August Color Appears at the Washington Park Arboretum
(Part II)

August 25th, 2013 by Pat Chinn-Sloan
wpa_cuttings_8-19-13

Selected cuttings from the Washington Park Arboretum (August 19 – 25, 2013)

1)    Aralia elata (Japanese Angelica Tree)

  • Natural range: Japan, Korea, Russian Far East
  • Can be a tree more than 30 feet tall. Ours are multiple suckers from a spreading root system.
  • Located north of the Wilcox footbridge (40-3W).

2)   Bupleurum fruticosum

  • A dense, multi-stemmed shrub tolerant of exposure and poor soil.
  • Native to Southern Europe and the Mediterranean.
  • Located in our Rock Rose area west of the Sorbus Collection (21-3E).

3)   Kalopanax septemlobus

  • A member of the Aralia family (Araliaceae), it grows to 100 feet. Its lobed leaves might be mistaken for maple until the umbels of flowers appear in July and August.
  • Native to Japan, Korea, and the Russian Far East.
  • Our best is located west of Azalea Way in 15-1W.

4)   Poliothyrsis sinensis

  • Native to the Chinese province of Hupeh
  • Bears clusters of fragrant white flowers
  • Located south of the Woodland Garden near other so-called primitive trees: Trochodendron, Tetracentron, and Euptelia.

5)   Rosa sp. with Spiny Rose Gall

  • These galls are caused by a tiny wasp, probably Dipolepis bicolor, which lays its eggs in the rose’s leaves. The larvae live in the galls until the following spring.
  • This plant is located in 25-1E at the intersection of the Upper and Lower Trails.
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