[Rockcress: The Genus Arabis (and Boechera) Found East of the Cascade Mts. of Oregon and Washington]
Tower Mustard, Tower Rockcress
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.
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.
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.
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.
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.
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
Another view of a stem leaf of tower rock cress.