Northern White Cedar Thuja occidentalis LinnaeusThreatened (MD)  -  S1 (Highly state rare)    
Kingdom Plantae   >   Division Coniferophyta   >   Class Pinopsida   >   Order Pinales   >   Family Cupressaceae   >   Genus Thuja   

Status:

Northern White Cedar grows predominantly north of Maryland. The discovery of Northern White Cedar growing naturally in Maryland dates to 1983, when three stations, all on limestone cliffs overlooking the Potomac River, near Ferry Hill, in Washington County, were reported by Nature Conservancy botanist Larry Morse in an article in the journal "Castanea." Nearly three decades later, a new station was found, near Big Slackwater Boat Ramp, on the Potomac, several miles upstream from Ferry Hill. Larry concluded that the stands are native, "persisting from late-glacial times in the cool, moist habitat of these steep, northerly-facing cliffs." Before Larry's report, Brown and Brown (1972) mentioned the species but stated that "no natural stands are known in Maryland" (J. Hill/MNPS).

Description:

Its flat, smooth, fan-like sprays of leaves distinguish Northern White Cedar from Eastern Red Cedar, which has somewhat prickly juvenile leaves and often occurs along with Northern White Cedar (J. Hill/MNPS).

There are 35 records in the project database.

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The cones of a Northern White Cedar in Washington Co., Maryland. Photo by Jim Brighton. (MBP list)

Northern White Cedar in Washington Co., Maryland (10/21/2012). Photo by Carole Bergmann. (MBP list)

Stand of Northern White Cedar on limestone cliff in Washington Co., Maryland (10/21/2012). Photo by Carole Bergmann. (MBP list)

Northern White Cedar in Washington Co., Maryland (3/6/2021). (c) tomfeild, some rights reserved (CC BY-NC). Photo by Tom Feild. (MBP list)

Northern White Cedar in Washington Co., Maryland (3/6/2021). (c) tomfeild, some rights reserved (CC BY-NC). Photo by Tom Feild. (MBP list)

Northern White Cedar in Washington Co., Maryland (3/19/2020). (c) ptbrnchbob, some rights reserved (CC BY-NC). Photo by ptbrnchbob via iNaturalist. (MBP list)

Northern White Cedar in Washington Co., Maryland (3/19/2020). (c) ptbrnchbob, some rights reserved (CC BY-NC). Photo by ptbrnchbob via iNaturalist. (MBP list)

Northern White Cedar in Washington Co., Maryland (4/15/2018). Photo by Bill Hubick. (MBP list)

Northern White Cedar (trunk) in Washington Co., Maryland (4/15/2018). Note Yellow-bellied Sapsucker drill wells. Photo by Bill Hubick. (MBP list)

Northern White Cedar in Washington Co., Maryland (3/6/2021). (c) Jim Brighton, some rights reserved (CC BY-NC). Photo by Jim Brighton. (MBP list)

Northern White Cedar (trunk) in Washington Co., Maryland (3/5/2017). Photo by Bill Hubick. (MBP list)

Northern White Cedar in Washington Co., Maryland (3/6/2021). (c) Jim Brighton, some rights reserved (CC BY-NC). Photo by Jim Brighton. (MBP list)

Northern White Cedars in Washington Co., Maryland (3/5/2017). Photo by Bill Hubick. (MBP list)

Northern White Cedar in Washington Co., Maryland (3/6/2021). (c) tomfeild, some rights reserved (CC BY-NC). Photo by Tom Feild. (MBP list)

Northern White Cedar in Washington Co., Maryland (3/6/2021). (c) tomfeild, some rights reserved (CC BY-NC). Photo by Tom Feild. (MBP list)


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