ON PLANTS PRODUCING DOUBLE FLOWERS. 187 
C. Polygonatum, Linn. Europ. Sibiria. 
Fritillaria Meleagris, Zinn. Europa. 
F. imperialis, Linn. Persia, Europ. 
Lilium Martagon, Linn. Europa. 
candidum, Linn. Syria, Persia. 
Hyacinthus orientalis, Linn. Oriens, Gall. austr. 
Polianthes tuberosa, Linz. Ind. orient. et occ. 
Hemerocallis disticha, Dom. Nepalia, Japonia. 
H. fulva, Linn. Europ. austr. 
Colchicacee. 
Colchicum autumnale, Linn. Europa. 
. Butomee. 
Sagittaria latifolia, Willd. Amer. sept. 
S. sagittifolia, Linn. Europ., Asia, Amer. 
Commelynee. 
Tradescantia Virginica, Zinn. Amer. bor. 
Commelyna alba, Hort. (Dr. Masters D 
Melanthacee. 
Tofieldia calyculata, Wahl. Europa. 
CORRESPONDENCE. 
Laws of Nomenclature. 
With other members of the British Association, I have received a reprint of 
the rules of Nomenclature drawn up by Mr. Strickland and others, and printed 
in the report of the twelfth meeting of the Association (1842), accompanied 
with a request to — them carefully, and to communicate any suggestions 
I can cate repeat a ei I made when the rules were under the con- 
sideration of the Committee of the Natural History Section at Mane ^ , 
viz. that therules be not adopted until they have been compared with i 
* Philosophia Botanica, Fabricius's * Philosophia Entomo logica, Illeger's Pro- 
dromus, and De Candolle’s ‘Théorie Élémentaire; and that when. they are 
