Panicum paludosum
Plants perennial; more or less cespitose, rhizomatous or stoloniferous, free-floating or rooting in shallow water. Culms 30-150 cm tall, 3-7 mm thick, compressed, spongy, glabrous, decumbent and rooting at the lower nodes in shallow water; nodes glabrous; internodes glabrous, smooth. Sheaths usually shorter than the internodes, not keeled, glabrous or sparsely hispid distally; ligules 1-4 mm; blades 10-40 cm long, 5-15 mm wide, flat, glabrous, contracted basally, attenuate distally, apices acute. Panicles 10-25 cm long, 5-17 cm wide, shortly exserted or included basally; primary branches 4-12 cm, ascending to spreading, secondary and higher order branches confined to the distal 2/3, pedicels 1-4 mm, sharply 3-angled, ascending to appressed. Spikelets 3-4 mm long, 0.8-2 mm wide, lanceolate. Lower glumes 0.5-0.9 mm, 1/5 – 1/3 as long as the spikelets, rounded, glabrous, truncate, weakly 1-3-veined; upper glumes and lemmas subequal, glabrous, 9-11-veined, veins prominent, apices acute to accuminate; lower paleas about 2/3 as long as the lower lemmas; lower florets sterile; upper florets 2-2.7 mm, narrowly ellipsoid, smooth, shiny, yellowish. 2n = 54.
Discussion
Panicum paludosum is an Asian species that grows in shallow water. It has been found in Baltimore, Maryland, but may not be established there.
Selected References
None.
Lower Taxa
"decumbent" is not a number."-11-veined" is not declared as a valid unit of measurement for this property.