GRASS FAMILY 



141 



10. Muhlenbergia jonesii (Vasey) Hitchc. 

 Jones's Muhlenbergia. Fig. 307. 



Sporobolns jonesii Vasey, Bot. Gaz. 6: 297. 1881. 

 Muhlenbergia jonesii Hitchc. in Jepson, Fl. Calif. 1: 111. 1912. 



.Perennial; culms cespitose, erect, slender, about 30 

 cm. tall; blades mostly basal, involute, fle.xuous, scabrous; 

 panicles narrow, loose, 5-7 cm. long ; glumes equal, obtuse, 

 toothed at apex, a little more than 1 mm. long; lemma 4 

 mm. long, acuminate, awn-pointed. 



Only known from northeastern California. July-Aug. Type 

 locality: Soda Springs. 



11. Muhlenbergia porteri Scribn. 



Mesquite-grass, Porter's Muhlenbergia. 



Fig. 308. 



Muhlenbergia texana Thurb. in Port. & Coult. Svn. Fl. Colo. 



144. 1874, not Buckl. 1863. 

 Muhlenbergia porteri Scribn.; Beal, Grasses X. Am. 2: 259. 



1896. 



Perennial; culms woody or persistent at base, 

 numerous, wiry, widely spreading or ascending 

 through bushes, scaberulous, more or less branched 

 from all the nodes, 30-100 cm. tall or more ; sheaths 

 smooth, spreading away from the branches, the 

 prophyllum conspicuous ; blades small, flat, 2-5 cm. 

 long, early deciduous from the sheath ; panicles 5-10 

 cm. long, open, the slender branches and branchlets 

 lirittle. widely spreading, bearing rather few long- 

 pediceled spikelets ; glumes narrow, acuminate, 

 slightly unequal, the second longer, about 2 mm. 

 long ; lemma purple, acuminate, minutely pilose, 3-4 

 mm. long, the awn about 6 mm. long. 

 Rocky deserts, southern California (San Felipe) to Texas and northern Me.xico. June. Type locality: 

 Texas. 



12. Muhlenbergia montana (Nutt.) Hitchc. 

 Mountain Muhlenbergia. Fig. 309. 



Calxcodon montanum Nutt. Journ. Acad. Phila. II. 1: 186. 



1848. 

 Muhlenbergia trifida Hack. Repert. Nov. Sp. Fedde 8: 518. 



1910. 

 Muhlenbergia montana Hitchc. U. S. Dept. Agr. Bull. 772: 



145. 1920. 

 Muhlenbergia gracilis of authors, not (H. B. K.) Trin. 



Perennial ; culms densely cespitose, erect from a 

 short decumbent rhizomatous base, smooth or sca- 

 brous above, 15-40 cm. tall; sheaths smooth or sca- 

 brous ; ligule 4-6 mm. long ; blades crowded at base, 

 involute, scabrous, sharp-pointed; panicles narrow, 

 loose, 5-10 cm. long; glumes broad, oblong, sparsely 

 pubescent, 2 mm. long, obtuse or more or less erose 

 at apex, the second 3-toothed; lemma 3 mm. long, 

 sparsely pubescent at base and margins, gradually 

 narrowed into a slender, more or less flexuous awn 

 1.5-2 cm. long. 



Dry ground, in the Arid Transition Zone; middle Sierra 

 Nevada Mountains (Yosemite Valley, Mount Tallac), east to 

 Wyoming, south to Oaxaca. June-July. Type locality: 

 Santa Fe, New Me.xico. 



