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Prickly ash

Also known as: toothache tree

Zanthoxylum americanum P. Mill.

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Prickly ash
Prickly ash pistillate flowers
Prickly ash buds
Prickly ash
Prickly ash
Prickly ash fruit
Prickly ash staminate flowers
Prickly ash pistillate flowers
Prickly ash
Prickly ash fruit
Prickly ash
Prickly ash bud and leaf scar
Prickly ash fruit
Prickly ash fruit

Morphology

Trunk
Single, usually branched above middle, occasionally with branches near ground; crown irregular; bark dark-brown with light blotches, slightly furrowed on old trunks.
Twigs
Rigid, glabrous, dark brown; usually 2 prickles at each node; prickles flat, broad-based, curved downward; leaf scars crescent-shaped or half-round; bundle scars 3; buds small, spherical, covered with red woolly hairs.
Leaves
Alternate, odd pinnately-compound, deciduous, 2 to 10 inches long, aromatic; stalk about 1.2 inch long, pubescent; leaflets 5-11, nearly sessile, egg-shaped, 1.2 to 2.4 inches long, 3/5 to 1.2 inch wide; upper surface dark green, slightly rough, glandular-dotted; lower surface paler, veins pubescent; margin entire or finely toothed; tip abruptly pointed; base rounded or blunt.
Flowers
Before leaves, inconspicuous, dioecious (male and female flowers on separate trees); staminate flowers in clusters of 2-10; stalk 1/8 to 1/6 inch long; calyx absent; petals 4-6, egg-shaped, 1/12 to 1/10 inch long, green; tip with red fringe; stamens 5-6; anthers small, yellow; pistillate flowers 2-10, in umbel-like clusters; stalks 1/8 to 1/6 inch long, calyx absent; petals similar to staminate; pistils 2-5; styles 1/12 inch long, green; stigmas spherical, green.
Fruit
July-August; dense clusters; stalk 1/10 inch long; spherical, fleshy, about 1/5 inch in diameter, red, surface pitted, strongly spice-scented; seed oval, about 1/6 inch long, glossy black, finely pitted.

Ecology

Habitat
Rocky hillsides, open woods, woodland edges, roadsides, prairie ravine thickets; usually in calcareous soils.
Distribution
East 3/5 of Kansas

Practical Information

Uses
Native Americans steeped the bark and used the liquid as a wash for itching; took it for colds, fevers, and coughs; and rubbed on dog noses to enhance their scent. The inner bark was pounded and chewed, smoked, or packed around a tooth for toothaches. A poultice of crushed inner bark was applied for rheumatism. Young men sometimes used the fruits as perfume.

Additional Notes

Comments

Prickly ash forms thickets from underground, creeping stems. The common name "toothache tree" was given because oil derived from the fruit was used as a home remedy for toothaches. The wood is soft, porous, pale yellowish-brown. Greek xanthos "yellow" and xylon "wood".

Quick Facts
Plant Type
Tree
Family
Rutaceae - Citrus Family
Height
20 inches to 16 feet
Origin
Native
Last Updated
2010-09-06
Flowering Period
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Blooms: April