494 
4 
4 
4 
"a 
are the common fruits: apple, pear, cherry and plum. In special 
favored localities peaches are grown. 
Sources of information. In preparing the present paper the 
author has used his own notes, made in many years of field-— i 
study, as a basis for the list, but has added a number of species | 
from the ,Flora of Colorado” ') of which a thorough examination 1 
has been made. All but a half dozen of the plants here listed 
are reported by Ryppere as occurring in the state and nearly 
all of these half dozen have been recorded by other writers. — 
The present paper, therefore, adds no species to the known flora” 
of Colorado but gives information not previously recorded as tal 
abundance and occurrence. 
The introduction of European plants into Colorado. Tn Colorado, 1 
as in other inland localities, plants become introduced chiefly 
through their seeds being mixed with seed-grain, lawn- -gTass 
and garden-seeds, or in stock food, while a few escape from 
cultivation. The list of plants here given embraces 95 species q 
and of this number 26 may be considered as garden-escapes. — 
Perhaps some of the others may have been introduced purposely — 
into isolated localities, but there can be no certainty of this. 
Most of the species have come to Colorado from the eastern 
United States and not directly from Europe. However, alfalfa 
(Medicago sativa) reached Colorado from the south- west, having 
been introduced into California at an early date by the Spanish 
fathers. New introductions are occurring from time to time 
chiefly along lines of railway. In railroad-yards, especially wher 
cattle and sheep are loaded, and along new embankments or wher 
street grading is being done, there is opportunity for introduced 
plants to gain a foothold. Away from railway-lines these plant 
follow wagon-roads, thinning out very rapidly at a distance 
from main lines of travel. The older-settled parts of the state. 
even when comparatively remote from railways, show an abut- 
dance of roadside and pasture-weeds. The total number of in 
1) Ryppere, P. A.: Flora of Colorado, Bull. 100, Colo. Agr. Coll, Exper. Sta: 
Ft. Collins, Colorado, 1906. 
