The photographer and author today is Taisha. She writes:
While walking through the David C. Lam Asian Garden, I found some visual appeal in the blossoms of Iris wilsonii swaying on stems of different heights. In the Garden today, they are highlighted by brief flashes of early-summer sunshine on an otherwise cloudy day.
Iris wilsonii is a Siberian iris (series Sibericae), native to China (note that Siberian in this case is a botanical-horticultural grouping). In China, it is found at mid- to high elevations in alpine meadows, streamsides and forest margins of the western part of the country. Iris wilsonii was introduced to Western cultivation by Ernest Henry Wilson around 1907. Irises in the Sibericae series can often be easily confused with each other, in part because they readily hybridize.
According to A Guide to the Species Irises: Their Identification and Cultivation, this herbaceous perennial grows to 60-70cm in height with grey-green leaves of about the same length as the hollow stem. The unbranched stem supports fragrant flowers in early summer, often of pale yellow with purple-brown stripes and spots. The fruit of this species is an ellipsoidal capsule that is borne on long pedicels.