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Ptelea trifoliata, commonly known as common hoptree, [4] wafer ash, [5] stinking ash, [6] [7] and skunk bush, [7] [8] is a species of flowering plant in the citrus family . It is native to North America, where it is found in Canada, Mexico, and the United States. It is a deciduous shrub or tree, [9] [10] with alternate, trifoliate leaves.
A double graft union of diamante citron upon sour orange rootstock. Sour orange: the only rootstock that truly is an orange (the Citrus × aurantium or bitter orange). It is vigorous and highly drought-resistant. Poncirus trifoliata: a close relative of the genus Citrus, sometimes classified as Citrus trifoliata.
The irregularly-shaped branches contain hooked spines with pinnate 5 cm (2.0 in) leaves. [4] The leaves and bark can be crushed to make a bitter-tasting condiment, and much of the tree smells similar to citrus. [3] Lime prickly-ash has a high drought tolerance and grows best in full sun, but it can also survive as an understory shrub.
Zanthoxylum parvum, known vernacularly as Shinners' tickletongue and small prickly-ash is considered by some botanists to be an isolated and aberrant population of Zanthoxylum americanum. Originally described by Scottish botanist Philip Miller in 1768, [ 4 ] Zanthoxylum americanum is type species of the wide-ranging genus Zanthoxylum in the ...
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The plant is a fairly cold-hardy citrus (USDA zone 6) and will tolerate moderate frost and snow, making a large shrub or small tree 4–8 m (13–26 ft) tall. Because of its relative hardiness, citrus grafted onto Citrus trifoliata are usually hardier than when grown on their own roots.
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Initially, many citrus types were identified and named by individual taxonomists, resulting in a large number of identified species: 870 by a 1969 count. [18] Some order was brought to citrus taxonomy by two unified classification schemes, those of Chōzaburō Tanaka and Walter Tennyson Swingle, that can be viewed as extreme alternative visions of the genus.