Sagittaria rigida

Pursh

Flora Americae Septentrionalis 2: 397. 1814.

Common names: Sessile-fruited arrowhead Sagittaire dressee
WeedyIllustratedEndemic
Treatment appears in FNA Volume 22.

Herbs, perennial, to 115 cm; rhizomes absent; stolons present; corms present. Leaves 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, 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, not enclosing flower; filaments dilated, shorter than anthers, pubescent; pistillate sessile to subsessile, without ring of sterile stamens. Fruiting 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.


Phenology: Flowering summer (Jul–Sep).
Habitat: Calcareous or brackish shallow water and shores of ponds, swamps, and rivers, occasionally in deep water
Elevation: 0–1000 m

Distribution

V22 494-distribution-map.jpg

Man., Ont., Que., P.E.I., Sask., Ark., Calif., Conn., Del., D.C., Idaho, Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Mo., Nebr., N.H., N.J., N.Y., Ohio, Pa., R.I., Tenn., Vt., Va., Wash., W.Va., Wis.

Discussion

Selected References

None.

Lower Taxa

None.

"widening" is not a number.

... more about "Sagittaria rigida"
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
keeled;obovoid;oblong +
1.3mm;1.6mm +
papillose +  and smooth +
Obtuse (?) +  and Acute (?) +
Robert R. Haynes +  and C. Barre Hellquist +
attenuate;hastate or sagittate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
rarely hastate +  and sagittate +
0.6cm +  and 12cm +
not papillose +
equal to ¼ total length +  and more than +
Sessile-fruited arrowhead +  and Sagittaire dressee +
Man. +, Ont. +, Que. +, P.E.I. +, Sask. +, Ark. +, Calif. +, Conn. +, Del. +, D.C. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Nebr. +, N.H. +, N.J. +, N.Y. +, Ohio +, Pa. +, R.I. +, Tenn. +, Vt. +, Va. +, Wash. +, W.Va. +  and Wis. +
0–1000 m +
u--shaped +
not tuberculate +
1 cm10 mm <br />0.01 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
pistillate +, staminate +, sessile +  and pedicellate +
0 cm0 mm <br />0 m <br /> (3 cm30 mm <br />0.03 m <br />) +
hypogynous +
not +, keeled +  and compressed +
Calcareous or brackish shallow water and shores of ponds, swamps, and rivers, occasionally in deep water +
decumbent +  and floating +
8 cm80 mm <br />0.08 m <br /> (10 cm100 mm <br />0.1 m <br />) +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
petiolate +  and sessile +
flattened;flattened +
30 cm300 mm <br />0.3 m <br /> (70 cm700 mm <br />0.7 m <br />) +
decumbent +  and floating +
submersed +, floating +  and emersed +
ascending +  and recurved +
10 cm100 mm <br />0.1 m <br /> (115 cm1,150 mm <br />1.15 m <br />) +
deciduous +
triangular +
34 cm340 mm <br />0.34 m <br /> (50 cm500 mm <br />0.5 m <br />) +
Flowering summer (Jul–Sep). +
not radiating +  and arranged +
Flora Americae Septentrionalis +
decumbent +  and floating +
persistent +
sculptured +
herbaceous;leathery +
Weedy +, Illustrated +  and Endemic +
sessile +  and subsessile +
Lophotocarpus +
Sagittaria rigida +
Sagittaria +
species +
white;brown +
emersed +  and submersed +
glabrous +  and sparsely pubescent +
bracteolate +  and branching +