HITCHCOCK AND CHASE — NORTH AMERICAN PANICUM. 215 



Panicum huachucae Ashe, Journ. Elisha Mitchell Soc. 15: 51. 1898. "Based on: 

 Lemmon: P. dichotomum var. nitidum, subvar. barbulatum; Huachuca Mountains, 

 Arizona, 1882." Such a specimen could not be found in Ashe's herbarium, but in 

 the National Herbarium is a specimen so labeled which agrees with the description 

 and which is doubtless the type, since Mr. Ashe visited the National Herbarium in 

 the summer of 1898 and took notes on species of Panicum. This specimen consists 

 of several slender culms beginning to branch and with overmature panicles. 



Panicum lanuginosum huachucae Hitchc. Rhodora 8 : 208. 1906. Based on Panicum 

 huachucae Ashe. 



This species has been referred by some recent American authors o to Panicum 

 unciphyllum Trin.k 



DESCRIPTION. 



Vernal form cespitose, usually stiffly upright, light olivaceous, often purplish, 

 harsh to the touch from the copious, spreading, papillose pubescence of culms and 

 leaves; culms 20 to 60 cm. high; nodes bearded with spreading hairs; sheaths shorter 

 than the internodes; ligules 3 to 4 mm. long; blades firm, stiffly erect or ascending, 

 4 to 8 cm. long, 6 to 8 mm. wide, the veins inconspicuous, the upper surface copiously 

 short-pilose, especially toward the base, the lower 

 surface deusely pubescent; panicle rather short- 

 exserted until maturity, 4 to 6 cm. long, nearly as 

 wide, rather densely flowered, the axis and often 

 the branches pilose, the flexuous, fascicled 

 branches ascending or spreading, short spi'kelet- 



bearing branchlets at base of the fascicles; spike- 



li ^° jn _ , ., ., , . , Fig. 221.— P. huachucae. From type speci- 



lets 1.6 to 1.8 mm. long, 1 mm. wide, obovate, men in National Herbarium. 



obtuse, turgid, papillose-pubescent; first glume 



about one-third the length of the spikelet; second glume and sterile lemma subequal, 



scarcely covering the fruit at maturity; fruit 1.5 to 1.6 mm. long, 1 mm. wide, elliptic, 



obscurely apiculate. 



Autumnal form stiffly erect or ascending, the culms and sheaths sometimes papillose 

 only, the branches fascicled, the reduced, crowded leaves ascending, the blades 2 to 

 3 cm. long, much exceeding the reduced panicles. 



This species is variable as to amount of pubescence and as to the stiffness of the 

 leaves, and it intergrades with the following subspecies. A specimen collected by 

 Havard at El Paso, Texas, is referred here, though it is an unusual form with wider 

 blades and spreading habit suggesting P. lindheimeri. 



DISTRIBUTION. 



Prairies and open ground, Maine to South Dakota and south to North Carolina and 

 southern California. 



Maine: North Berwick,. Par lin 1186, 1189. 

 Vermont: Burlington, Hitchcock 133. 

 • Massachusetts: Wellesley, Smith 737. 



Connecticut: Southington, Andrews 70; New London, Gravest. 

 New York: Vaughns, Burnham in 1897; Pavilion, Hill 182 in 1907; Westfield, 

 Hill 171 in 1907; Jamaica, Biclnell in 1905; Hempstead, Biclnell in 1903; 

 Woodmere, Bichnell in 1907. 

 Ontario: Gait, Herriot 14; Niagara, Macoun 26337; Belleville, Macoun 29369; 



Long Point, Herriot 44. 

 New Jersey: Netcong, Mackenzie 2075. 



aScribner and Merrill, Rhodora 3: 121. 1901; Nash in Britton, Man. 1040.1901. 

 & See synonymy under P. tenue Muhl., page 259. 



