One of my favourite spots in the garden right now is under the Acer saccharum in the North American bed of the Alpine Garden. Brent Hine, the curator of the garden, has assembled and tended a fine collection of spring-flowering plants, including this one and the Trillium albidum that I posted a few days ago. The name "Plena" is oft-used in horticultural circles to denote a double-flowered selection (one that has twice the number of petals and perhaps other floral parts).