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Culm 3–6° high; leaves about 6´´ wide; cymes decompound, diffuse; bristles awl-shaped, stout, unequal, shorter than the achene.—Wet places, Penn. to Fla., west to S. Ind. and Mo. 14.

Having a forked petiole, and a pair of leaflets at the end of each division; biconjugate; twice paired; Ð said of a decompound leaf.

But if the division goes still further, or if the degree is variable, we simply say that the leaf is decompound; either palmately or pinnately decompound, as the case may be.

We have this advantage in the analysis of atmospherical air, being able both to decompound it, and to form it a new in the most satisfactory manner.

Cymes decompound, or in the northern form somewhat simple and smaller, and the spikelets usually more clustered; bristles capillary, twice the length of the achene.—Borders of ponds, Mass. to N. J. and Fla.; rare.