82 BOTANICAL GAZETTE [JANUARY 
These are such common weeds everywhere that their appear- 
ance causes no surprise. Nevertheless it would be interesting to 
know how they came in. Avena, of course, and perhaps others 
were brought by horses. 
Turning to the hillside, we find 25 species? which are not yet 
represented on the new ground below. A few of these deserve 
notice. For example, a part of the hill is literally covered with 
ae iA 
Fic. 1.—A wide level shelf for the track 
Gerardia pedicularia, both rosettes and flowering plants. Why did 
none of these survive transplanting? Perhaps their parasitic habits 
are partly responsible. If so, the plant must be an_ obligate 
parasite, even if only hemiparasitic. Deschampsia flexuosa is much 
more plentiful on the hillside than Andropogon, but none of It 
? The plants found on the hillside but not below are Deschampsia flexuosa, Carex 
(2 spp.), Corylus americana, Quercus stellata, Amelanchier em ae 
perennis, Linum virginianum, Acer rubrum, Psedera quinquefolia, Hyperic 
noides, Lechea villosa, L. intermedia, Cornus sp., Chimaphila m lala eo 
sacia baccata, Verbascum Thapsus, Gerardia pedicularia, G. flava Chry sopsis mariana, 
Solidago bicolor, Antennaria neglecta, Erechtites hieracifolia, Hieracium ven0osu™, 
and H. scabrum 
