American elm

同根派生

Eurasian elm closely resembling the American elm; thrives in a moist environment.
與美洲榆極相像的一種歐亞榆樹，；在潮溼的環境才能健康生長。
North American elm having twigs and young branches with prominent corky projections.
産於北美洲，細枝和幼小分枝上有引人注目的軟木突起。
North American elm having rough leaves that are red when opening; yields a hard wood.
生長於北美洲，葉麪粗糙，初時呈紅色，；木質堅硬。
Two ecological gradient axes (EGA) were suggested: EGA(CA) and EGA(r2). These two EGA were calculated among twenty provenances of American elm.
EGA(CA_1)和EGA(r~2)。
During my childhood, I sometimes arrived home from school to find my mother in a similar stance, staring through binoculars up into the arching American elm trees that shaded our home.
在孩提時代，有時我從學校廻家後發現母親正保持著同樣的姿勢，通過望遠鏡觀察著那棵彎彎曲曲爲我們家帶來隂涼的美國榆樹。