Cercis canadensis L.

Redbud

Cercis canadensis plant2

Family - Fabaceae

Habit - Trees 3-12 m tall with spreading crowns.

Stems - Trunks single or multiple, often leaning with age, the bark smooth, dark reddish brown, becoming scaly and peeling with age, the twigs slender, zigzag, the winter buds small, rounded, with several scales. Root nodules absent.

Leaves - Appearing after the flowers, simple, entire, petiolate. Petioles 3-6 cm long, swollen at both ends. Stipules minute, scalelike, shed early. Leaf blades 3-15 cm long, 3-15 cm wide, usually heart-shaped, the base cordate, angled or short-tapered to a bluntly to sharply pointed tip, the upper surface glabrous and often glossy, the undersurface glabrous to moderately but inconspicuously hairy, the venation palmate.

Cercis canadensis leaf

Inflorescences - Umbellate clusters produced on short, spurlike shoots from second-year or older twigs and branches, sometimes directly from the trunk, the flower stalks 5-11 mm long.

Cercis canadensis twigFlowering twig.

Cercis canadensis inflorescence2Inflorescence.

Cercis canadensis trunkFlowers on trunk.

Flowers - Perfect, perigynous, strongly zygomorphic. Hypanthium 2-3 mm long, cup-shaped, pinkish-tinged. Calyces of 5 fused sepals, 0.5-1.0 mm long, with short, triangular teeth, persistent at fruiting. Corolla of 5 free petals, these 6-9 mm long, 3-4 mm wide, obovate, tapered to a stalklike base, pinkish purple or rarely white, the banner petal internal to the lateral petals in bud. Stamens 10, all fertile, the filaments not fused, 4-6 mm long, curved, hairy at the base, the anthers about 0.3 mm long, 0.2 mm wide, attached toward the midpoint, dehiscing by lateral slits. Style curved.

Cercis canadensis flowerFlower.

Cercis canadensis calyxCalyx.

Fruits - Legumes, 6-9 cm long, 1.0-1.5 cm wide, strongly flattened, short-stalked, winged along one margin, tapered at each end, papery to leathery, glaucous, few-seeded, without cross-partitions between the seeds, tardily dehiscent, persistent into the winter. Seeds 4.0-4.5 mm long, 3.0-3.2 mm wide, ovoidelliptic to almost circular, flattened, hard, the surface smooth, reddish brown, shiny

Cercis canadensis fruitFruit.

Cercis canadensis fruitMature fruits.

Flowering - March - May.

Habitat - Open woods, thickets, glades, rocky stream banks, bluffs, also cultivated.

Origin - Native to U.S.

Lookalikes - None.

Other info. - This beautiful and delightful springtime sight is common throughout Missouri and most of the eastern continental U.S. When in flower it is impossible to mistake. It is most commonly found as an understory tree, often in association with flowering dogwood. In addition to its common presence in natural communities, it is often cultivated, with a moderate size and growth habit that integrates well into landscaping plans. Splitting of mature trunks and limbs can be a problem, however.

The flowers of C. canadensis are typically pinkish but a pure white-flowered form can also be found (almost entirely in cultivaation). At a glance they appear to be papilionaceous, resembling the flowers most commonly found in members of the legume family, Fabaceae. In fact, the flowers are termed "pseudo-papilionaceous," with banner petals smaller than the wings and internal to them, and the keel petals free rather than fused. These and other floral characters place this species into the Caesalpinioideae subfamily rather than the larger Faboideae group.

The flowers of this species produce nectar and attract bees. The flowers are edible and can be eaten raw or cooked. The immature fruits can be fried and eaten also. The plant is known as "spicewood tree" in the U.S. Appalachian region, where the twigs have been used to flavor wild game. The inner bark of the tree is an astringent.

The species has been subdivided by some authors. Missouri material is referable to var. canadensis.

Photographs taken in Kansas City, MO., 4-28-00, and in Brown Summit, NC., 4-3-03 (DETenaglia); also at Weldon Spring Conservation Area, St. Charles County, MO, 4-21-2008, near Glecoe, St. Louis County, MO, 4-17-2010, and Little Lost Creek Conservation Area, Warren County, MO, 3-30-2012 (SRTurner).


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