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Alismataceae

Sagittaria platyphylla (Engelm.) J.G.Sm.

Kingdom: Plantae Rank: Species Parent: Sagittaria Status: Invalid Reason: unverified

Common Names:

  • DELTA ARROWHEAD - English, United States of America

Morphological Description

Diagnosis: Leaf blades lanceolate to elliptic or ovate, 8–20 cm long, 2–8 cm wide, rarely with a lateral projection(s) from the base, but never truly sagittate; bracts of inflorescence smooth, basally connate, 3–8 mm long; stalks (pedicels) of fruiting “heads” spreading to recurved; sepals 4–6 mm long, usually reflexed from fruiting aggregate; filaments dilated, as long as or longer than anthers, pubescent; achenes 1.2–2 mm long; beak of achene inserted laterally, 0.3–0.6 mm long, horizontal to ascending, subulate.

Other

Notes: Swamps, marshes, ponds, or other wet areas; Pineywoods and Gulf Prairies and Marshes w to Rolling Plains and Edwards Plateau; e U.S. from VA s to FL w to KS and TX. Apr–Oct. [S. graminea Michx. var. platyphylla Engelm.] This is one of the most common Sagittaria species in East TX. While not problematic in its native North America, this species has recently (Sage et al. 2000) been discovered as an introduced weed in w Australia, where it has been described as an aquatic weed threat and has been designated a “Declared Plant” of the highest priority for control. (platyphylla: broad-leaved)