Zeugites panamensis Swallen

Perennial; culms erect, about 1 m. high, sparingly branched; sheaths much longer than the internodes, glabrous, distinctly keeled toward the truncate sum mit, with rather prominent cross-veins toward the margins; ligule membranaceous, somewhat erose, about 1 mm. long; blades 9-21 cm. long, 2-4.8 cm. wide, broadly lanceolate, acuminate, rounded or subcordate at the base, glabrous, conspicuously cross-veined, the petioles stout, 2-20 mm. long; panicles 10-15 cm. long, 10-12 cm. wide, the branches ascending to reflexed, the branchlets appressed, becoming divaricate with age; spikelets 8-12 mm. long, 4-to 6-flowered, the first floret pistillate, the others staminate, the pedicels 2-10 mm. long or sometimes even as much as 15 mm. long; glumes equal, 5 mm. long, obtuse (the first rarely sub