LIBRARY 
NEW YORK 
BOTANICAL 
GARDEN 
The Structure and Parasitism of Aphyllon 
Uniflorum, Gray. 
(WITH PLATES XIII-XV.) 
By Ame.tiA C. Situ, B.S. 
Aphyllon untflorum, or the Naked Broom-rape, belongs to 
the large parasitic order of the Orobanchacee, and is by some 
included in the genus Orodanche. It is typically a North 
American species, and is a pure parasite, being without 
chlorophyl. The present study was undertaken at the sug- 
gestion of Professor Macfarlane, and was carried out under his 
direction. All of my material has been collected from one 
very limited locality at Glenolden, Pennsylvania, where it 
grows luxuriantly. It appears toward the end of May, when. 
Aster plants are about nine inches high, and by the end of 
June the seeds are matured and the plant is withering. I have 
invariably found it parasitic onthe roots of Aster corymbosum. 
Chatin states that it is parasitic on Solidago and other Synan- 
there, while Beck gives the following list of host-plants : 
Species of Artemisia, species of Solidago, Sedum stenopeta- 
lum (!) By carefully cutting out and lifting a large sod con- 
taining several Asters and a clump of <Affhyllon, and then 
washing away the soil until the roots were exposed, I was able. 
to trace the root-connections with certainty. 
METHODs. 
Some of my material was killed in saturated aqueous solu- 
tion of corrosive sublimate, a smaller quantity in absolute 
alcohol, and a great deal of it was simply preserved by plac- 
ing it at once in 70 per cent alcohol. For general structure, 
all of the above methods gave equally good results. For 
II! 
