42 CLASS III. ORDER III. 



Culm spreading, rough near the spike. Leaves broad, rough 

 forward ; stipules hairy. Spike single, rather cylindrical, com- 

 posed of crowded spikelets arranged in whorls. The spike feels 

 rough when drawn downward, being in this respect the reverse 

 of the former species, the bristles of which are differently beard- 

 ed. — Cultivated grounds. — July, August. — Annual. 



^§ Subgenus Echinochloa. Flowers in a coinpound clustered 

 panicle ; lower valve of the barren floret awned or acuminate. 



PANicufti CRus GALLi. L. Coclcsfoot Panic grass. 



Racemes compound, alternate and in pairs ; their 

 stalk five angled ; glumes terminating in hispid bris- 

 tles. 

 Syn. Echinochloa crus galli. R. df S. 



A large annual grass, two or three feet high, with broad flat 

 leaves. Panicle made up of compound crowded racemes, the 

 rachis five angled. Upper glumes terminating in aw'ns of vari- 

 ous length. — A common weed in cultivated ground. — August, 

 September. — Annual. 



^^^ Subgenus Digitaria. Flowers in digitate or fascicled 

 spikes, without bristles. 

 Panicum sanguinale. Purple Panic grass. 



Spikes digitate, about four; leaves and sheaths 

 somewhat hairy; flowers oblong, pubescent on the 

 margin. 

 Syn. Digitaria sangxjinalis. Mx. 



A common weed. Culm ascending at base and rooting from 

 the lower joints. Leaves a little waved and hairy. Spikes 

 linear, radiating from the top of the culm, their rachis compres- 

 sed, serpentine, with spikelets of two, three, or four flowers in 

 its depressions. — Cultivated grounds. — July, August. — Annual. 



§<^'5s^ Swfi^enus Panicum. Floiuers panicled, perfict fl.orets car- 

 tilaginous, unarmed. 



Panicum capillare. L. Hairy Panic grass. 



Sheaths very hairy ; panicle capillary, branching, 



