HITCHCOCK REVISIONS OF NORTH AMERICAN GRASSES. 187 



14. Chaetochloa viridis (L.) Scribn. 



Panicum viride L. Syst. Nat. ed. 10. 2: 870. 1759. No locality is given. A refer- 

 ence is made to " Spec. pi. n. 2. /3." Panicum number 2 in the Species Plantarum is 

 P. glaucum. No locality is given for variety j3, but this is based on a citation from 

 Scheuchzer, 1 describing a plant from Europe. 



Setaria viridis Beauv. Ess. Agrost. 51, 178. 1812. Panicum viride is included as a 

 species of Setaria, and Setaria viridis is given in the index. 



Pennisctum viride R. Br.; Roem. & Schult. Syst. Veg. 2: 489. 1817, as synonym of 

 Setaria viridis. 2 



Setaria weinmanni Roem. & Schult. Syst. Veg. 2: 490. 1817. Bohemia. 



Panicum viride /3 brevisetum Doell, 

 Rhein. Fl. 128. 1843. A form with 

 bristles only a little longer than the 

 spikelets. 



Panicum italicum var. viride Koem. 

 in Koem. & Wern. Handb. Getreid. 

 1: 277. 1885. Based on Panicum 

 viride L. 



Chamaeraphis italica var. viridis 

 Kuntze, Rev. Gen. PI. 2: 767. 1891. 

 Based on Panicum viride L. 



Chamaeraphis viridis Millsp. W. Va. 

 Agr.Exp. Sta. Bull. [Fl. W. Va.] 2: 466. 

 1892. Based on Panicum viride L. 



Ixophorus viridis Nash, Bull. Torrey 

 Club 22: 423. 1895. Based on Panicum 

 viride L. 



Chaetochloa viridis Scribn. U. S. Dept. 

 Agr. Div. Agrost. Bull. 4: 39. 1897. 

 Based on Panicum viride L. 



Setaria viridis var. weinmanni Borbas, 

 Math. Termesz. Kozlem. 15:310. 1878, 

 an unverified citation; Brand in Koch, 

 Svn. Deutsch. Sehweiz. Fl. ed. 3. 3: 2690. 1905. Based on Setaria weinmanni Roem. 

 & Schult. "RKocW^ *;*/* "?° 6 - 



Setaria viridis var. breviseta Hitchc. in A, - Gray, Man. ed. 7. 119. 1908 . Based on 

 Panicum viride var. brevisetum Doell. 



Several other synonyms are given in European botanies. Hubbard has given an 

 extensive bibliography. 3 



DESCRIPTION. 



Plants annual, usually branched at base, sometimes geniculate-spreading; culms 

 smooth, scabrous below the panicle, usually 20 to 40 cm. tall, sometimes as much as 

 1 meter; sheaths smooth, or scabrous toward the summit, ciliate on the margin and 

 sometimes a little on the collar; ligule very short, densely ciliate; blades flat, linear- 

 lanceolate, straight (not twisted), scabrous especially on the upper surface, usually 

 less than 15 cm. long, commonly less than 1 cm. wide, sometimes as much as 15 mm. 

 wide; panicle erect or somewhat nodding, densely flowered, green or purple, 

 cylindric but tapering a little at the summit (the smaller ones ovate), rarely as much 

 as 10 cm. long, usually less than 7 cm., commonly 5 to 8 mm. thick (excluding bristles), 



Fig. 48.— Chaetochloa 



';iridis. From Thompson 129, 

 Kansas. 



1 Scheuchz. Agrost, Hist. 46. 1719. 



2 See note on Pennisetum verticillatum, p. 178. 



3 Amer. Journ. Bot. 2: 175. 1915. 

 168000—20 6 



