152 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



6. Andropogon glomeratus (Walt.) B. S. P., Prelim. Cat. N. Y. 67. 



1888. 



Cinna glomerata Walt., Fl. Carol. 59. 1788. 



Coconino and Maricopa Counties, at low altitudes, moist ground 

 and rocky slopes, July to September. Massachusetts to Florida, west 

 to Kentucky, Arizona, and southern CaHfornia. 



7. Andropogon barbinodis Lag., Gen. et Sp. Nov. 3. 1816. 



Amphilophis leucopogon (Nees) Nash, North Amer. FL 17: 126. 

 1912. 



Coconino, Yavapai, Pinal, Maricopa, Cochise, Santa Cruz, and 

 Pima Counties, 1,000 to 5,300 feet, open sandy or gravelly ground 

 and rocky slopes, May to October. Oklahoma and Texas to California 

 and Mexico. 



8. Andropogon saccharoides Swartz, Prodr. Veg. Ind. Occ. 26. 



1788. 



Amphilophis saccharoides Nash, North Amer. Fl. 17: 125. 

 1912. 



Coconino, Yavapai, Santa Cruz, and Pima Counties, 2,000 to 4,000 

 feet, prairies and rocky slopes, June to October. Missouri to Colorado, 

 Alabama, Arizona, and southern California. 



75. SORGHUM 



Coarse rhizomatous perennial with flat leaf blades and open panicles 

 of short few-flowered racemes; sessile spikelet ovate with a twisted 

 geniculate awn, the glumes indurate; pedicellate spikelet lanceolate, 

 awnless, the glumes membranaceous. 



Johnsongrass (S. halepense), because of the large size of the plant, 

 rank growth, and difficulty of eradication, is a very costly pest in the 

 irrigated valleys of southern Arizona where it thrives to the detriment 

 of all summer field crops. The seeds were formerly eaten by the 

 Pima Indians. The plant produces much pollen, to which many 

 persons are allergic. Many varieties of S. vulgare Pers. are cultivated 

 for grain, ensilage, or sirup. Sudan grass (S. vulgare var. sudanense) 

 yields large quantities of forage on irrigated lands in this State. 

 Under certain conditions the sorghums (including Johnsongrass) 

 cause prussic-acid poisoning in livestock. 



1. Sorghum halepense (L.) Pers., Syn. PI. 1: 101. 1805. 



Holcus halepensis L., Sp. PI. 1047. 1753. 



Throughout the State, up to 5,000 feet, a weed in waste places, 

 fields, and along irrigation ditches, flowering April to November. 

 Massachusetts to Iowa, south to Florida, Texas, Arizona, and southern 

 California; naturalized from the Old World. 



76. SORGHASTRUM. Indian-grass 



A rather tall, tufted, rhizomatous perennial, with flat, narrow leaf 

 blades and narrow rather dense terminal panicles of 1- to 3-jointed 

 racemes; sessile spikelet perfect, the glumes coriaceous, brownish, the 

 first glume sparsely hirsute, the fertile lemma hyaline, extending into 



