Family: | Rosaceae |
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Common name: | rose family [Zomlefer, pp. 181-185] |
Diversity: | Worldwide: 100 genera; ~3,000 species U.S.: 50 genera PNW (Hitchcock & Cronquist): 33 genera |
Flower -- Vegetative Features -- Economic Importance -- Flower Images-- Web Sites |
Flower | |
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K Co5 S P 1, x, | |
Sexuality: | bisexual (rarely dioecious) |
Symmetry: | actinomorphic |
Inflorescence: | solitary, raceme, or cyme |
Calyx (sepals): | 5, basally connate |
Corolla (petals): | 5, separate, short clawed, arising from rim of hypanthium |
Androecium: | numerous stamens, whorled, usu. in several series |
Gynoecium: | unicarpelate with a superior ovary in a hypanthium (=perigynous), many separate carpels with superior ovaries in a hypanthium (=perigynous), or two to five united carpels in a superior or inferior ovary (=perigynous or epigynous) |
Fruit: | achene, aggregate, drupe, pome, or follicle |
Other features: | hypanthium = cup-shaped fushion of androecium and perianth, with nectar producing disc often an epicalyx of five sepal-like organs in a whorl alternating with calyx |
Vegetative Features | |
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some species have thorns or prickles | |
Leaves: | alternate, simple or compound, usu. stipulate |
Life-history: | most perennial, a few annual |
Habit: | herbs, shrubs, trees |
Distribution & Ecology: | cosmopolitan, mostly temperate regions of N. hemisphere |
Some Northwest Genera: | Amelanchier, serviceberry Crataegus, hawthorn Fragaria, strawberry Oemleria, indian plum Potentilla, cinquefoil Prunus, cherry Rosa, rose Rubus, blackberry, salmonberry Sorbus, mountain ash Spiraea, spiraea |
Economic Importance | |
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Crops: | Pyrus, pear Malus, apple (>2,000 named varieties) Prunus, plum, apricot, peach, almond, cherry Fragaria, strawberry |
Ornamentals: | Rosa, rose (>5,000 named cultivars) Prunus, cherry |
Weedy and pest species: | Rubus, blackberry |
Examples | Rosaceae Amelanchier |
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Rosaceae Fragaria |
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Rosaceae Prunus |
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Rosaceae Rosa |
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Rosaceae Rubus |
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click on the genus name for a flower image |
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