What is "populus tremula"

Poplar \Pop"lar\, n. [OE. popler, OF. poplier, F. peuplier, fr. L. populus poplar.] (Bot.)

1. Any tree of the genus Populus; also, the timber, which is soft, and capable of many uses.

   Note: The aspen poplar is Populus tremula and Populus tremuloides; Balsam poplar is Populus balsamifera; Lombardy poplar ( Populus dilatata) is a tall, spiry tree; white poplar is Populus alba.

2. The timber of the tulip tree; -- called also white poplar. [U.S.]

Aspen \Asp"en\ ([a^]s"p[e^]n), Asp \Asp\ ([.a]sp), n. [AS. [ae]sp, [ae]ps; akin to OHG. aspa, Icel. ["o]sp, Dan. [ae]sp, Sw. asp, D. esp, G. espe, ["a]spe, aspe; cf. Lettish apsa, Lith. apuszis.] (Bot.) One of several species of poplar bearing this name, especially the Populus tremula, so called from the trembling of its leaves, which move with the slightest impulse of the air.

Populus tremula, commonly called aspen, common aspen, Eurasian aspen, European aspen, or quaking aspen, is a species of poplar native to cool temperate regions of Europe and Asia, from Iceland and the British Isles east to Kamchatka, north to inside the Arctic Circle in Scandinavia and northern Russia, and south to central Spain, Turkey, the Tian Shan, North Korea, and northern Japan. It also occurs at one site in northwest Africa in Algeria. In the south of its range, it occurs at high altitudes in mountains.

The English name Waverly, meaning "quaking aspen", is both a surname and unisex given name.