Camassia leichtlinii Semi-Plena.
This is the tallest of the camassias and the last to flower. The very tall, stiff stems, are densely covered with a succession of creamy-yellow star-shaped flowers that are semi-double. The flower for a long time and are perfect for the middle of a sunny border. Like all summer flowering bulbs the leaves are fading by the time the flowers appear so I plant them in the middle of the border. They are good poking up behind the leaves of daylilies (hemerocallis)
Height: 4'
Flowers: May - June