Assertion: spinach's leaf | /r/CapableOf | develop purple pigment
Facets:
Source sentences:
text: The stem of the Basella alba is green with green leaves and the stem of the cultivar Basella alba 'Rubra' is reddish-purple; the leaves form green and as the plant reaches maturity, older leaves will develop a purple pigment starting at the base of the leaf and work towards the end.