–2.5 × 0.8–1.6 mm, beaked; faces tuberculate, wings absent, glands 0–1; beak lateral, erect, 0.1–0.6 mm. |
heads 1–1.7 cm diam.; achenes obovoid to oblong, abaxially keeled, 2–3 × 1.3–1.6 mm, beaked; face not tuberculate, wings 1–2, ± entire, glands 1; beak lateral, recurved, 0.8–1.4 mm. |
2n | = 22. |
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Sagittaria longiloba |
Sagittaria rigida |
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Phenology | Flowering summer–fall. | Flowering summer (Jul–Sep). |
Habitat | Wet ditches, ephermeral pools, and margins of streams and lakes | Calcareous or brackish shallow water and shores of ponds, swamps, and rivers, occasionally in deep water |
Elevation | 0–300 m (0–1000 ft) | 0–1000 m (0–3300 ft) |
Distribution |
AZ; CA; KS; NE; OK; TX; Mexico; Central America (Nicaragua)
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AR; CA; CT; DC; DE; IA; ID; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; NE; NH; NJ; NY; OH; PA; RI; TN; VA; VT; WA; WI; WV; MB; ON; PE; QC; SK
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Alismataceae > Sagittaria | Alismataceae > Sagittaria |
Sibling taxa | ||
Synonyms | S. greggii | |
Name authority | Engelmann ex J. G. Smith: N. Amer. Sagittaria. 16, plate 11. (1894) | Pursh: Flora Americae Septentrionalis 2: 397. (1814) |
Web links |
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