218 NORTH AMERICAN FLORA [Volume 17 



cending, mostly from the lower side; spikelets short-pediceled, somewhat appressed to the 

 rachis, 3.3-3.7 mm. long, about 1 mm. wide, lanceolate, acuminate, glabrous; first glume one 

 fourth to nearly one third the length of the spikelet, broadly triangular, usually subacute, 

 3-nerved; second glume and sterile lemma subequal, exceeding the fruit and pointed beyond 

 it, 7-9-nerved; fruit about 2.5 mm. long, 0.7 mm. wide, rather abruptly acuminate. 



Type locality : Near Guadalajara, Jalisco. 



Distribution: Southern Mexico. 



Illustration; Contr. U. S. Nat. Herb. 1*7: f. 30. 



21. Panicum elephantipes Nees, Agrost. Bras. 165. 1829. 



Panicum fistulosum Hochst.; Steud. Syn. Gram. 71. 1854. 



Perennial; culms ascending from a decumbent, often widely creeping base, rooting at the 

 nodes, succulent, as much as 2 cm. thick, usually 1-2 meters high, glabrous, the nodes glabrous, 

 usually conspicuously dark-colored; leaf-sheaths glabrous, longer than the internodes, loose, 

 the lower often tessellate by cross partitions between the nerves; ligule about 3 mm. long; 

 blades 15-50 cm. long, 7-20 mm. wide, glabrous beneath, pilose above, at least near the base; 

 panicles large and open, as much as 40 cm. long, the short branchlets appressed along the as- 

 cending branches; spikelets 4-5 mm. long, lanceolate, acuminate; first glume one fifth to one 

 fourth the length of the spikelet, subacute or obtuse, rarely pointed and one third the length of 

 the spikelet; second glume and sterile lemma subequal, 7-9-nerved, the palea of the sterile 

 floret wanting; fruit 3-4 mm. long, about 0.8 mm. wide, lanceolate, acuminate, the margins 

 of the lemma above the middle thin and not inrolled. 



Type locality: Pari, Brazil. 



Distribution: West Indies; Guatemala; also in tropical South America. 



Illustration: Contr. U. S. Nat. Herb. 15: /. 35. 



22. Panicum flexile (Gatt.) Scribn.; Kearney, Bull. Torrey 



Club 20: 476. 1893. 



Panicum capillar e flexile Gatt. Tenn. Fl. 94. 1887. 



Panicum minus Nash, Bull. Torrey Club 22: 421, excluding description. 1895. 

 Chasea flexilis Nieuwl. Am. Midi. Nat. 2: 65. 1911. 



Plants erect, much branched from the base, 20-70 cm. high; culms slender, glabrous, or 

 somewhat hispid below, the nodes pubescent; leaf-sheaths papillose-hispid^ the hairs shorter than 

 in P. capillar e; blades erect but not stiff, glabrous or sparsely hispid, as much as 30 cm. long, 

 2-6 mm. wide, rarely narrower; panicles rather few-flowered, oblong, narrow, 10-20 cm., rarely 

 30 cm. long, about one third as wide, the branches at first narrowly ascending, somewhat 

 spreading at maturity, the peduncle of the panicle not brittle and readily breaking as in P. 

 capillare; spikelets long-pediceled, 3.1-3.5 mm. long, 0.9-1 mm. wide, lanceolate, acuminate; 

 first glume about one third the length of the spikelet ; second glume slightly longer than the 

 sterile lemma, both 7-9-nerved, much exceeding the fruit, the palea of the sterile floret wanting ; 

 fruit 2 mm. long, 0.9 mm. wide, elliptic. 



Type locality: Nashville, Tennessee. 



Distribution: Ontario to South Dakota, and south to Florida and Texas. 

 Illustrations: Bull. Tenn. Exp. Sta. 7: pi. 10, f. 40; Bull. U. S. Dep. Agr. Agrost. 17: /. 346: 

 Contr. U. S. Nat. Herb. 15: /. 36; Britt. & Brown, III. Fl. /. 275; ed. 2./. 319. 



23. Panicum Gattingeri Nash, in Small, Fl. SE. U. S. 92, 1327. 1903. 



Panicum capillare campestre Gatt. Tenn. Fl. 94. 1887. Not P. campestre Nees, 1826. 



Panicum capillare geniculatum Scribn.; Kearney, Bull, Torrey Club 20: 477. 1893. Not P. 



geniculatum Lam. 1798. 

 Panicum capillare Gattingeri Nash, in Britt. & Brown, 111. Fl. 1: 123. 1896. 



Plants at first erect, but soon decumbent-spreading and rooting .at the lower nodes, freely 

 branching from the lower and middle nodes; culms papillose-hispid, in robust specimens as much 

 as 1 meter in length; leaf -sheaths hispid like the culms; blades 10-20 cm. long, 6-10 mm. wide, 

 narrow to a rounded base, more or less hispid on both surfaces or nearly glabrous; panicles 

 numerous, terminating the culms and main branches and axillary at most of .the nodes, short- 

 exserted or, especially the axillary, included at base, oval or elliptic in outline, the terminal 

 10-15 cm. long, two thirds as wide, the lateral smaller, rather densely flowered, the branches 



