We’ll do a bit of a rewrite for yesterday’s entry due to the misidentification, but that might not show up until next week. In the meantime, here’s the next in the nastic plant movement series by Taisha. She writes:
Today’s photo is of Oxalis triangularis subsp. papilionacea or the purpleleaf false shamrock. Another common name is the love plant. This photograph was taken by Anne Elliott (aka annkelliott@Flickr), and shared via the Botany Photo of the Day Flickr Pool. Thanks Anne!
Oxalis triangularis subsp. papilionacea is native to rocky stream banks of Brazil. A recipient of the Royal Horticultural Society’s Award of Garden Merit, this attractive taxon with its striking pink flowers and red-burgundy-purple triangular-shaped leaves is often grown as a houseplant in temperate climates.
Purpleleaf false shamrock moves in response to changes in light, i.e., photonasty. When exposed to light, the leaves of Oxalis triangularis subsp. papilionacea fold out and upward. In response to darkness, the leaves will fold down and inward (timelapse video). The light-receptive part of the plant that receives the stimuli in this taxon is in the pulvinis (the section between the leaf and petiole) (see: Kang, JH. et al. 2009. Leaf movement by light condition in Oxalis triangularis. Hort. Environ. Biotechnol. 50(4):371-475).