Echinochloa 



Paniceae 



175 



50 



Map 326 



Setaria lutescens (Weigel) F. T. Hubb. 



o 50 



Map 327 

 Setaria viridis (L.) Beauv. 



which is not true. While it is found in waste places about barns and dwell- 

 ings, it is found in almost all kinds of habitats except dense shade. It 

 prefers the sunshine. As to soil requirements, it is found from minimacid 

 soils to the marl borders of lakes. It prefers a moist soil but will grow in 

 wet or dry places. It is found in roadside and dredged ditches, in low 

 places about lakes, in bayous, along streams, and in cultivated fields and 

 pastures. 



"I am regarding this species as a polymorphic one. A careful examina- 

 tion of more than 60 Indiana specimens shows that sheaths are usually 

 glabrous, but sometimes the lower ones are scabrous to more or less papil- 

 lose-hispid. The spikelets are usually more or less awned, the awns up to 

 3 cm long, but the spikelets of some panicles are all or nearly all awnless. 

 In one specimen the primary panicle has awnless spikelets and the axillary 

 panicle has awned spikelets. In another specimen the reverse is true. The 

 spikelets of some panicles have scarcely any papillose hairs while those of 

 others rarely have hairs without the papillose base. The amount and 

 length of the pubescence vary on the same plant as well as on separate 

 plants. The color of the spikelets varies from green to purple. In ponds 

 and sloughs, where germination may be delayed on account of the reces- 

 sion of the water, I have seen mature plants only a few inches high in 

 fruit while on the higher margin of the same pond would be plants several 

 feet high. 



"Some authors have given names to the many forms of this species. 

 Some variations have been called species, some varieties, and some forms. 

 The limit in assigning names seems to have been reached by Jackson who 

 named a 'variegated purple form' of the awnless form (Guide to Nature 

 16: 11. 1923). For a discussion of the so-called varieties and forms see 

 the literature cited." (Deam, Grasses of Ind. p. 304-305, 1929.) 



Hitchcock, in his manual of the grasses of the United States, also re- 

 gards this species as polymorphic, but recognizes an awnless variety. 



N. B. to Wash., southw. to Fla. and Calif. ; Eastern Hemisphere. 



