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''Pinus greggii'', or Gregg's pine, is a small to medium high pine tree native to eastern Mexico, found in two distinct regions. It has an open crown and long and slender branches. The needles are in bundles of three with an average length of 11 cm. The cones are clustered in groups of 5 – 10. The branches en upper trunk is smooth. ''Pinus greggii'' is introduced in several countries. ==Taxonomy== The species was described by George Engelmann in 1868〔in Candolle, Prodr. 16 (2): 396 (1868); distribution: Mexico, Sierra Madre Oriental – as given in Farjon 2001, p. 179〕 Two varieties are found in literature: * ''Pinus greggii'' Engelm. ex Parl. var. ''australis'' Donahue & Lopez〔in Sida 18 (4): 1092 (1999); distr: Mexico, San Luis Potosi, Querétaro, Hidalgo, Puebla – as given in Farjon 2001, p. 179〕 * ''Pinus greggii'' Engelm. ex Parl. var. ''greggii''〔distr: Mexico, Coahuila, Nuevo León – given with no further ref. in Farjon 2001, p. 179〕 The species name ''greggii'' honors Josiah Gregg (1806 – 1850), a merchant, explorer, naturalist, and author of the American Southwest and Northern Mexico. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pinus greggii」の詳細全文を読む スポンサード リンク
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