Sagittaria graminea
Sagittaria graminea subsp. weatherbiana
grass-leaf arrowhead, grassy arrowhead, sagittaire a feuilles de graminees
Weatherby's arrowhead
submersed or emersed; submersed leaves phyllodial, angled abaxially, flattened adaxially, 6.4–35 × 0.5–4 cm; emersed with petiole triangular, 6.5–17 cm, blade linear to linear-oblanceolate, 2.5–17.4 × 0.2–4 cm.
1–2.5 cm wide.
racemes or panicles, of 1–12 whorls, emersed, 2.5–21 × 1–8 cm;
peduncles 6.5–29.7 cm;
bracts connate more than to equal to ¼ total length, broadly subulate to lanceolate, 20–50 mm, coarse, not papillose; fruiting pedicels spreading, cylindric, 0.5–5 cm.
racemes;
pistillate pedicels 2.1–5 cm.
to 2.3 cm diam.;
sepals recurved to spreading, not enclosing flower;
filaments dilated, shorter than anthers, pubescent;
pistillate flowers pedicellate, without ring of sterile stamens.
heads 0.6–1.5 cm diam.;
achenes oblanceoloid, without abaxial keel, 1.5–2.8 × 1.1–1.5 mm, beaked;
faces not tuberculate, abaxial wings 0–1, ± entire, glands 1–2;
beak lateral, erect, 0.2 mm.
= 22.
Sagittaria graminea
Sagittaria graminea subsp. weatherbiana
Seven varieties of Sagittaria graminea have been recognized, i.e., var. graminea, var. platyphylla Engelmann, var. teres (S. Watson) Bogin, var. weatherbiana Fernald, var. cristata (Engelmann) Bogin, var. chapmanii J. G. Smith, and var. macrocarpa (J. G. Smith) Bogin (C. Bogin 1955). We accept only one infraspecific rank, i.e., subspecies. Consequently, we have made the appropriate combinations. We accept all of the taxa accepted by Bogin at the varietal level. At specific level we accept Bogin’s var. platyphylla, var. teres, and var. cristata and at subspecific level his var. graminea, var. chapmanii, and var. weatherbiana.
Sagittaria graminea var. macrocarpa actually is synonymous with var. graminea (E. O. Beal 1960b). We therefore are following Beal in recognizing var. macrocarpa sensu Bogin as S. fasciculata. We also accept var. platyphylla, var. teres, and var. cristata at the specific level, leaving only three subspecies. These subspecies can be separated by the branching of the inflorescence and the length of pistillate pedicels.
Subspecies 3 (3 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Inflorescences panicles. | subsp. chapmanii |
1. Inflorescences racemes. | → 2 |
2. Pistillate pedicels 0.5–3 cm; phyllodia less than 1 cm wide | subsp. graminea |
2. Pistillate pedicels 2.1–5 cm; phyllodia more than 1 cm wide | subsp. weatherbiana |
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