From these experiments the upper surface of the leaf appeared to be the immediate organ of respiration, because the coloured fluid was carried to the extremities of the leaf by vessels most conspicuous on the upper surface, and there changed into a milky fluid, which is the blood of the plant, and then returned by concomitant veins on the under surface, which were seen to ooze when divided with scissars, and which in Picris, particularly render the under surface of the leaves greatly whiter than the upper one.    From Wordnik.com.  [The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation] Reference

Picris cyanocarpa, Boiss.    From Wordnik.com.  [The Land of Midian — Volume 2] Reference

Picris.    From Wordnik.com.  [Allgemeines Polyglotten-Lexicon der Naturgeschichte mit erklaerenden Anmerkungen] Reference

Picris, 179.    From Wordnik.com.  [Prodromus stirpium in horto ad Chapel Allerton vigentium] Reference

Picris, conf.    From Wordnik.com.  [The Land of Midian — Volume 2] Reference