206 Zanthorhiza apiifolia, 
CECONOMICAL USES. 
The yellow juice of this plant imparts a drab colour to woollen 
cloth, and a fine yellow to silk; neither cotton nor linen, however, 
imbibes any of it. With a proper mordant, it would in all probability 
be a valuable native dye. The infusion in hot water is very yellow. 
The watery extract of the grated roots mixed with alum, and 
added to Prussian blue, was used by Mr. John Bartram, for colouring 
plants and the green plumage of birds. This mixture is said to have 
produced a more lively colour than the mixture of Prussian blue and 
Gamboge, and stands well in the shade, but acquires a dull olive 
colour on exposure to heat ora strong light. 
TABLE XLVI. 
Represents a flowering twig of Zanthorhiza apiifolia, of its natural 
size, drawn from a specimen taken from Bartram’s Gar- 
den, Kingsess, 
