236 



INDUSTRIAL PLANTS 



Fig. 222. — Broom-corn (Andropogon Sorghum, Grass ^aInilJ^ Graminece). 

 A, flowering top of wild form, known as Johnson grass (.4. hnlepcnsis) 

 from which broom-corn and the various other cultivated sorgliums are 

 believed to have been derived. B, flowering top of a cultivated form 

 (var. vulgaris) which differs from the form used for brooms (var. 

 technicus)nia,in\y in having a more compact flower-cluster. Bd^, B9, 

 staminate and pistillate spikelets, enlarged. D, bract. K, fruit. 

 G, lodicules. (Rcichenbach.) — -Annual 2-3 m. tall; stem solid; flowers 

 concealed by bracts; fruit a grain. Native home, Mediterranean 

 Region (?). 



