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96 VINES 
as high-as twenty feet, bears single pink flowers 
all summer. It needs protection with a good, 
heavy winter mulch in north temperate lati- 
tudes. There is also a double variety, equally 
as good in other particulars. For covering sand 
banks and steep grades with poor, gravelly 
soil, the best plant is C. villosa, a pretty little 
trailer with creamy-yellow flowers, all summer. 
_Other bindweeds, which can be used as bank 
covers, make good rockery plants, and which do 
better in dry soils, are the Rutland Beauty (C. 
sepium), with variable flowers of white and rose 
colour, and C. occidentalis. The latter is a white 
and pink variety, a little more upright than the 
former, which is a real trailer. 
A plant which cannot be used for the general 
purpose to which vines are generally applied, 
but which is good for covering fences and other 
objects where a heavy screen is not desired, is 
the butterfly pea (Centrosema Virginianum), 
a small, thin-leaved vine, with clusters of violet- 
coloured flowers produced all summer. It is 
also a good plant for sandy soils. It would be 
more planted if it were better known, as the small 
clusters of pea-like flowers are always attractive. 
There is a white-flowered variety, which is even 
more rare than the blue type. 
