| 词条 | Picea critchfieldii |
| 释义 |
| status = | image = | image_caption = | regnum = Plantae | divisio = Pinophyta | classis = Pinopsida | ordo = Pinales | familia = Pinaceae | genus = Picea | species = P. critchfieldii | binomial = Picea critchfieldii | binomial_authority = | range_map = | range_map_width = 240px }}Picea critchfieldii, the Critchfield's spruce, is a species of spruce that became extinct in the Late Quaternary extinction event. It grew in much of eastern North America from 28,000 BP to 15,000 BP. It was a common tree in lower Mississippi River valley forests.[1] References1. ^{{cite web|title=The Extinction of Critchfield’s Spruce (Picea critchfieldii)|url=http://markgelbart.wordpress.com/2011/09/03/the-extinction-of-critchfields-spruce-picea-critchfieldii/|accessdate=11 June 2012}} {{Taxonbar|from=Q7190602}}{{conifer-stub}} 2 : Picea|Prehistoric plants |
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