Malva rotundifolia L. 
499 
Trifolium repens I. 
Very common in plains area and foothill zone; less abun- 
dant in the montane zone. Escaped from cultivation in 
lawns and pastures. 
Medicago sativa L. 
Escaped from cultivation. Very common in plains area. 
Melilotus alba Desv. 
Plains area and foothill zone. Very common at about 5000 
feet altitude. 
Mellotus officinalis (L.) Lam. 
Plains area. 
Geraniaceae. 
Erodium cicutarium L. 
Plains area and foothill zone Locally abundant at about 
5000 feet altitude. 
Linaceae. 
Linum usitatissimum UL. 
- Plains area. Probably introduced in grain seed; is not grown 
in Colorado. 
Euphorbiaceae. 
Luphorbia cyparissias L. 
Escaped from cultivation. Locally present at about 5000 
feet altitude in the neighbourhood of dwellings. 
Rhamnaceae. 
— Rhamaus carthartica L. 
Escaped from cultivation along irrigating canals; local. 
Malvaceae. 
Very common in dooryards and pastures and along road- 
ways in plains area, foothill and montane zones, somewhat 
dwarfed at the higher-altitude stations. 
) Malva parviflora L. 
Plains area. 
_ Althaea rosea Cav. 
Sparingly escaped from cultivation; plains area. 
