Flora of North America species comparison

limp, unkeeled, flat to plano-convex, 0.2–0.8(–2.5) m × 2–5(–10) mm.

rachis unbranched, flexuous, its fertile part usually erect at water surface;

bracts ascending, lower bracts inflated near base; pistillate heads 2–5, at least some supra-axillary, not contiguous, sessile or most proximal peduncled (often prominently so in deeper water), 1–3 cm diam. in fruit; staminate heads (1–)2–4, contiguous and appearing as one elongate head, not contiguous with distalmost pistillate head.

tepals without subapical dark spot, erose-tipped, stigma 1, lance-ovate.

reddish to brownish, dull, short-stipitate, ellipsoid to fusiform, not faceted, body constricted at equator, 3–7 mm, tapering to beak;

beak straight, 1.5–2 mm;

tepals attached at base, reaching about to equator.

1.

= 30.