490 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



TENERA. 



Second glume and sterile lemma exceeding the fruit; spikelets 



pointed 44. P. tenerum. 



Second glume and sterile lemma not exceeding tlie fruit; spikelets 

 rather blunt. 



Pedicels bearing long stiff erect hairs at the summit 46. P. caricoides. 



Pedicels not hairy. 



Spikelets attenuate at base, about 2 mm. long; leaves more 



or less pilose 45. P. stenodoides. 



Spikelets not attenuate at base, about 1.5 mm. long; leaves 



glabrous 47. P. stenodes. 



44. Panicum tenerum Beyr. 



Panicum tenerum Beyr. in Trin. Mem. Acad. St. Petersb. VI. Sci. Nat. 1: 341. 



1834; Contr. U. S. Nat. Herb. 15: 97. 



\lW-Lv.-i '"'■■" 



...J ! 



ix 





4 





1910. 



DISTRIBUTION. 



Fig. 61.— Distribution of P. tenerum. 



Margins of sandy swamps and ponds 

 and in wet places in sandy woods, 

 southeastern United States, Cuba, and 

 Porto Pico. The type specimen from 

 Georgia. 



Cuba: Herradura. HitchcocJc 154, 

 Tracy 9080. Laguna Jovero, 

 Shafer 10750. Laguna Los Indios, Shafer 10807. Pinar del Rio, Wright 3870 

 in part. 

 Porto Rico: Campo Alegre, Chase 6617. 



45. Pardcuia stenodoides Hubbard. 



Panicum stenodoides Hubbard, Proc. Amer. Acad. 49: 497. 1913. "Type (in the 



Gray Herb.) and only specimen seen, low pine ridge, Ycacos Lagoon, March 5, 1907, 



M. E. Peck, no. 681." A portion of the type in Hubbard's herbarium has been 



examined. 



description. 



Plants perennial in dense tufts; culms erect,, slender and wiiy, glabrous or sparsely 

 pilose below the glabrous nodes, 20 to 40 cm. liigh, producing from the upper nodes 

 slender leafless panicle-bearing branches; sheaths papillose 

 or more or less papillose-pilose, the lowermost bladeless, 

 glabroxis, in age fibrous; ligule membranaceous, about 0.3 

 mm. long; blades erect, fiat at base, involute toward the 

 apex, 3 to 8 cm. long, 1 to 2 mm. wide, more or less papil- 

 lose or papillose-pilose, at least on the upper surface, some- 

 times glabrous; panicles short-exserted, usually exceeded 

 by the uppermost blade, about 1 cm. long, narrow, beaiing 

 3 to 7 spikelets on appressed scabrous pedicels, rarely a few 

 delicate hairs at the apex of the pedicels; spikelets 2 to 2.1 

 mm. long, 0.9 mm. wide, turgid, attenuate at base, glab- 

 rous; first glume about half as long as the spikelet; second glume and sterile lemma 

 subequal, barely covering the fruit, strongly nerved; fruit 1.7 mm. long, 0.8 mm. wide. 



Fig. 62.— p. stenodoides. From 

 type specimen. 



