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  2. Elm - Wikipedia

    en.wikipedia.org/wiki/Elm

    Seeds from autumn-flowering elms ripen in the fall and germinate in the spring. [12] Since elms may hybridize within and between species, seed propagation entails a hybridisation risk. In unfavourable seasons, elm seeds are usually sterile.

  3. Ulmus americana - Wikipedia

    en.wikipedia.org/wiki/Ulmus_americana

    As in the closely related Ulmus laevis (European white elm), the flowers and seeds are borne on 1–3 cm long stems. American elm is wholly insensitive to daylight length (photoperiod), and will continue to grow well into autumn until injured by frost. [5] Ploidy is 2n = 56, or more rarely, 2n = 28. [6]

  4. Ulmus laevis - Wikipedia

    en.wikipedia.org/wiki/Ulmus_laevis

    Ulmus laevis Pall., variously known as the European white elm, [2] fluttering elm, spreading elm, stately elm and, in the United States, the Russian elm, is a large deciduous tree native to Europe, from France [3] northeast to southern Finland, east beyond the Urals into Kyrgyzstan and Kazakhstan, and southeast to Bulgaria and the Crimea; there are also disjunct populations in the Caucasus and ...

  5. Ulmus pumila - Wikipedia

    en.wikipedia.org/wiki/Ulmus_pumila

    Ulmus pumila, the Siberian elm, is a tree native to Asia. It is also known as the Asiatic elm and dwarf elm , but sometimes miscalled the 'Chinese elm' ( Ulmus parvifolia ). U. pumila has been widely cultivated throughout Asia, North America, Argentina, and southern Europe, becoming naturalized in many places, notably across much of the United ...

  6. Ulmus americana 'New Harmony' - Wikipedia

    en.wikipedia.org/wiki/Ulmus_americana_'New_Harmony'

    The American elm cultivar Ulmus americana 'New Harmony' was raised by the Maryland Agricultural Research Service and released by the United States National Arboretum in 1995, along with 'Valley Forge'. 'New Harmony' proved the most successful U. americana cultivar in the US National Elm Trial, averaging a survival rate of 85.5% overall. [1]

  7. Ulmus serotina - Wikipedia

    en.wikipedia.org/wiki/Ulmus_serotina

    Ulmus serotina, the September elm, is an autumn-flowering North American species of tree. It is uncommon beyond Tennessee ; it is only very locally distributed through Illinois , Kentucky , Arkansas , Mississippi , Oklahoma , Alabama , and Georgia , and disjunct populations into Nuevo León , Mexico. [ 2 ]

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