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Fre. 3; 
Area including 100 square meters, showing position of perennials (marked by a cross with 
initials of name) and alfilaria (marked by dots), February 21, 1906. 
Ac, Acacia constricta; Bh, Bigelowia hartwegwi; Ce, Calliandra eriophylla; Ds, Delphiniwim sca po- 
sum; Fd, Franseria deltoidea; Lb, Lycium berlandieri; Ov, Opuntia versicolor; Pm, Parkin- 
sonia microphylla; P, Philibertia sp.; Sp, Spheraicea pedata, 
As indicated by plate 22, 13 small patches were located, all of them at no 
great distance from the Laboratory building. Very probably a few other 
spots were occupied at that time by this grass, but if so, the essential 
fact remains that the points mapped include all that were readily found 
and represent, with substantial truthfulness, the very early stage of 
invasion then observed. As in the case of Erodiwm cicutarium, details 
of distribution are included in the Laboratory records for the purpose 
of reference in further observation of the invasion of this species. 
Invasion of many other species on Tumamoc Hill and in the adjacent 
valleys has taken place and is still going on. On the flood-plain near 
the river are extensive areas so covered with Xanthiwm canadense and 
Malva parviflora as to nearly obliterate all trace of the original vegetation. 
Along paths in the vicinity of the Laboratory Monolepis nuttalliana has 
