138 Chase — Notes on Genera of Panicetz. TV. 



name Linnaeus first cites (as the third synonym) under Panicum dissec- 

 tum (Sp. PI. 57. 1753), but erroneously, the plate being an illustration of 

 a very different species from the type of P. dissectum in the Linnaean 

 Herbarium.* Linnaeus later (Sp. PI. ed. 2. 81. 1762) cites this phrase 

 name and plate under Paspalum virgatum and also (op. cit. 1483), 

 erroneously, under Andropogon fasciculatum. According to the Ameri- 

 can Code of Botanical Nomenclature (Canon 10) the publication of Digi- 

 tnria Heist, as a genus would depend upon the specific description [from 

 Sloane] "associable by citation with a previously published binomial 

 species. ' ' While this specific description is cited under Panicum dissectum 

 it is erroneously so; the species to which the description (as well as the 

 figure) applies has no " previously published binomial," and therefore in 

 the technical sense is not published. 



Sabsab Adans. Fam. 2 : 31, 599. 1763. No species are given. The tech- 

 nical publication of the name is based upon the citation of " Paspalum. 

 Lin." 



Cleachne Roland, in Uottb. Acta Lit. Univ. Hafn. 1:285. 1778. The 

 name ' ' Cleachne R." appears to be given as a synonym of Paspalum , three 

 unpublished names of the latter being mentioned without description. 



Ceresia Pers. Syn. PI. 1 : 85. 1805. A brief diagnosis is given and a 

 single species C. elegans Pers. (1. c. ) is cited. This name is based on 

 r Paspalum niembranaceum Lam. ill. gen. p. 177. t. 43. f. 2. Hab. in 

 Peru." The generic diagnosis appears to be taken from Lamarck's 

 specific description, but slightly rearranged. Lamarck's specimen has 

 net- been examined, but the description and figure indicate one of the 

 species related to Paspalum st el latum Humb. A Bonpl. and probably that 

 represented by Gardner's Plants of Brazil no. 4029 and Bang's Plantae 

 Bolivianae no. 1080. Lamarck's name is preoccupied by Walter's use of 

 ^P. membranaceum. Koeiner & Schultes (Syst. Veg. 2 : 290. 1817) give 

 P. elegans, based on Ceresia elegans Pers., as a synonym of P. mem- 

 branaceum Lam., hut this binomial also is preoccupied by P. elegans 

 Fliigge (Gram. Monog. 183. 1810); P. commersonii Zucc. (in Roem. 

 Collect. 122. 1809), which appears to refer to this species, is preoccupied 

 by Lamarck's use of the same name. It seems probable that this species 

 has somewhere received a name that will prove tenable, but as yet we 

 have not found it. Trinius and Doell use the name P. membranaceum 

 Lam . 



Reimaria Fliigge. Gram. Monog. 213. 1810. The "character essen- 

 tialis " given is as follows: " Calix unighunis, unifloris, valvae planiori 

 appressus. Corolla plano-convexa, bivalvis," to which is added the 

 observation " Paspalo arrinis, at satis superque differt calice constanter 

 uniglumi nee biglumi." It will be seen that the absence of both glumes 

 is the only character given to differentiate this proposed genus from 

 Paspalum. Three species are included, R. Candida Humb. & Bonpl., 

 R. elegans and R. acuta, all here described for the first time. The first 



* For an account of the types of American grasses described by Linnaeus see Hitch- 

 cock (Contr. Nat. Herb. 12 : 114-127. 1908). 



