Ridolfia Segetum, Bishop's Weed, נירית הקמה
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| | Scientific name: |
| Ridolfia Segetum |
| Common name |
| Bishop's Weed |
| Hebrew name: |
| נירית הקמה |
| Family: |
| Umbelliferae (Apiaceae), סוככיים |

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| | Life form (Raunkiaer): |
| Annual |
| Leaves: |
| Alternate, rosette, dissected |
| Flowers: |
| Yellow |
| Flowering Period: |
| April, May, June |
| Habitat: |
| Batha, Phrygana |
| Distribution: |
| The Mediterranean Woodlands and Shrublands, Semi-steppe shrublands, Shrub-steppes, Deserts and extreme deserts |
| Chorotype, טיפוס התפוצה: |
| Mediterranean |
| Summer shedding: |
| Ephemeral |

Ridolfia segetum is a frequent umbelliferous weed in sunflower crops in the Mediterranean basin.
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