An inflorescence (PO:0009049), with a monopodial growth habit, which at anthesis is composed of pedicellate (PATO:0001438) flowers (PO:0009046) on a first order inflorescence axis (PO:0025104) with compressed inflorescence axis internodes (PO:0006326).
The flowers (PO:0009046) of an umbel inflorescence appear as clusters originating from a single point, due to compression of the inflorescence axis internodes (PO:0006326) of the first order inflorescence axis (PO:0025104). Umbel inflorescences are characteristic of the the Ivy family (Apiaceae or Umbelliferae), including english ivy (Hedera helix) and ginseng (Panax ginseng), as well as the Onion family (Alliaceae).
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