Sagittaria longiloba |
Sagittaria cristata |
|
---|---|---|
Gregg arrowhead, long lobed arrowhead, long-barb arrowhead, longlobe arrowhead |
crested arrowhead |
|
Habit | Herbs, perennial, to 100 cm; rhizomes absent; stolons present; corms present. | Herbs, annual or perennial, to 75 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, sessile, phyllodial, linear to lanceolate, flattened, 15–25(–40) × 1.5–4 cm, or petiole triangular, 15–50 cm, blade linear to elliptic-lanceolate, 4–10 × 0.3–2 cm. |
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 3–6 whorls, 1.5 × 4 cm; peduncle 20–60 cm; bracts connate greater than or equal to ¼ total length, ovate, 4–10 mm, nearly scarious, not papillose; fruiting pedicels spreading, cylindric, 0.8–3 cm. |
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 0.8 cm diam.; sepals recurved to spreading, not enclosing flower; filaments dilated, exceeding anthers in length, pubescent; pistillate pedicellate, 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 1.2–2 cm diam.; achenes cuneate-obovoid, abaxially keeled, 2.5–3 × 1.4–1.8 mm, beaked; faces not tuberculate, wings 1, ± entire, glands absent; beak ascending to horizontal, 0.4–0.7 mm. |
Sagittaria longiloba |
Sagittaria cristata |
|
Phenology | Flowering summer–fall. | Flowering summer (Jul–Aug). |
Habitat | Wet ditches, ephermeral pools, and margins of streams and lakes | Sandy margins and bottoms of lakes, ponds, and swamps |
Elevation | 0–300 m (0–1000 ft) | 100–1000 m (300–3300 ft) |
Distribution |
AZ; CA; KS; NE; OK; TX; Mexico; Central America (Nicaragua)
|
IA; IL; MI; MN; MO; NE; WI; ON
|
Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Alismataceae > Sagittaria | Alismataceae > Sagittaria |
Sibling taxa | ||
Synonyms | S. greggii | S. graminea var. cristata |
Name authority | Engelmann ex J. G. Smith: N. Amer. Sagittaria. 16, plate 11. (1894) | Engelmann: Proceedings of the Davenport Academy of Natural Sciences 4: 29. (1883) |
Web links |