1) Cytisus x praecox ’Luteus’ Warminster Broom
- This broom is a hybrid of C. multiflorus and C. purgans and is located on Arboretum Drive in the Legume Collection.
- Many of the brooms are blooming now or soon to bloom, including the pineapple broom, Argyrocytisus battandieri, whose fragrance earned it its common name.
2) Erica arborea var. alpina Tree Heath
- While non-alpine tree heath can reach heights in excess of 20 feet, the alpine variety is the “short” one, reaching only 10 to 15 feet.
- Alpine tree heath has white flowers versus light-gray, and the scent is reminiscent of honey.
3) Hydrangea luteovenosa Sweet Hydrangea
- In full bloom now, this semi-trailing Hydrangea is located on the Ridgetop Trail in Rhododendron Glen.
- Though widely distributed in western Japan, this species of Hydrangea is critically endangered in Korea.
4) Rhododendron ‘Snow Lady’ x Rhododendron degronianum ssp yakushimanum
- Hybrids are often created to blend two or more outstanding traits from two separate taxa into one single plant, e.g. flower color and leaf indumentum.
- There are several areas in the Washington Park Arboretum, including Azalea Way, Loderi Valley, Rhododendron Glen and the Puget Sound Rhododendron Hybridizers bed, showcasing many hundreds of hybrids of Rhododendron.
5) Syringa reflexa Nodding Lilac
- The buds of Syringa reflexa start out a rosy–red before opening to pink and eventually fading to almost white.
- The specific epithet “reflexa” refers to the nodding habit of the flower heads.
- Lilacs are located throughout the Washington Park Arboretum, though many are found just south of the Woodland Garden along Azalea Way.