Sourwood or Sorrel Tree (Oxydendrum arboreum) is the sole species in the genus Oxydendrum, in the family Ericaceae. It is native to eastern North America, from southern Pennsylvania south to northwest Florida and west to southern Illinois; it is most common in the lower chain of the Appalachian Mountains.

It is a small tree or large shrub, growing to 10-20 m tall with a trunk up to 50 cm diameter. The leaves are spirally arranged, deciduous, 8-20 cm long and 4-9 cm broad, with a finely serrated margin; they are dark green in summer but turn vivid red in fall. The flowers are white, bell-shaped, 6-9 mm long, produced on 15-25 cm long panicles. The fruit is a small woody capsule. The roots are shallow, and the tree grows best when there is little root competition; it also requires acidic soils for successful growth.

Cultivation and uses

It is renowned for nectar, and for the honey which is produced from it. It is also grown as an ornamental tree, prized for its flowers in the summer and its fall foliage.

External links

---

• Oxydendrum arboreum images at bioimages.vanderbilt.edu

Ericaceae

酸模樹