Callistemon and Melaleuca Bottlebrushes, Paperbarks And

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Plant of the Week Callistemon and Melaleuca Bottlebrushes, Paperbarks and Honey Myrtles There often seems to be some confusion about Callistemon (Bottlebrushes) and Melaleuca (Honey Crimson Bottlebrush Callistemon citrinus Myrtles and Paperbarks). How do you tell them apart? Both belong to the Myrtaceae, a family comprising trees, shrubs and mallees. All have simple, aromatic leaves dotted with oil glands that are usually easily seen if you hold a leaf up to the light. There are two main groups within the Myrtaceae: the first comprises mostly rainforest trees that have succulent fruits; the second group, found in drier environments, has woody fruits (capsules). Callistemon and Melaleuca belong in the latter group. Many genera also have numerous, conspicuous stamens, as do Callistemon and Melaleuca. Australia has about 1,400 species of Myrtaceae in ~ 70 genera, but you can also find Myrtaceae in tropical and temperate parts of the world, particularly South America and Malesia, so you can see this family has a particularly southern hemisphere distribution. How do you tell Callistemon from Melaleuca? If you look closely at the ‘flowers’ you will see that each ‘brush’ consists of many small, individual flowers with relatively inconspicuous sepals and petals. Now, here’s the difference. Both have an abundance of long, showy stamens; those of the Melaleuca are fused into five bundles or ‘claws’, those of Callistemon are attached only at the base. Red Flowering Paperbark Melaleuca hypericifolia Just now you can see many species and varieties of red Bottlebrushes (Callistemon) flowering on campus. The Green Flowered Bottlebrush (Callistemon pinifolius) and Red Flowering Paperbark (Melaleuca hypericifolia) can be seen outside student housing in Waterloo Road. The pristine white Snow-in-Summer (Melaleuca lineariifolia) is flowering along the creek near Research Park Drive and also just near the Gym. Alison Downing & Kevin Downing, 7.11.2010 (唐爱森, 唐科文－2010 年 11 月 7 日) Downing Herbarium, Department of Biological Sciences Snow-in-Summer Melaleuca lineariifolia Green Flowered Bottlebrush Callistemon pinifolius.

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