| CODE OF BOTANICAL NOMENCLATURE 257 
debet, tum nomen antea commune manebit vulgatissimae 
| et officinali plantae.”’ \ 
EXAMPLES.—/oa L. Sp. Pl. 67, is typified by P. pratensis L., the 
commonest of its original species ; Jo//ugo L. Sp. Pl. 89, is typified by AZ. 
| verticillata L., the commonest of its original species 
Section V. Rejection of Names. 
| Canon 16. A name is rejected when preoccupied (homonym). 
(2) A specific or subspecific name is a homonym when it has 
| been published for another species under the same ge- 
neric name. Two subspecies of the same genus shall 
. not retain the same name. 
_ ExaMPLes.—Acer saccharinum Wang. Amer, 36. p/. 2 i ie mO 
(1787), is a homonym of Acer saccharinum L. Sp. Pl. 1055 (1753); Vac- 
| cinium myrtilloides Hook. Fl. Bor. Am. 2: 32 (1834), is a prog of 
Vaccinium myrtilloides Michx. Fl. Bor, Am. 1: 234 (1803), and is 
rejected whether the latter species is regarded as distinct or not; Juncus 
nodosus megacephalus Torr. Fl. N. Y. 2: 326 (1843), is a homonym of 
Juncus megacephalus M. A. Curtis, Boston Jour. Nat. Hist. 1 : 132 (1835) ; 
oo iia ( Walt.) Britton, Mem. Torrey Club, 5 : 31 A ica ae is a 
hom f Chrysopsis pilosa Nutt. Jour. Acad. Nat. Sci. Phila. 7: 66 
iia,» ne is to be rejected, notwithstanding the fact that Ergot 
Pilosum Walt. was published in 1788; Carex scoparia moniliformis 
Tuckerm. Enum. Meth. Car. 17 (1843), a Carex straminea moniliformis 
Tuckerm, /oc. ci#., can not both be maintained. 
() A generic or subgeneric name is a homonym when previ- 
ously published, or proposed in print, for another genus. 
EXAMPLES.— Jorreya Arn. Ann, Nat. Hist. 1: 130 (1838), isa homo- 
nym of Zorreya Raf. Am. Mo, Ma ag. 3: 356 (1818), < Torreya Raf. 
Jour. Phys. 89 : 105 (1819), of Ss Anat Neue Entdeck. 2: 121 
(1821), and of Zorreya Eat. Man. ed. 5, 420 (1829); Aivularia Ag. 
Syn. Alg. Scand. xxxviii (1817), is a Ae of Rivularia Roth, Cat. 
I : 212 (1797); esaea Lamour. Nouv. Bull. Soc. Philom. 3: 185 (1812), 
is a homonym of Mesaea Commers. ex Juss. Gen. Pl. 332 (1789); Bul/i- 
arda DC, Bull. Soc. Philom. 349: 1 (1801), is a homonym of Budliarda 
Neck. Elem. 2: 321 (1790). 
(¢) Similar names are to be treated as homonyms only when 
a 
aes 
they are mere variations in the spelling of the same word ; 
or in the case of specific and subspecific names, when they 
i differ iad in — or genitive termination. 
t EXAMPLES. — Penicil/us and Penicillium, Callitriche and Calothrix, 
Nemastylis ake Nadie Pterigophyllum and Pteridophyllum, may 
be maintained ; Cyathophora and Cyathophorum, Asterocarpus and Astro- 
carpus can not be maintained. Greenei and Greeni, named for different 
