GRASS FAMILY 



115 



9. Panicum huachucae Ashe. 

 Hairy Panicum. Fig. 2Z7 . 



Panicum huachucae Ashe, Journ. Elisha ISIitchell Soc. 15: 51. 1898. 



Vernal form usually stiffly upright, more or less 

 harsh-pubescent throughout ; culms 30-60 cm. long, the 

 nodes bearded; ligule of stiff hairs about 4 mm. long; 

 panicle 5-8 cm. long, the axis and usually the branches 

 pilose; spikelets about 1.6-1.8 mm. long, obovate, turgid, 

 pubescent : autumnal form stiffly erecl, the reduced 

 branches fascicled, the crowded blades ascending. 



Open ground, California (San Bernardino Mountains, Abfams), 

 and eastward; common in the Eastern States. June-Aug. Type 

 locality: Huachuca Mountains, Arizona. 



10. Panicum pacificum Hitchc. & Chase. 

 Pacific Panicum. Fig. 238. 



Panicum pacificum Hitchc. & Chase, Contr. U. S. Nat. Herb. IS: 

 229. /. 241. 1910. 



Vernal form light green, more or less papillose-pilose 

 throughout, 30-60 cm. tall; ligule ciliate, about 4 mm. 

 long; spikelets 1.8-2.0 mm. long, obtuse, pubescent; 

 ,^ autumnal form prostrate-spreading, repeatedly branch- 

 ing from the upper and middle nodes. Distinguished 

 from P. occidcntalc by the more copious pubescence 

 throughout, more leafy culms, and, in the autumnal 

 phase, by the branching habit. 



Sandy shores and slopes, and moist crevices in rocks, British 

 Columbia to San Bernardino Mountains. June-Aug. Type lo- 

 cality: Castle Crag, California. This and allied species have 

 been included under P. dichotonium in Pacific Coast botanies. 



11. Panicum occidentale Scribn. 

 Western Panicum. Fig. 239. 



Panicum occidcntalc Scribn. Rep. Mo. Bot. Card. 10: 48. 1899. 



Vernal form yellowish green ; culms slender, 10-20 

 cm. long, spreading, sparsely pubescent ; leaves tending 

 to be clustered toward the base ; sheaths sparsely pubes- 

 cent ; ligule ciliate, about 4 mm. long; blades glabrous 

 or nearly so above, appressed-pubescent beneath; 

 panicle 5-8 cm. long, open; spikelets 1.8 mm. long, 

 pubescent; autumnal form liranching from the lower 

 nodes, forming a spreading tussock ; leaves and 

 panicles reduced. 



Peat bogs and moist soil, common from British Columbia to 

 southern California. June-Aug. Type locality: Nootka Sound. 



