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Small fast-growing spiny deciduous Chinese orange tree bearing sweetly scented flowers and decorative but inedible fruit: used as a stock in grafting and for hedges.

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Digestion of P. trifoliata DNA with Afa I produced a prominent fragment of approximately 400 bp.
Pubmed
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P. trifoliata variegata is one of the handsomest of golden-leaved trees, and is well worthy of extensive planting.
Hardy Ornamental Flowering Trees and Shrubs
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What are the conditions most favorable to orange trees budded upon sour stock; also upon sweet stock and trifoliata?
One Thousand Questions in California Agriculture Answered
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Menyanthes trifoliata: 84.
The Different Forms of Flowers on Plants of the Same Species
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The trifoliata has been promoted as more likely to induce dormancy of the top growth during cold weather, because of its own deciduous habit.
One Thousand Questions in California Agriculture Answered
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The tree of which the bark* furnishes a salutary remedy for those fevers (* Cortex Angosturae of our pharmacopaeias, the bark of the Bonplandia trifoliata.
Personal Narrative of Travels to the Equinoctial Regions of Amer...