Part 3, 1915] POACKAB 



219 



ascending or tardily spreading; spikelets shorter-pediceled than in P. capillar e and more turgid, 

 2 mm. long, 0.9-1 mm. wide, elliptic; first glume about two fifths as long as the spikelet, acute 

 or blunt; second glume and sterile lemma equal, 5-nerved, but slightly exceeding the fruit, the 

 palea of the sterile floret wanting; fruit 1.6 mm. long, 0.8 mm. wide, elliptic. 



Type locality: Tennessee. 



Distribution: Pennsylvania to Minnesota, and south to Tennessee. 



Illustrations: Bull. Tenn. Exp. Sta. 7: pi. 10, f. 38; Contr. U. S. Nat, Herb. 15: /. 38; 

 Britt. & Brown, 111. Fl. ed. 2./. 317. 



24. Panicum philadelphicum Bernh. ; Trin. Gram. Pan. 216. 1826. 



Panicum capillare sylvaticum Torr. Fl. U. S. 149. 1824. Not P. sylvaticum Lam. 1798. 



Panicum porphyrium Trin.; Nees, Agrost. Bras. 198. 1829. 



Panicum Torreyi Fourn.; Hemsl. Biol. Centr. Am. Bot. 3: 497. 1885. 



Panicum capillare minimum Hngelm.; Gatt. Tenn. Fl. 94. 1887. 



Panicum minimum Scribn. & Merr. Circ. U. S. Dep. Agr. Agrost. 27: 4. 1900. 



Panicum soboliferum Tuckerm.; Scribn. & Merr. Rhodora 3: 106, as synonym. 1901. 



Plants light yellowish-green, in small tufts, freely branching, erect or rarely decumbent at 

 base, 15-50 cm. high, depauperate northern specimens sometimes forming small mats; culms 

 slender, papillose-hispid to nearly glabrous, more or less zigzag at base, the lower internodes 

 much shortened; leaf -sheaths mostly longer than the internodes, papillose-hispid; blades erect 

 or ascending, 4-15 cm. long, 2-6 mm. wide, rather sparsely hirsute, rarely nearly glabrous; 

 panicles exserted, diffuse, ovoid, 10-20 cm. long, forming one third the entire height of the 

 plant or more, few-flowered, the capillary, scabrous branchlets solitary, bearing rather short- 

 pediceled spikelets, usually in twos, at the ends; spikelets 1.7-2 mm. long, 0.7 mm. wide, ellip- 

 tic; first glume about two fifths the length of the spikelet, 5-nerved, acute; second glume and 

 sterile lemma equal, only slightly exceeding the fruit, the palea of the sterile floret wanting; 

 fruit 1.5 mm. long, 0.6 mm. wide, elliptic. 



Type locality: Philadelphia. 



Distribution: Maine to Wisconsin, and south to Georgia and Oklahoma. 



Illustrations: Bull. Tenn. Exp. Sta. 7: pi. 10, f. 39; Bull. U. S. Dep. Agr. Agrost. 17: /. 349 

 (as P. minus); Contr. U. S. Nat. Herb. 15: /. 40; Britt. & Brown, 111. Fl. f. 277 (as P. ?ninus)\ 

 ed. 2./. 318. 



25. Panicum capillare L. Sp. PI. 58. 1753. 



Milium capillare Moench, Meth. 203. 1794. 



Panicum Bobarti Lam. Encyc. 4: 748. 1797. 



Panicum capillare agreste Gatt. Tenn. Fl. 94. 1887. 



Panicum capillare vulgare Scribn. Bull. Tenn. Exp. Sta. 7: 44. 1894. 



Chasea capillaris Nieuwl. Am. Midi. Nat. 2: 64. 1911. 



Plants erect or ascending, simple or sparingly branched at the base or sometimes above, 

 20-80 cm. high; culms papillose-hispid to nearly glabrous, the pubescence dense at the nodes; 

 leaf -sheaths usually longer than the internodes, densely papillose-hispid; blades 10-25 cm. 

 long, 5-15 mm. wide, scarcely narrowed toward the rounded base, hispid on both surfaces, the 

 midrib prominent; panicles densely flowered, large and very diffuse, often half the length 

 of the entire plant, included at the base until maturity, the solitary or fascicled branches 

 at first ascending, at maturity divaricately spreading, the whole panicle breaking away and 

 rolling before the wind, the main axis and branches sparsely pilose, the numerous capillary, 

 scabrous branchlets bearing long-pediceled spikelets toward their ends; spikelets 2-2.5 mm. 

 long, 0.8-0.9 mm. wide, elliptic; first glume about half the length of the spikelet, acute, 5-7- 

 nerved; second glume and sterile lemma equal, more or less acuminate beyond the fruit, the 

 palea of the sterile floret wanting; fruit about 1.5 mm. long, 0.7-0.8 mm. wide, elliptic. 



Type locality: Virginia. . . 



Distribution: Maine to Montana, and south to Florida and Texas; introduced in Bermuda. 



Illustrations: Vasey, Agr. Grasses U. S. pi. 15; Bull. Tenn. Exp. Sta. 7: pi. 10, f. 37; Bull. 

 U S Dep. Agr. Agrost. 17: /. 35V; Ann. Rep. N. J. Mus. 1910: pi. 9,f. 3; Contr. U. S. Nat. Herb. 

 15: /. 42; Francis, Book Grasses 62, 63; Britt. & Brown, 111. Fl./. 274; ed. 2./. 315. 



Panicum capillare brevifolium Vasey; Rydb. & Shear, Bull. U. S. Dep. Agr. Agrost. 5: 21. 

 1897 Panicum barbipulvinatum Nash, in Rydb. Mem. N. Y. Bot. Gard. 1: 21. 1900. Milium 

 barbipulvinatum LAinell, Am. Midi. Nat. 4: 212. 1915. Differing in being on the average lower, m 

 having shorter, less pubescent blades crowded toward the base of the plant, shorter, exserted 

 panicles with divaricate branches, and larger spikelets, usually about 3 mm. long. The plants are 

 often depauperate and tufted and the blades sometimes white -margined. Wisconsm to British 

 Columbia, south to southern California and Texas. Originally described from Yellowstone Park. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 44. 



