Figure 4 



Figure 4 A. 



Fig. 4. Crab Grass (Digitaria sanguinalis) . Common in cultivated fields. 



Fig. 4-A. Smooth Crab Grass (Digitaria humifusa) ; a, leaf with sheath ; b, 



spikelet ; c, d, scales, stamens and pistils. Common in gardens and lawns. 



(Drawn by C. M. King.) 



