Rhamnus
Read about Rhamnus in the Standard Cyclopedia of Horticulture
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Rhamnus (its ancient Greek name). Including Frangula. Rhamnaceae. Buckthorn. Ornamental woody plants grown chiefly for their handsome foliage and some also for their attractive fruit. Deciduous or evergreen shrubs or small trees, sometimes spiny: lvs. alternate or opposite, short-petioled, with small deciduous stipules, penninerved, serrulate or entire: fls. small, in axillary clusters, umbels or racemes, perfect, polygamous or dioecious; sepals, petals and stamens 4-5, petals sometimes wanting; style usually undivided; ovary 2-4-loculed: fr. a globular or oblong 2-4-seeded drupe; nutlets with a leathery usually dehiscent wall.—About 100 species native chiefly to the temperate regions of the northern hemisphere. A few species are found in the tropics and as far south as Brazil and S. Afr. Several species yield yellow or green dyes and the frs. and bark of some are used medicinally. The wood of R. Frangula is made into charcoal valued for the manufacture of gunpowder. The buckthorns are handsome shrubs with generally bright green often rather large leaves and with inconspicuous greenish flowers usually in axillary clusters followed by berry-like, usually black, rarely red, fruits. Many of the species as R. cathartica, R. dahurica, R. fallax, R. Frangula, and R. alnifolia, can be depended upon as hardy, while R. Purshiana and R. lanceolata are hardy at least as far north as Massachusetts. R. imeretina and R. caroliniana are somewhat more tender. The handsomest in foliage are R. fallax and R. imere- tina and the evergreen R. ilicifolia and R. crocea. R. Purshiana, R. caroliniana, R. alnifolia, R. dahurica, and R. Frangula are also noteworthy on account of pretty foliage. Of the evergreen species which are not hardy North, R. crocea and R. ilicifolia are to be recommended for their ornamental bright red fruits. Buckthorns are useful for planting in shrubberies: they like a rather moist soil, especially R. lanceolata, R. alnifolia, R. caroliniana, and R. Frangula, and grow well in shaded or partly shaded situations, but R. cathartica and its allies prefer dry soil. R. cathartica is a valuable hedge plant, though it is now not used so extensively as in the past. The species are propagated by seeds stratified or sown in fall, and by layers. Some, as R. lanceolata, R. fallax, and R. alnifolia, are propagated by cuttings; R. Purshiana, has been successfully raised in England from softwood cuttings put in mild bottom heat under glass about the middle of July. The evergreen species are propagated by cuttings of ripened wood under glass. Rarer kinds are sometimes grafted, those of the Frangula group usually on R. Frangula and the true buckthorns on R. cathartica or allied species.
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Read about Rhamnus in the Standard Cyclopedia of Horticulture
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{{{1}}} The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text. |
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References
- Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963
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