叶无柄或具短叶柄，对5毫米的叶柄；不青春期的花被筒在里面。
Leaves sessile or shortly petiolate, petiole to 5 mm; perianth tube not pubescent inside.
一种美国水生植物，叶肾形或圆心形，佛焰苞具有短的柄或无柄；通常扎根在池塘和水沟的底部淤泥中。
American plant with roundish heart-shaped or kidney-shaped leaves; usually rooted in muddy bottoms of ponds and ditches.
叶互生，倒披针形，钝，无柄，半圆柱形；花序简单，直立，几乎无花序叶，5–12（-15）厘米高。
Leaves alternate, oblanceolate, obtuse, sessile, semiterete; flowering branches simple, erect, sparsely leafy, 5 – 12 (- 15) cm.
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