Hymenachne donacifolia Chase

Similar in habit, appearance, and vegetative characters to H. amplexicaulis; blades usually widened above the base, more or less asymmetric, as much as 5.5 cm. wide; panicles mostly 25-35 cm. long, attenuate, dense, the branches rather slender but densely flowered, narrowly ascending to somewhat spreading, the lower ones 5-10 cm. long, floriferous to the base; spikelets 2-2.5 mm. long, acute, the second glume and sterile lemma scabrous on the midnerve, but not prominently as in H. amplexicaulis.