Comments
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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.
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Description
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Herbs, perennial, to 100 cm; rhizomes coarse; stolons absent; corms absent. Leaves 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. Inflorescences 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. Flowers 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. Fruiting 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.
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Comprehensive Description
provided by North American Flora
Sagittaria graminea Michx. Fl. Bor. Am. 2 : 190. 18Q3
Plants emersed or submerged, 1-6 dm. tall ; leaves represented by flat, linear, oblong, or linear-lanceolate phyllodia 5-30 cm. long and usually also by blade-tipped petioles, the blades linear, lanceolate, or elliptic, 3-15 cm. long, rarely with divergent basal lobes and hastate ; scapes usually erect, simple, shorter than the leaves or overtopping them ; whorls of the inflorescence few and remote or some times numerous and rather approximate; pedicels variable, but those of staminate and pistillate flowers often about equal in length ; bracts ovate, 3-7 mm. long, acute, united to about the middle ; sepals ovate or oblongovate, becoming 4-6 mm. long ; corolla commonly 1-2 cm. broad ; filaments dilated, pubescent ; anthers about as long as the filaments ; fruit-heads less than 1 cm. in diameter ; achenes cuneate, 1.5 mm. long, winged, with one facial wing or crest, the beak short, lateral, spreading.
Type locality : Canada.
Distribution : Newfoundland to Saskatchewan, Florida, and Texas.
- bibliographic citation
- Percy Wilson, Per Axel Rydberg, Norman Taylor, Nathaniel Lord Britton, John Kunkel Small, George Valentine Nash. 1909. PANDANALES-POALES; TYPHACEAE, SPARGANACEAE, ELODEACEAE, HYDROCHARITACEAE, ZANNICHELLIACEAE, ZOSTERACEAE, CYMODOCEACEAE, NAIADACEAE, LILAEACEAE, SCHEUCHZERIACEAE, ALISMACEAE, BUTOMACEAE, POACEAE (pars). North American flora. vol 17(1). New York Botanical Garden, New York, NY
Sagittaria graminea: Brief Summary
provided by wikipedia EN
Sagittaria graminea, the grassy arrowhead or grass-leaved arrowhead, is an aquatic plant species native to eastern North America.
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