Eastern Mojave Vegetation Coll. No. 3511, Alnus incana ssp. tenuifolia  
 

 

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If you have a question or a comment about this photograph you may write to me at: tomas@schweich.com I sometimes post interesting questions in my FAQ, but I never disclose your full name or address. 		  Betulaceae, Alnus incana tenuifolia
Photographed 3 September 2025.

Plants of Colorado
East Slope of Tarryall Mountains, Jefferson County
Betulaceae

Alnus incana (L.) Moench ssp. tenuifolia (Nutt.) Brietung.  Thinleaf Alder.

Twin Creek, Jefferson County, Colorado. About 7 miles west and south on F. R. 211 from its north end at County Road 126 to a USFS designated parking place, then about 325 m. generally northwest on old roads into the Twin Creek drainage, 11.8 km. southwest of Deckers. 39.20556°N, 105.34889°W. WGS 1984 Elev. 2388 m. Dense thicket about 125 m. by 25 m. wide on both sides of Twin Creek. Coll. Nos. 3511 and 3512.1 have only pistillate catkins; Coll. No. 3512 has both pistillate and staminate catkins.

Collected by permit: Pike San Isabel National Forest, 2025, issued: Mar 26, 2025, to: Tom Schweich.

Tom Schweich 3511. 3-Sep-2025

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Other photos about Species or Betulaceae Alnus incana tenuifolia.

 

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Date and time this page was prepared: 4/4/2026 8:04:23 PM