HITCHCOCK AND CHASE NORTH AMEEICAN PANICUM. 



125 



^ 68. Panicum virgultoriim Hack..r=^ (j . /9/^/C<yiy^^^^^^''y:i^''''^''*■^^ 



Panicum virgultorum Hack. Oesterr. Bot. Zeitschr. 51 : 369. 1901. 



"Costarica: in 

 virgultis ad La Verbena prope Alajuelito leg. Tonduz (Pittier et Dur. PI. costar. exs. 

 nr. 8829) et ad rivulos prope tres Rios (Pittier ibid. nr. 4326)." The type, Tonduz 

 8829, is in Hackel's herbarium. ''^ee. 



Tonduz « listed this species under the name "Panicum oblongum Hack." This 

 was a herbarium name at first applied by Hackel to Tonduz's no. 8829, as shown by 

 specimens in Hackel's herbarium and others distributed by Tonduz. 



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DESCRIPTION. 



Fig. 118. — P. virgultorum. 

 type specimen. 



From 



Plants perennial, ascending from a decumbent or sometimes a widely creeping 

 base, branching and rooting at the lower, geniculate nodes; culms slender, wiry, 0.4 

 to 1 meter or more long, compressed, glabrous or pubes- 

 cent below the nodes; nodes pubescent or glabrous; 

 sheaths often as long as the internodes, usually short- 

 ciliate, otherwise glabrous or the lowermost pubescent; 

 ligules membranaceous; blades 5 to 10 cm. long, 5 to 10 

 mm. wide, narrowly lanceolate, acuminate, narrowed to 

 the base, scabrous on the upper surface, smooth and 

 glossy beneath; panicles mostly long-exserted, 2.5 to 7 

 cm. long, half to two-thirds as wide, the 2 to 4 branches 

 ascending, compactly flowered except at the base, or the lower sometimes naked 

 one-third its length, the short branchlets and pedicels pubescent; spikelets 1.6 mm. 

 long, 0.9 mm. wide; first glume less than one-fourth the length of the spikelet; second 

 glume and sterile lemma equal, 5-nerved; fruit 1.5 mm. long, 0.8 mm. wide, oval, 

 smooth and shining but with sparse, long, appressed, silky hairs. 



DISTRIBUTION. 



Hedgerows and cultivated fields, Guatemala and Costa Rica. 

 Guatemala: Dept. Huehuetenango, Seler 2708. 

 Costa Rica: Alajuelita, Tonduz 8818, 8829. 





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Panicum schmitzli Hack. 



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Panicum schmitzii Hack. Ann. Naturhist. Hofm. Wien 17 : 254. 1902. No specimen 



nor locality is cited. The author states that the specimen was from Mexico and was 



sent him by Dr. Zahlbruckner for identification, having been communicated to the 



Hofmuseum by Schmitz, but that neither the name of 



the collector nor the date of collection was given. The 



type is in Hackel's herbarium. 



DESCRIPTION. 



Plants apparently perennial ascending, or erect from a 

 long-jointed, creeping base, rooting and branching from 

 Pj.qj^ the nodes of the decumbent portion, the suberect branches 

 20 to 45 cm. high, simple or nearly so; culms puberulent 

 at least below the puberulent nodes; sheaths short, puberu- 

 lent, at least toward the summit; ligules ciliate; blades 6 to 10 cm. long, 10 to 18 

 mm. wide, lanceolate, more or less falcate, narrowed to the rounded base, sparsely 

 papillose-hispid on the upper surface, glabrous or with a few scattered papillae or 

 hairs beneath; panicles rather short-exserted, 4 to 8 cm. long, the few subracemose 



Fig. 119.— p. schmitzii. 

 type specimen. 



oBuU. Herb. Boiss. 3:"450. 1895. 



