242 NORTH AMERICAN FLORA [Volume 17 



88. Panicum Haenkeanum J. Presl, in Presl, Rel. Haenk. 1: 304. 



1830. 



Panicum coslaricense Hack. Oesterr. Bot. Zeits. 51: 428. 1901. 



Plants perennial, straggling, with culms as much as 2 meters long often rooting at the 

 nodes; culms slender, erect, 0.5-1 meter high, sparingly branched, striate, glabrous or minutely 

 pubescent ; leaf -sheaths much shorter than the elongate internodes, papillose-pilose to glabrate, 

 ciliate at least toward the summit; ligule membranaceous, ciliate, about 0.5 mm. long; blades 

 5-10 cm. long, 6-12 mm. wide, narrowed toward the base, long-acuminate, very sparsely 

 pilose on both surfaces or glabrate; panicles ovoid in outline, 10-15 cm. long, about two thirds 

 as wide, loosely flowered, the slender, flexuous branches ascending or spreading, bearing delicate 

 branchlets throughout, the scattered spikelets on capillary, flexuous pedicels; spikelets 2.4 mm. 

 long, 0.7 mm. wide, elliptic, acute, rather strongly nerved; first glume nearly half the length 

 of the spikelet, acute, hirsute toward the margin; second glume and sterile lemma sub-equal, 

 pointed beyond the fruit, hirsute toward the margin and with very minute papillae bordering 

 the nerves; fruit 1.7 mm. long, 0.6 mm. wide, elliptic, smooth and shining, the margins of the 

 lemma near the base each bowed out into a little angle, giving a somewhat auricled appearance 



Typ3 locality: Mexico. 

 Distribution : Mexico to Panama. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 129, 



89. Panicum trichanthum Nees, Agrost. Bras. 210. 1829. 



? Milium microspermum Lag. Gen. & Sp. Nov. 2. 1816. 



Panicum guayaquilense Steud. Syn. Gram. 85. 1854. 



Panicum microspermum Fourn.; Hemsl. Biol. Centr. Am. Bot. 3: 492. 1885. 



Plants often in large bunches; culms ascending from a decumbent base, as much as 1-2 

 meters long, rather stout, glabrous ; leaf-sheaths shorter than the internodes, ciliate, and usually 

 with a villous ring at the juncture with the blade, otherwise glabrous or rarely pubescent toward 

 the summit; ligule membranaceous, less than 0.5 mm. long; blades oblong-lanceolate, usually 

 10-15 cm. long, 10-15 or rarely 25 mm. wide, cordate, rather strongly nerved, glabrous or 

 puberulent, often pilose above the ligule ; panicles 10-30 cm. long, the axis glabrous, the numer- 

 ous branches and branchlets and the long pedicels capillary, flexuous; spikelets 1.2-1.4 mm. 

 long, 0.6 mm. wide, ob ovate-fusiform, acute; first glume less than one fifth the length of the 

 spikelet; second glume shorter than the sterile lemma, both 3-nerved and under a lens minutely 

 bullate-rugose, often ruptured and breaking off as the fruit matures, as in P. trichoides; fruit 

 1.2 mm. long, 0.6 mm. wide. 



Typjs locality: Mexico. 



Distribution: Mexico and the West Indies to Paraguay. 



Illustration: Contr. U. S. Nat. Herb. 15: /. 126. 



90. Panicum Millegrana Poir. in Lam. Encyc. Suppl. 4: 278. 1816. 



Panicum hirsutum Lam. Encyc. 4: 741. F 1797. Not P. hirsutum Sw. 1797. 



Panicum patentissimum Desv.; Poir. in Lam. Encyc. Suppl. 4: 283. 1816. 



Panicum rugulosum Trin. Gram. Pan. 195. 1826. 



Panicum Sellowii Nees, Agrost. Bras. 153. 1829. 



Panicum Beyrichii Kunth, Rev. Gram. 231. 1830. 



Panicum lasianthum Trin. Ic. pi. 245. 1830. 



Panicum puberulum Trin. Mem. Acad. St.-Petersb. VI. 3 2 : 277. 1834. 



Panicum dispersum Trin. Mem. Acad. St.-Petersb. VI. 3 2 : 282. 1834. 



Panicum pilosum leiogonum Rupr.; Galeotti, Bull. Acad. Brux. 9 2 : 239, hyponym. 1842. 



Panicum Sellowii longevaginatum Rupr.; Galeotti, Bull. Acad. Brux. 9 2 : 239, hyponym. 1842. 



Panicum V alenzuelanum A. Rich, in Sagra, Hist. Cuba 11: 304. 1850. 



Panicum probandum Steud. Syn. Gram. 76. 1854. 



Panicum r.ugulosum hirtiglume Griseb. Cat. PI. Cub. 233. 1866. 



Panicum rugulosum pubescens Doell, in Mart. Fl. Bras. 2 2 : 259. 1877. 



Panicum rugulosum subvelutinum Doell, in Mart. Fl. Bras. 2 2 : 259. 1877. 



Plants perennial, spreading; culms sparingly branching, 0.5-1 meter high, ascending from 

 a decumbent base, softly pubescent to glabrous ; leaf -sheaths ciliate and with a dense ring of 

 pubescence at the summit, otherwise papillose-pilose to glabrous; ligule membranaceous, 

 scarcely 0.3 mm. long; blades ascending or spreading, thin, ovate-lanceolate, 4-15 cm. long, 



