Eastern Mojave Vegetation Coll. No. 3512, 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 4 December 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. 39.20591°N, 105.34897°W. WGS 1984 Elev. 2397 m. Dense thicket about 125 m. by 25 m. wide on both sides of Twin Creek. Coll. Nos. 3511 and 3512.1 made on the ends of the thicket have only pistillate catkins; Coll. No. 3512 made in the middle of the thicket has both pistillate and staminate catkins.

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

Tom Schweich 3512. 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