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A Rose flowers have thorns on its stems while Gumamela flowers don't have.
Rose flowers have more petals than those of Gumamelas.
Gumamela flower's stigma is more visible than those of Roses.

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you missed one the gumamela is complete flower it has both male and female organs whie roses don't have
Yes, it has pistil and the stamen. Thank you for the info! :)