Rhododendron campylocarpum subsp. coloxanthum
Common name: 
Coloxanthum Rhododendron
ro-do-DEN-dron kam-pi-lo-KAR-pum ka-loks-ANTH-um
Native to (or naturalized in) Oregon: 
  • Broadleaf evergreen shrub, 3 ft (0.9 m) high in 10 years.  Leaves simple, alternate, about 4-10 cm long, about half as wide, mostly elliptic or oblong-elliptic, apex rounded or obtuse, base truncate or slightly cordate, upper surface dark glossy green, lower surface paler and glaucous green or whitish; petiole to 2.5 cm long.  Flowers sulfur or pale yellow, campanulate, 5-lobed, 6-8 cm across, 3-10 in open clusters.
  • 0°F, early-mid, quality rating 3-4/4/3 [flower / plant & foliage / performance; scale 1 (poor) - 5 (best)].   Native to the Himalaya; northeast Burma, China; southeast Tibet, and western Yunnan.
  • campylocarpum: from kampe (Gr.) something bent, and carpum, fruit; hence with a curved fruit.  This was seen by J. D. Hooker, the discoverer of R. campylocarpum in 1848, but often it is straight.
  • coloxanthum: a beautiful yellow.
  • Federal Way, Washington: Rhododendron Species Botanical Garden.
Click image to enlarge
  • plant habit, flowering

    plant habit, flowering

  • flowers


  • leaves