The photo above shows the spidery flowers of fine-leaf thelypody as seen on the northern edge of the Alvord Basin near Mickey Basin in southeastern Oregon. Photographed May 29, 2000.
Fine-leaf thelypody is a fairly robust biennial wildflower with one to several erect stems from 45-130 cm high. The stems are typically much-branched above, and are hollow or inflated in cross-section. The basal and lower stem leaves are petioled and more or less narrowly oblong to lanceolate or ovate in shape with pinnately lobed or occasionally coarsely toothed margins. The upper stem leaves are much reduced in size. The herbage of the leaves and stems is glabrous and glaucous.
The inflorescence is a dense, elongated raceme. The sepals are white and measure 3.5-7 mm long. The petals are white with oblanceolate to spatulate blades. The stout pedicel is 2.5-5 mm long and spreading in flower and sharply upcurved in fruit. The fruits are siliques that are erect to erect-ascending, 3.5-8.5 cm long and flattened in cross-section. Each capsule is typically narrowed between seeds (See photo below.).
Fine-leaf thelypody is very similar to thick-leaved thelypody (T. laciniatum) but the latter has thinner leaves, a thinner, non-hollow stem, and leaves which are more divided.
Fine-leaf thelypody may be found in arid, sandy soils below 1400 meters of elevation.
Fine-leaf thelypody is found along the Columbia River in central Washington south through central and southeastern Oregon to Nevada and California and east to Idaho and Utah.
-Fine-leaf thelypody as seen on ashy soils along the west bank of the John Day River opposite the mouth of Esau Canyon, Cottonwood Canyon State Park. Photographed April 6, 2015.
- - -Close-up images of the whole plant, blooming inflorescence, and erect to ascending seed pods of fine-leaf thelypody as seen along Oregon Highway 206 at the John Day River.........April 19, 2007.
A habitat view of fine-leaf thelypody as seen next to the Oregon Highway 206 bridge on the west bank of the John Day River.........May 3, 2017.
Basal leaves of fine-leaf thelypody as observed in ashy soils along the Pinnacles Trail opposite the mouth of Esau Canyon, Cottonwood Canyon State Park and adjacent BLM lands, Sherman County, OR......January 20, 2018.
-What may be fine-leaf thelypody as seen along the Steelhead Falls Trail downstream from the falls, Stellhead Falls Wilderness Study Area.......April 25, 2018. If this isn't T. milleflorum, it will be T. laciniatum.
-Fine-leaf thelypody as seen on the northern edge of the Alvord Basin near Mickey Basin in southeastern Oregon. Photographed May 29, 2000. The stems are thick and hollow. Note the sharply upturned pedicels and the narrowing of the capsule between seeds.