Sagittaria isoetiformis

J. G. Smith

Rep. (Annual) Missouri Bot. Gard. 6:115, plate 53. 1895.

IllustratedEndemic
Treatment appears in FNA Volume 22.

Herbs, perennial, to 65 cm; rhizomes absent; stolons present; corms present. Leaves emersed or submersed, phyllodial or rarely dilated apically, flattened, 4–40 cm × 0.05–0.4 (–0.5) cm. Inflorescences racemes, of 1–5 whorls, emersed, 2–20 × 1.5–12 cm; peduncles 7–59 cm; bracts connate more than or equal to ¼ total length, oblanceolate, 0.2–0.3 mm, delicate, not papillose; fruiting pedicels spreading, cylindric, 0.5–6 cm. Flowers to 1.3 cm diam.; sepals recurved to spreading, not enclosing flower; filaments dilated, shorter than anthers, minutely tomentose; pistillate pedicellate, without ring of sterile stamens. Fruiting heads 0.5–1 cm diam.; achenes obovoid, abaxially keeled, 2.2–2.8 × 1.5–2 mm, beaked; faces not tuberculate, wings 1–2, entire, glands 3–5; beak lateral, incurved-erect, 0.2 mm.


Phenology: Flowering summer–fall.
Habitat: Shores of sandy-bottomed lakes, se coastal plain
Elevation: 0–100 m

Distribution

V22 170-distribution-map.jpg

Ala., Fla., Ga., N.C., S.C.

Discussion

Sagittaria isoetiformis has often been misidentified as Sagittaria teres (E. O. Beal 1960b). The two species can be separated, however: S. teres has nearly terete phyllodia, whereas S. isoetiformis has flattened phyllodia (R. K. Godfrey and P. Adams 1964). A study of the genetics of the two species shows them to be genetically different, and the data indicate the two taxa actually should be considered at the specific level. The two species are capable of CAM photosynthesis, a process very uncommon in the genus and found among none of their supposedly closely related species (A. L. Edwards, pers. comm.).

Lower Taxa

None.
... more about "Sagittaria isoetiformis"
0.22 cm2.2 mm <br />0.0022 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
keeled;obovoid +
1.5mm;2mm +
papillose +  and smooth +
Obtuse (?) +  and Acute (?) +
Robert R. Haynes +  and C. Barre Hellquist +
J. G. Smith +
attenuate;hastate or sagittate +
incurved-erect +
0.2 cm2 mm <br />0.002 m <br /> (?) +
linear +  and obovate +
not papillose +
cylindric +  and oblanceolate +
equal to ¼ total length +  and more than +
Ala. +, Fla. +, Ga. +, N.C. +  and S.C. +
0–100 m +
u--shaped +
not tuberculate +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
pistillate +, staminate +, sessile +  and pedicellate +
0 cm0 mm <br />0 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
hypogynous +
not +, keeled +  and compressed +
3 (?) +  and 5 (?) +
Shores of sandy-bottomed lakes, se coastal plain +
decumbent +  and floating +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (12 cm120 mm <br />0.12 m <br />) +
petiolate +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
4cm;40cm +
flattened;dilated +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
decumbent +  and floating +
submersed +, floating +  and emersed +
ascending +  and recurved +
7 cm70 mm <br />0.07 m <br /> (59 cm590 mm <br />0.59 m <br />) +
deciduous +
terete +  and triangular +
Flowering summer–fall. +
not radiating +  and arranged +
Rep. (Annual) Missouri Bot. Gard. +
decumbent +  and floating +
godfrey1964a +
persistent +
recurved;spreading +
sculptured +
herbaceous;leathery +
Illustrated +  and Endemic +
Lophotocarpus +
Sagittaria isoetiformis +
Sagittaria +
species +
white;brown +
emersed +  and submersed +
glabrous +  and sparsely pubescent +
bracteolate +  and branching +