472 INTERNATIONAL GARDEN CLUB 
4 
LITERATURE RELATING TO DROPPERS 
Biopcett, F. H. 1900 Vegetative mruer: and multiplication in Erythronium:- 
ull. Torrey Bot. Club 27: 305-3 
Biopcett, F. H. 1901 A tulip witharunner. Torreya 1: 78-79, 
BiopcettT, F. H. 1909 The stem offshoot in Erythronium propullans, Gray. Johns 
Hopkins Univ. Circular, June, 1909. 
.- F. H. 1910 The origin and development of bulbs in the genus Erythronium. 
t. Gaz. 50: 340-373. 
IrMIsH, nee tise Zur Morphologie der Monokotylischen Knollen—und Zweibelge- 
erlin 
wachse. 
IruisH, THILO er tidings zur vergleichende Morphologie der Pflanzen. Tulipa. 
Bot. Zeit. 21: 177-181 
Kwerr, E. B. The riddle of the Erythroniums. Vicks Ill. Monthly Mag. 20: 100-101. 
RAUNKIAER, CurRIsTIAN 1895-1899 De Danske Blomster planters Naturhistorie. Bd. 
I. Copenhagen 
RoBERTSON, AGNES 1906. The ‘droppers’ of Tulipa and Erythronium. Ann. Bot. 
429-440. 
New York BoTANICAL GARDEN 
