[Members of the Sunflower Family with Both Discoid and Ray Flowers in the Cascade Mountains]

Least Tarweed, Smallhead Tarweed, Small-head Tarweed

Hemizonella minima

Synonyms: Hemizonia minima, Madia minima

Least Tarweed, Smallhead Tarweed, Small-head Tarweed: Hemizonella minima (Synonyms: Hemizonia minima, Madia minima)

Least tarweed as seen on vernally moist swales on south-facing slopes near Fivemile Butte Lookout, Mt. Hood National Forest.........May 17, 2015. Although difficult to see from this angle, the stem leaves are generally opposite. The similar least tarweed (Madia exigua) has alternate stem leaves.

Least Tarweed, Smallhead Tarweed, Small-head Tarweed: Hemizonella minima (Synonyms: Hemizonia minima, Madia minima)

What appears to be young least tarweed blooming along the summit ridge of Lookout Mountain, northern edge of the Badger Creek Wilderness..........June 21, 2014. Note that they can begin blooming as soon as emerging from the soil. This is a time when it can be hard to distinguis this species fromthe similar Madia exigua.

Least Tarweed, Smallhead Tarweed, Small-head Tarweed: Hemizonella minima (Synonyms: Hemizonia minima, Madia minima) - Least Tarweed, Smallhead Tarweed, Small-head Tarweed: Hemizonella minima (Synonyms: Hemizonia minima, Madia minima)

The upper stem and inflorescence of least tarweed as seen in the King Mountain Rock Garden ACEC of the Umpqua National Forest.........June 25, 2005. Note the gland-tipped hairs on the involucral bracts and stems.

Least Tarweed, Smallhead Tarweed, Small-head Tarweed: Hemizonella minima (Synonyms: Hemizonia minima, Madia minima)

Least tarweed as seen atop Grizzly Peak, Cascade-Siskiyou National Monument.......May 27, 2021.

Least Tarweed, Smallhead Tarweed, Small-head Tarweed: Hemizonella minima (Synonyms: Hemizonia minima, Madia minima)

The basal leaves of least tarweed as seen in the King Mountain Rock Garden ACEC of the Umpqua National Forest.......June 25, 2005.

Paul Slichter