120 PANICACE^. 



hispidum Muhl, Gram. 107 (1817). P. muricatum Michx. Fl, 

 Bor. Am. 1: 47 (1803). Tall and coarse, with awns sometimes 1-2 

 cm. long. Found with the sjiecies. 



Michigan, Beal for M. A. C. 13. 



Var. sabulicolum (Nees) Trin. in Herb. Panicum sahiilicoliim 

 Nees, Agrost. Bras. 2: 258 (1820). OpUsmenus sahulicolns Kunth, 

 Enum. PI. 1 : 145 (1833). Stout, 60-90 cm. high. Spikelets 

 lance-elliptical, 5-6 mm. long. 



Mexico, Pi-ingle 1404. 



Wet places, Mexico to South America. 



24. P. Palmeri Xh&qj, Contrib. U. S. Xat. Herb. 1:281 

 (1893). 



Annual ; culms 120-180 cm. higli, erect, slender. Ligule 

 short ; blades smooth, 30-40 cm. long, 2-4 cm. wide. Panicle 

 pyramidal, 15-20 cm. long, rays single, the longest 5-10 cm. long, 

 flower-bearing to the base, rachis rough, tiquetrous, less than 1 mm. 

 wide, straiglit or flexuose. Spikelets single, imbricate, alternate 

 on two sides of the rachis, subsessile, each spikelet subtended by a 

 bristle exceeding its own leugtb, ovate-lanceolate, about 4 mm. 

 long; first glume about 1 mm. long, 1-3-nerved, second 11-13- 

 nerved; floral glume of the sterile floret much like the latter, 5- 

 nerved; palea broad-oval, fertile floret nearly smooth, ovate-ellipti- 

 cal, mucronate, 2.5 mm. long. 



Mexico, Palmer "dl^; U. S. Dej)t. Agrici(I.,-ii specimen culti- 

 vated from seed sent from Mexico. 



25. P. Reverchoni Vasey, Bull. Bot. Divis. U. S. Dept. 

 Agricul. 8: 25 (1889). 



A rather slender, sparingly branching perennial, 25-60 cm. high, 

 with short, stout rootstocks. Ligule a ciliate ring ; blades firm, 

 flat, or involute, mostly scabrous, 10-15 cm. long, 1-2.5 mm. wide, 

 points slender. Panicle very simple, spikelike, much interrupted, 

 5-15 cm. long, the longest ray 2-3 cm. long, the short pedicels 

 each bearing a short bristle below the apex. Spikelike, oval, obtuse, 

 2-3.5 mm. long, first glume deltoid, 3-5-nerved, less than half as 

 long as the spikelet, second and third equal, 5-7-nerved, fertile 

 floret oval, plano-convex, subacute, rugose with fine transverse 



