290 



Bulletin No. 205 



[March, 



Paspalum stramineum Nash 

 Straw-colored Paspalum (Figs. 38 and 49) 



Culms often spreading or almost flat on the ground, smooth, 8 to 

 24 inches long; leaves yellowish green or straw color; sheaths smooth* 

 and glabrous except on the margin, where there is a fringe of short 

 hairs ; blades rather firm, ciliate on the margin, at least 10 mm. wide, 

 some very fine hairs on the upper surface, smooth and glabrous on 

 the under surface ; spikelets in pairs, yellow or almost white, usually 

 smooth, almost circular, very thick, 2 to 2.2 mm. long. 



This species is found in sandy places and is easily distinguished 

 by the pale color of leaves and spikelets. 



CASS CO. Beardstown, McDonald iu 1900. JO daviess co. Sandy prairie 

 near Mississippi river, Pcpoon 399. kankakee co. Kankakee, Uill, Aug., 1872; 

 Altorf, Hill, Aug., 1872. wabash co. Mt. Carmel, Waite, Aug., 1887, 



Figs. 45-50. — 45, P. longipilum, spikelet; 46, P. muhlenhergii, spikelets, 47, 

 P. repens, spikelets; 48, P. setaceiim, spikelets; 49, P. stramineum, spikelets; 

 50, P. supinum, spikelets 



Paspalum supinum Bosc. 



(Fig. 50) 



Culms spreading or lying flat on the ground, 2 to 3 feet long, 

 smooth; sheaths and blades conspicuously pubescent; blades long, 

 usually 1 foot or more, 5 to 15 mm. wide; spikelets in pairs, smooth, 

 oval, about 2 mm. long. 



This species closely resembles P. husliii in the "fuzzy" appearance 

 of the leaves, but is distinguished by the glabrous spikelets. In P. 

 husliii the culms are erect, but never in P. supinum. 



mason CO. Manito, Wilcox 56. union co. Anna, Seymour, Aug., 1880. 

 WABASH CO. Mt. Carmel, Patterson in 1877. 



9. PANICUM L. 



This genus belongs typically to warm climates and includes a very 

 large number of species, of which thirty-six have been found in Illi- 

 nois. A few of these are weeds, but the majority of them are of no 

 economic importance. Most of the species are perennials, but a few 

 are annuals, and among the annuals are found the species which are 

 common weeds. The inflorescence usually consists of many-flowered 

 panicles. The spikelets have two glumes and a sterile lemma, which 



