Part 3, 1915] . POACEAE 283 



Autumnal phase erect or leaning, branching from the upper and middle nodes after the 

 maturity of the primary panicle, these primary branches often longer than the internodes and 

 producing short, fascicled, appressed branchlets with reduced spreading blades from then- 

 uppermost nodes, the numerous small panicles partly included; winter rosette appearing late, 

 the blades lanceolate, firm, sometimes ciliate. 



Type locality: Eustis, Florida. 

 Distribution: South Carolina to Florida. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 11: pi. 2; 17: /. 395; Contr. U. S. Nat. Herb. 

 15: /. 350. 



198. Panicum albomaculatum Scribn. Circ. U. S. Dep. Agr. Agrost. 



19: 2. 1900. 



Vernal culms tufted, 50-100 cm. high, arising from a knotty crown, erect, slender but 

 stiff, minutely puberulent to hirsute; leaf -sheaths long, the lower overlapping, puberulent to 

 hirsute, more or less mottled with white spots, densely short-ciliate on the margin; ligule about 

 0.2 mm. long; blades firm, spreading or ascending, reflexed when old, 8-17 cm. long, 9-15 

 mm. wide, linear-lanceolate, acuminate, rounded and ciliate at the base, roughish on the upper 

 surface and with a narrow line of appressed pubescence along the very scabrous margins, 

 glabrous or obscurely pubescent beneath, rarely hirsute on both surfaces; panicles long- 

 exserted, ovate in outline, 10-16 cm. long, two thirds to three fourths as wide, loosely flowered, 

 the axis and ascending branches glabrous, or the former somewhat pilose; spikelets 2.8 mm. 

 long, 1.2 mm. wide, obovate-elliptic, obtuse, sparsely pubescent; first glume nearly or quite 

 half the length of the spikelet, obtuse, or subacute; second glume and sterile lemma equaling 

 the fruit at maturity; fruit 2.2 mm. long, 1.2 mm. wide, elliptic, subacute. 



Autumnal phase not known. 



Typs locality: Patzeuaro, Mexico. 

 Distribution: Southern Mexico and Guatemala. 

 Illustrations: Contr. TJ. S. Nat. Herb. 15: /. 352. 



199. Panicum clandestinum L. Sp. PI. 58. 1753. 



Milium clandestinum Moench, Meth. 204. 1794. 



Panicum latifolium clandestinum Pursh, Fl. Am. Sept. 68. 1814. 



Panicum pedunculatum Torr. Fl. U. S. 141. 1823. 



Panicum clandestinum pedunculatum Torr. Fl. N. Y. 2: 426. 1843. 



Panicum decolor atum Nash, Bull. Torrey Club 26: 570. 1899. 



Chasea clandestina NieuwI. Am. Midi. Nat. 2: 64. 1911. 



Vernal phase in large, dense clumps, sometimes with strong rootstocks, 5-10 cm. long; 

 culms stout, 70-150 meters high, erect, scabrous to papillose-hispid, at least below the nodes; 

 leaf-sheaths as long as the internodes or overlapping until after the branches appear, loose, 

 strongly papillose-hispid to nearly glabrous, a puberulent ring at the summit; ligule 0.5 mm. 

 long; blades spreading or finally reflexed, 10-20 cm. long, 1.2-3 cm. wide, slightly tapering to 

 the cordate-clasping base, acuminate, scabrous on both surfaces, at least toward the end, 

 usually ciliate at the base; panicles finally rather long-exserted, 8-15 cm. long, about three 

 fourths as wide, many-flowered, the flexuous branches in distant fascicles, with short spikelet- 

 bearing branchlets in the axils; spikelets 2.7-3 mm', long, 1.4-1.5 mm. wide, obovate-oblong, 

 sparsely pubescent; first glume one third the length of the spikelet, subacute or obtuse; second 

 glume slightly shorter than the fruit and sterile lemma ; fruit elliptic, 2.1-2.3 mm. long, 1.2-1.3 



mm. wide. 



Autumnal phase erect or leaning, sparingly branching, often before the maturity of the 



primary panicle, from the middle and upper nodes, the branches leafy, the swollen, bristly 



sheaths overlapping on the shortened internodes and inclosing wholly or partially the secondary 



panicles; spikelets more turgid than those of the primary panicles. 



Typb locality: Pennsylvania. 



Distribution: Maine to Kansas, and south to Florida and eastern Texas. 

 Illustrations: Bull. Tenn. Exp. Sta. 7: pi. 11, f. 43; Bull. U. S. Dep. Agr. Agrost. 17: /. 388; 

 Contr. U. S. Nat. Herb. 15: /. 353; Francis, Book Grasses 72; Britt. & Brown, 111. Fl./. 257; ed. 



2./. 386. 



