Identification: Umbel vs Corymb - can we tell by looking?

Discussion in 'Ornamental Cherries' started by wcutler, Apr 17, 2009.

  1. wcutler

    wcutler Esteemed Contributor Forums Moderator VCBF Cherry Scout 10 Years

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    Till yesterday I thought I could tell an umbel from a corymb, but Douglas fixed that!
    Usually, it's easy to see - umbels look like parsley flowers, with all the stems radiating from a single point; corymb stems head out from the peduncle one by one. But it seems in early season flowers, the peduncle can be mere millimeters long and hidden from view, so that corymbs look to us like umbels.

    I was wondering if the bracts around the stem indicate anything. On corymbs, is each pedicel surrounded by bracts (is that the right word)? Here's a Rancho umbel. The second photo is from some upright white tree from the UBC Farm. I'd have guessed Sargentii, but does this arrangement indicate a corymb (and while we're at it, therefore not Sargentii - third photo is the set of trees; fourth is the original photo of the blossom example)?
    20090417_UBCFarm_Ranchor_Cutler_DSC02077.jpg 20090417_UBCFarm_CorymbQr_Cutler_DSC02067c.jpg 20090417_UBCFarm_Cutler_DSC02064.jpg 20090417_UBCFarm_CorymbQr_Cutler_DSC02067.jpg
     
    Last edited: Apr 17, 2009
  2. wcutler

    wcutler Esteemed Contributor Forums Moderator VCBF Cherry Scout 10 Years

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    I think these trees are the ones marked 'Pandora' on the map I now have, and our book says Pandora blossoms are on umbels.
     

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