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



1. Redfieldia flexuosa (Thurb.) Vasey, Torrey Bot. Club Bui. 14: 

 133. 1887. 



Graphephorum flexuosum Thurb. in A. Gray, Acad. Nat. Sci. 

 Phila. Proc. 1863: 78. 1863. 



Hopi Indian Reservation, Navajo County (Hough 119), sand hills, 

 August to September. South Dakota to Oklahoma, west to Arizona. 

 This grass is a valuable sand binder but is very rare in Arizona. 



9. DISTICHLIS. Saltgrass 



Dioecious perennials with creeping, scaly rhizomes, rigid culms, and 

 dense, few-flowered panicles; glumes broad, acute, keeled, 3- to 7- 

 nerved; lemmas closely imbricate, coriaceous; palea usually a little 

 shorter than the lemma. 



Plants of saline soils, of low forage value. 



Key to the species 



1. Keels of the palea broad, finely dentate; panicle congested, usually overtopped 

 by the leaves i 1. D. dentata. 



1. Keels of the palea narrow, entire; panicle relatively loose, usually exceeding 

 the blades 2. D. stricta. 



1. Distichlis dentata Rydb., Torrey Bot. Club Bui. 36: 536. 1909. 

 Hopi Indian Reservation, Navajo County (Hough 109), Chino 



Valley, Yavapai County (Allen 1131). Idaho and Washington to 

 Colorado, Arizona, and California. 



2. Distichlis stricta (Torr.) Rydb., Torrey Bot. Club Bui. 32: 602. 



1905. 



Uniola stricta Torr., Ann. Lye. N. Y. 1: 155. 1824. 



Navajo, Coconino, Pinal, Cochise, Pima, and Yuma Counties, 

 up to 5,000 feet, May to October. Saskatchewan to Texas, Arizona, 

 California, and Mexico. 



10. DACTYLIS. Orchardgrass 



Densely tufted perennial with flat leaf blades and open panicles; 

 spikelets subsessile in dense clusters at the ends of the branches; spike- 

 lets compressed, few-flowered; glumes unequal, acute, hispid, ciliate 

 on the keel; lemmas keeled, mucronate, ciliate on the keel. 



Orchardgrass is cultivated in some parts of the United States for 

 hay and pasturage. 



1. Dactylis glomerata L., Sp. PL 71. 1753. 



Navajo and Graham Counties, fields, meadows, and waste places. 

 Newfoundland to Alaska, south to Florida, Arizona, and California; 

 introduced from Eurasia. 



11. LAMARCKIA. Goldentop 



Low annual with dense one-sided panicles; fertile spikelet with 1 

 perfect floret and a rudimentary floret raised on a long rachilla joint; 

 lemma bearing a delicate awn just below the apex; sterile spikelets 

 composed of numerous imbricate empty lemmas. 



