HITCHCOCK — REVISIONS OF NORTH AMERICAN GRASSES. 165 



5. Ch.aetoch.loa lutescens (Weigel) Stuntz. 



Panicum lutescens Weigel, Obs, Bot. 20. 1772. Described from Pomnierania, 

 Germany. 



Panicum glaucum var. flavescens Ell. Bot. S. C. & Ga. 1: 113. 1816. "Everywhere 

 except in inundated lands," probably in the vicinity of Charleston, South Carolina. 

 Merrill, 1 who examined the specimen in the Elliott Herbarium, states that this is a 

 yellow-awned form of Chaetochloa glauca [C. lutescens]. 



Panicum compressum Balb.; Steud. Nom. Bot. ed. 2. 2: 254. 1841, as synonym of 

 Panicum glaucum. The type, from Santo Domingo, collected by Bertero, is Chae- 

 tochloa lutescens. In the Krug and Urban Herbarium there is a piece of the type, sent 

 by Balbis to Sprengel. 3G»,"S£, [Q /<d_ 



Chaetochloa lutescens Stuntz, U. S. Dept. Agr. Bur. PI. Ind. Inv. Seeds 31: 83. 191 2 . 

 Based on Panicum lutescens Weigel. 



Setaria lutescens Hubbard, Rhodora 18: 232. 1916. Based on Panicum lutescens 

 Weigel. 



This species has been commonly known as Panicum glaucum, Setaria glauca, and 

 Chaetochloa glauca. Stuntz pointed out 2 that the name Panicum glaucum L. should 

 apply to the species usually known as Pennisetum americanum (L.) Schum., Pennisetum 

 typhoideum L. Rich., or Penicillaria spicata Willd., commonly called in the United 

 States pearl millet. Panicum glaucum L. 3 is based on a description taken from 

 Linnaeus 's Flora Zeylanica, which refers to the species of Pennisetum mentioned. 

 Linnaeus, in the Species Plantarum, describes two varieties, and y. Variety /3 is 

 later separated under the name Panicum viride L. 4 Variety y, as shown in a previous 

 paper, 5 is based on Clayton's no. 579 from Virginia, which is the same as Panicum 

 lutescens Weigel, that is, what has usually been called Panicum glaucum. In the 

 Systema 4 Linnaeus describes P. glaucum, using the words found in the description 

 taken from the Flora Zeylanica, but adding "Seminibus undulato-rugosis", and 

 cites "Sp. pi. n. 2 y." He has here apparently attached the name glaucum, to what 

 he had previously called glaucum var. y, that is, to P. glaucum in the subse- 

 quent sense. In the second edition of the Species Plantarum, Linnaeus uses the 

 emended diagnosis from the Systema, citing "Fl. zeyl. 44," and adds the citation 

 from Gronovius, giving the habitat as "Indiis & Italia." The descriptive note 

 appended includes the statement "Setae in spica longitudine flosculorum," which 

 applies to pearl millet, and "semina striis undulatis notata," which applies to Panicum 

 lutescens, thus indicating that he confused the two species, which are very unlike in 

 appearance. Probably Linnaeus was not familiar with either species and was 

 attempting to reconcile descriptions. 



The following synonyms are based on Panicum glaucum, L. as to name but refer to 

 Chaetochloa lutescens as to plant. No attempt has been made to include synonymy 

 from floras of the Old World. 



Pennisetum glaucum R. Br. Prod. Fl. Nov. Holl. 1 : 195. 1810. 



Setaria glauca Beauv. Ess. Agrost. 51, 178. 1812. 



Chamaeraphis glauca Kuntze, Rev. Gen. PL 2: 767. 1891. 



Ixophorus glaucus Nash, Bull. Torrey Club 22: 423. 1895. 



Chaetochloa glauca Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 4: 39. 1897. 



1 U. S. Dept. Agr. Div. Agrost. Circ. 29: 3. 1901. 



2 Loc. cit. 



3 Sp. PL 56. 1753. 



4 Syst. Nat. ed. 10. 2: 870. 1759. 



5 Hitchcock, Types of American Grasses, Contr. U. S. Nat. Herb. 12: 117. 1908. 



