116 TREES OF THE NOR1HERN UNITED STATES 
ORDER XXV. HBRICACEAS. (Heata Famity.) 
A large order, mainly of shrubs, though a few species 
are herbs, and fewer still are tall enough to be considered 
trees. 
Genus 50. OXYDENDRUM. 
Trees with deciduous, alternate, oblong-lanceolate, 
pointed, serrate, sour-tasting leaves. Flowers small, in 
large panicles at the ends of the branches. In summer. 
Fruit small, dry capsules, with 5 cells and many seeds. 
Oxydéndrum arbéreum. DC. (Sor- 
REL-TREE. SouRwoop.) Lewves in size 
and shape much like those of Peach trees. 
Flowers small, urn-shaped. Small-sized 
(—~ tree, 15 to 50 ft. high; wild in rich woods, 
| . 3 
ra Pennsylvania and southward, mainly in 
O. arboreum. the mountains. Rare in cultivation, but 
very beautiful, especially in autumn, when its leaves are brilliantly 
colored, and the panicles of fruit still remain on the trees. It is 
perfectly hardy both at the Arnold Arboretum, Boston, and the Mis- 
souri Botanical Garden, St. Louis. 
Genus 51. KALMIA. 
Evergreen shrubs with alternate, entire, thick, smooth 
leaves. Fiowers large, beautiful, cup-shaped, in showy 
clusters. Fruit a small, 5-celled, many-seeded capsule. 
Kalmia latifolia, L. (Movuntain- 
LAUREL. CALICO-BUSH.) The only spe- 
cies which grows at_all tree-like has 
ovate-lanceolate or elliptical, smooth, 
petioled leaves, tapering at both ends 
and green on both sides. Flowers in 
terminal corymbs, clammy-pubescent, 1 
white to pink. June. Pod depressed, 2 
glandular. Shrub or small tree, 4 to 25 ft. K. latifolia. 
high, with reddish twigs; wild in rocky hills and damp soils through 
out; occasionally planted. Wood very hard and close-grained. 
