HITCHCOCK — REVISIONS OF NORTH AMERICAN GRASSES. 181 



1826. Based on Setaria scandens Schrad. 

 151. 1833. Based on Panicum scandens 



Based on Panicum 



Panicum scandens Trin. Gram. Pan. 166. 



Panicum trinii Kunth, Enum. PL 1: 

 Trin. 



Panicum, scandens a vulgareDoell in Mart. Fl. Bras. 2 2 : 171. 187 

 scandens Trin. 



Panicum scandens y longisetum Doell in Mart. Fl. Bras. 2 2 : 171. 1877. One of the four 

 collections cited, Burchell 4510, from Sao Paulo, is in the National Herbarium. 



Chaetockloa scandens Scribn. in Donn. Smith, Enum. PL Guat. 5: 91. 1899. Based 

 on Setaria scandens Schrad. 



DESCRIPTION. 



Plants annual, much branched below, erect or soon geniculate-spreading; culms 

 slender, sometimes rooting at the lower nodes, as much as 80 cm. long, glabrous, some- 

 times appressed-pilose at the nodes, especially below the margin of the sheath; 

 sheaths glabrous or sparsely ap- 

 pressed-pilose, or the lowermost 

 densely pilose, the margin and col- 

 lar densely pilose; ligule densely 

 ciliate, less than 1 mm. long; 

 blades flat, linear-lanceolate, as 

 much as 10 cm. long and 1 cm. 

 wide, scabrous, especially on upper 

 surface, usually sparsely, some- 

 times densely pilose on both sur- 

 faces; panicles slender, erect, cyl- 

 indric, densely flowered, some 

 times slightly lobate or interrupted 

 especially at base, often purplish, 

 as much as 8 cm. long, mostly less 

 than 5 mm. thick, the axis softly 

 pubescent and also long-villous, 

 the scattered hairs of ten longer than 

 the spikelets; branches very short, 

 pubescent and sparsely villous like 

 the axis; clusters of bristles nearly 

 sessile, divided into 3 to 5 short 

 branchlets, each supporting a 

 spikelet and 1 to 3 bristles; bristles 

 somewhat flexuous but not becom- 

 ing implicate, 1 to 2 times as long 

 as the spikelets, antrorsely scabrous except near the tip, there more or less 

 retrorsely scabrous; spikelets about 1.5 mm. long, ovoid, turgid on the convex side; 

 first glume about half as long as the spikelet, very broad, enveloping the base of the 

 spikelet, 3-nerved; second glume nearly as long as the spikelet, 5-nerved; sterilelemma 

 as long as the spikelet or slightly exceeding the fertile lemma, 5-nerved, partly envel- 

 oping the fertile lemma, the first pair of nerves at the edges of the spikelet, the outer 

 pair on the convex side of the spikelet; fertile lemma transversely striate or weakly 

 rugose. 



Fig. 4i.— Chaetochloa scandens. From Hitchcock 9723, 

 Jamaica. 



DISTRIBUTION. 



Open ground, Guatemala to Paraguay; also Jamaica and Haiti, 

 cultivated soil. 



Guatemala: Finca Tres Aguas, Goll 80. 



Costa Rica: San Jose, Tonduz 765. San Juan, Tonduz 17555^ 

 Panama: Alhajuela, Pittier 3463. 



Often a weed in 



