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Erigeron subtrinervis
Erigeron subtrinervis (Showy Daisy)
Asteraceae (Sunflower Family)

Montane, subalpine.  Meadows.  Summer.
Robertson Pasture Trail, Abajo Mountains, Utah, August 16, 2011.

Erigeron subtrinervis is almost indistinguishable from Erigeron speciosus, and, in fact, Welsh (A Utah Flora) considers the taxon to be just a variety of E. speciosus.  The Flora of North America and John Kartesz, the ultimate authority for plant names on this web site, consider them each at the species level. Weber (Colorado Flora) lists them as separate species but says, that E. subtrinervis "may simply be a race of" E. speciosus.

Keys to the morphological details of E. subtrinervis and E. speciosus are almost identically worded. The Flora of North America separates the two species on the basis of their hairiness:

Both species have hairs along the margins of the leaves but only E. subtrinervis has hairs on the surface of its leaves.

The phyllaries of S. speciosus are "usually glabrous, sometimes sparsely [hairy]"; the phyllaries of E. subtrinervis are "moderately to densely [hairy]".

The stems of S. speciosus are "glabrous or sparsely [hairy]; the stems of E. subtrinervis are "moderately to densely [hairy]".

After this species was named and described Erigeron glabellum by Asa Gray in 1863 from a specimen collected by Hall and Harbour in Colorado in 1862, it was renamed and described by Rydberg in 1894 . "Subtrinervis" means "weakly 3-nerved".

Erigeron subtrinervis

Erigeron subtrinervis (Showy Daisy)
Asteraceae (Sunflower Family)

Montane, subalpine.  Meadows.  Summer.
Robertson Pasture Trail, Abajo Mountains, Utah, August 16, 2011.

Erigeron subtrinervis
Erigeron subtrinervis

Erigeron subtrinervis (Showy Daisy)
Asteraceae (Sunflower Family)

Montane, subalpine.  Meadows.  Summer.
Robertson Pasture Trail, Abajo Mountains, Utah, August 16, 2011.

Both E. subtrinervis and E. speciosus have hairs along the leaf margins, but notice that the surface of E. subtrinervis leaves (at least those at mid and upper stem level) has hairs. Also notice the hairy stem. As noted above, these latter two characteristics help to separate E. subtrinervis from E. speciosus.

Range map © John Kartesz,
Floristic Synthesis of North America

State Color Key

Species present in state and native
Species present in state and exotic
Species not present in state

County Color Key

Species present and not rare
Species present and rare
Species extirpated (historic)
Species extinct
Species noxious
Species exotic and present
Native species, but adventive in state
Eradicated
Questionable presence

Erigeron subtrinervis

Range map for Erigeron subtrinervis