[Rockcress: The Genus Arabis (and Boechera) Found East of the Cascade Mts. of Oregon and Washington]

Tower Mustard, Tower Rockcress

Turritis glabra

Synonyms: Arabis glabra, Arabis glabra var. furcatipilis, Arabis glabra var. glabra

Inflorescence of Tower Mustard, Tower Rockcress: Turritis glabra (Synonyms: Arabis glabra, Arabis glabra var. furcatipilis, Arabis glabra var. glabra)

The photo above shows a close-up photo of the terminal raceme of tightly compressed flowers of tower rock cress as seen at a rock quarry at about 4100' at the end of Road K6900 on the southeastern slopes of Mt. Adams.........June 13, 2005. The plants seen at this site were all over one meter in height. All the photos on this page were taken at this site.

ower Mustard, Tower Rockcress: Turritis glabra (Synonyms: Arabis glabra, Arabis glabra var. furcatipilis, Arabis glabra var. glabra) - Maturing fruits of Tower Mustard, Tower Rockcress: Turritis glabra (Synonyms: Arabis glabra, Arabis glabra var. furcatipilis, Arabis glabra var. glabra)

Tower rockcress observed at left along the Hanan Trail #142 along the uppermost couple miles of the Sycan River, Fremont-Winema National Forest.......June 17, 2020. The photo at right shows the erect, maturing fruits of tower rockcress observed at Brooks Memorial State Park....June 4, 2021.

Silique of Tower Mustard, Tower Rockcress: Turritis glabra (Synonyms: Arabis glabra, Arabis glabra var. furcatipilis, Arabis glabra var. glabra)

The photo above shows a close-up of the long, narrowly cylindrical seed pod of tower rock cress. The pods are held erect and tightly compressed to the stem, and are only slightly flattened in cross-section.

Stem leaf of Tower Mustard, Tower Rockcress: Turritis glabra (Synonyms: Arabis glabra, Arabis glabra var. furcatipilis, Arabis glabra var. glabra)
The photo above shows the broadly ovate-lancelolate stem leaves of tower rock cress. The blades are somewhat glaucous, strongly clasping at the base (See photo at bottom of page.) and overlapping adjacent stem leaves.

Basal leaf of Tower Mustard, Tower Rockcress: Turritis glabra (Synonyms: Arabis glabra, Arabis glabra var. furcatipilis, Arabis glabra var. glabra)

The photo above shows the scalloped leaf margin of a basal leaf of tower rock cress. The basal leaves are oblanceolate in outline and fairly densely covered with stiff, spreading simple hairs or star-shaped hairs.

Stem leaf of Tower Mustard, Tower Rockcress: Turritis glabra (Synonyms: Arabis glabra, Arabis glabra var. furcatipilis, Arabis glabra var. glabra)

The photo above shows a clasping leaf base and some of the sparse, spreading hairs to be found on the lower stem of tower rock cress..........June 13, 2005.

Stem leaf of Tower Mustard, Tower Rockcress: Turritis glabra (Synonyms: Arabis glabra, Arabis glabra var. furcatipilis, Arabis glabra var. glabra)

Another view of a stem leaf of tower rock cress.

Paul Slichter