Rules of Nomenclature 61 



Aust. Bull. Torrey Club 6 : 19 (1875) 's a homonym of Radtda 

 spicata Mitt. Bonplandia 10 : 19 (1862) ; Acer saccharimtm Wang." 

 Amer. 2^. pL 2. /. 26 (1787) is a homonym oi Acer saccharinum 

 L. Sp. PI. 1055 (1753) J Vaccinium tHyriilioides Hook. Fl. Bon- 

 Am. 2 : 32 (1834) is a homonym of Vaccuihim myriilloides Michx. 

 t\, Bor.-Am. i : 234 (1803) and is rejected whether the latter spec- 

 ies is regarded as distinct or not ; Chrysopsis pilosa (Walt. ) Britton, 

 Mem. Torrey Club 5; 316 (1894), is a homonym of Chrysopsis 

 pilosa Nutt. Jour. Acad. Nat. Sci. Phila. 7: 66 (1834) and is to 

 be rejected notwithstanding the fact that Eri^e^-on piios7/m Walt. 

 was published in 178S; Brasenia aniiqua Daws. Trans. Roy. Sec. 

 Canada 3*; 15 (1885) is a homonym of Brasenia antiqua Newb, 

 Vroc. U. S. Nat. Mus. 5: 514 (1883), 



{b) A generic name is a homonym when previously pub- 

 lished for another genus. 



Examples. — Rivularia Ag, Syn. Alg. Scand. xxxviii 

 (1817) is a homonym of ^/z^///^;'m Roth, Cat. Bot. i : 212 (1797) ; 

 Sphaerella Ces. & DeN. Schem. Sfer. Ital. 62 (1863) is a homo- 

 nym of Sphaerella Sommerf. Mag. Naturvid. 4: 249 (1824) ; Tor- 

 reya Arn. Ann, Nat. Hist, i : 130 (1838) is a homonym of Tor- 

 reya Raf, Am. Mo, Mag. 3 : 356 (18 18), of Torreya Raf. Jour. 

 Phys. 89 : 105 (1819), of Torreya Sprang. Neue Entdeck. 2 : 

 121 (1821), and of Torreya Eat. Man. ed. 5, 420 (1829), 



(r) Similar names are to be treated as homonyms only 



when they are mere variations in the speUing of the 

 same word ; or in the case of specific and subspe- 

 cific names, when they differ only in adjective or 

 genitive termination. 



Examples, — Penicillus and PenicilUum^ Callitriche and 

 Calotkrixy Pierigophyllum and Pteridophylhimy maybe maintained ; 



Cyaihophora and 



"pu 



can not be maintained. Greenei and Greenii^ named for different 

 persons, Greene and Green, may be maintained in the same genus ; 

 virginicus^ virginianus^ and virginiensis^ oreganus and oregonensis, 

 Ilookeri and Ilookerianus^ cannot be maintained in the same genus. 



2^. When there is an older valid name based on another 



member of the same group (metonym). 



Examples. — Ckauvinia Bory, Voy. Coquille, Bot, Crypt. 204 

 (1828), is typified ty Ckauvinia paspaloides'&ory , ^ui. Caulerpa Lamour. 

 Tour, de Bot. 2: 141 {^'^<^9) 's typified by Caulerpa prolifera (Forsk.) 

 Lamour., consequently, if these species are regarded as congeneric, the 

 name Ckauvinia is rejected; Boletopsis P. Henn. Nat. Pflanzenf, i^** : 

 194 (1899) cannot stand as a genus to include a section bearing the name 

 Boletinus Kalchb., the latter having been established as a:genus in 1877; 

 Meibomia Heist, ex Adans. Fam. PL 2 : 5^9 {}l^l) is based on Hedysa^ 

 rum canadense L. Sp. PI. 748, and Desmodium Desv. Jour, de Bot IL 

 i: I22(l8i3)is typified by Iledysarum asperum Poir* EncycL SuppL 



