Sagittaria engelmanniana

J. G. Smith

Memoirs of the Torrey Botanical Club 5: 25. 1894.

Common names: Acid-water arrowhead
Endemic
Treatment appears in FNA Volume 22.

Herbs, perennial, to 70 cm; rhizomes absent; stolons present; corms present. Leaves emersed; petiole triangular, 10–40 cm; blade sagittate, 4.5–10 × 0.2–2 cm, basal lobes equal to remainder of blade. Inflorescences racemes, of 2–4 whorls, emersed, 5–14 × 2–4 cm; peduncles 20–38 cm; bracts distinct or if connate, then less than ¼ total length, lanceolate, 5–25 mm, not papillose; fruiting pedicels spreading, cylindric, 1.5–3.5 cm. Flowers to 30 mm diam.; sepals recurved to spreading, not enclosing flower or fruiting head; filaments linear, longer than to equal length of anther, glabrous; pistillate pedicellate, without ring of sterile stamens. Fruiting heads 1–1.8 cm diam.; achenes cuneate to obovoid, without abaxial keel, 2.4–4 × 1.5–3.8 mm, beaked; faces not tuberculate, wings 1–3, entire, glands 1–2; beak lateral, obliquely ascending, (0.7–) 1–2.1 mm. 2n = 22.


Phenology: Flowering late spring–summer (Jun–Sep).
Habitat: Acid waters of ponds, lakes, bogs, and streams
Elevation: 0–1100 m

Distribution

Ont., Ala., Conn., Del., Fla., Ga., Md., Mass., Miss., N.J., N.Y., N.C., Pa., R.I., S.C., Va.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Sagittaria engelmanniana"
0.24 cm2.4 mm <br />0.0024 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
cuneate;obovoid +
1.5mm;3.8mm +
papillose +  and smooth +
Obtuse (?) +  and Acute (?) +
Robert R. Haynes +  and C. Barre Hellquist +
J. G. Smith +
attenuate;hastate or sagittate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
4.5 cm45 mm <br />0.045 m <br /> (10 cm100 mm <br />0.1 m <br />) +
sagittate +
0.2cm +  and 2cm +
less than ¼ total length +
connate +  and distinct +
not papillose +
cylindric +  and lanceolate +
Acid-water arrowhead +
Ont. +, Ala. +, Conn. +, Del. +, Fla. +, Ga. +, Md. +, Mass. +, Miss. +, N.J. +, N.Y. +, N.C. +, Pa. +, R.I. +, S.C. +  and Va. +
0–1100 m +
u--shaped +
not tuberculate +
1 cm10 mm <br />0.01 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
linear +  and dilated +
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 +
1 (?) +  and 2 (?) +
Acid waters of ponds, lakes, bogs, and streams +
decumbent +  and floating +
5 cm50 mm <br />0.05 m <br /> (14 cm140 mm <br />0.14 m <br />) +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
petiolate +  and sessile +
decumbent +  and floating +
submersed +, floating +  and emersed +
ascending +  and recurved +
20 cm200 mm <br />0.2 m <br /> (38 cm380 mm <br />0.38 m <br />) +
deciduous +
triangular +
10 cm100 mm <br />0.1 m <br /> (40 cm400 mm <br />0.4 m <br />) +
Flowering late spring–summer (Jun–Sep). +
not radiating +  and arranged +
Memoirs of the Torrey Botanical Club +
decumbent +  and floating +
persistent +
recurved;spreading +
sculptured +
herbaceous;leathery +
Lophotocarpus +
Sagittaria engelmanniana +
Sagittaria +
species +
white;brown +
emersed +  and submersed +
glabrous +  and sparsely pubescent +
bracteolate +  and branching +