92 GRAMINEAE 



Kefs. — Panicum barbipulvinatum Nash in Rydb. Mem. N. Y. Bot. Gard. 1 : 21. 1900. Thia 

 species is described under P. capillare in: Thiirb. in Wats. Bot. Cal. 2: 25S. 1880; Davy in 

 Jepson, Fl. W. Mid. Cal. 32. 1901; Abrams, PI. Los Ang. 24. 1904. 



5. P. hirticaule Presl. Annual, erect or nearly so, i/o to 2 feet high, more 

 or less papillose-hispid throughout, especially on the sheaths; blades 2 to 6 

 lines wide, often sparsely hispid toward the often cordate base ; panicle 3 to 

 6 inches long, scarcely Vs the height of the entire plant, open, the branches 

 ascending; spikelets about l^/a lines long, acuminate, usually reddish bro-svn. 



Sierra Nevada, Lemmon in 1875; San Diego Co. (Jamaeha, Canhy in 1894) 

 to Texas and Central America. 



Bef.— Panicum hirticaule Presl, Eel. Haenk. 1 : 308. 1830. 



6. P. miliaceum L. Annual, as much as 3 feet high ; culms and leaves more 

 or less papillose-hispid; panicle 4 to 12 inches long, usually nodding, rather 

 compael, the numerous branches ascending, scabrous, spikelet-bearing toward 

 the summit; spikelets about 2i/o lines long, ovate, acuminate, strongly many- 

 nerved; first glume i/o the length of tlie spikelet, acuminate. 



A native of the Old World, cultivated in the U. S. under the name of Hog 

 Millet and Broom-corn Millet. Scattered specimens, introduced or escaped 

 from cultivation, are found throughout the U. S. 



Locs. — Kenwood, Smith in 1898; Sacramento, Williams in 1906; Riverside, Seed 3112. 



Ref. — Panicum miliaceum L. Sp. PI. 58. 17.53. 



P. AGROSTOiDES Spreng. PL Pugill. 2: 4. 1815; Thurb. in Wats. Bot. Cal. 2: 

 258. 1880. In the National Herbarium is a specimen of this species collected 

 by the Wilkes Exploring Expedition, "On the Sacramento." This is far out of 

 its range and the species has not since been collected in California. 



7. P. urvilleanum Kunth. Plants robust, 2 to 3 feet high, perennial from 

 creeping rhizomes ; culms solitary or few in a tuft, the nodes densely bearded 

 but usually hidden by the harshly villous sheaths ; blades 2 to 3 lines wide, flat, 

 tapering to a long involute-setaceous point; panicle about a foot long, open; 

 spikelets 3 t-o 314 lines long, densely silvery or tawny- villous ; first glume 

 acuminate, % to nearly as long as spikelet. 



Sandy deserts, southern California and Arizona, appearing again in Chile 

 and Argentina. 



Locs. — Barstow, Chase 5766; Hesperia, Abrams 2164; Palm Springs, Wilder 1082; Edom, 

 Chase 5519. 



Refs.— Panicum urvilleanum Kunth, Rev. Gram. 2: 403. pi. 115. 1830; Thurb. in Wats. Bot. 

 Cal. 2: 259. 1880. Var. longigluine Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 17. (ed. 2.): 

 49. 1901, type from San Jacinto, Parish Bros. 887. 



B. Subgenus Dich.vnthelium Hitchc. & Chase. Tufted perennials, producing 

 winter rosettes of leaves different in appearance from the culm leaves ; 

 vernal culms slender, simple, bearing small open, comparatively few- 

 flowered, terminal panicles; autumnal culms much-branched, presenting a 

 distinct aspect, because of the numerous reduced branches, leaves and 

 panicles. 



8. P. lindheimeri Nash. Vernal culms stiffly ascending or spreading, 1 to 

 2 feet high, glabrous, or the lower portion somewhat pubescent ; leaves glabrous 

 except the ciliate margin of the lower part of the blades; ligule a ring of cilia 2 

 to 2% lines long ; panicle 2 to 3 inches long, open ; spikelets % line long, obo- 

 vate, obtuse, turgid, pubescent; autumnal form stifBy spreading or radiate-pros- 

 trate, with tufts of short appressed branches at the nodes; blades reduced, 

 involute-pointed, often conspicuously ciliate at the base. 



