[The Genus Thelypodium East of the Cascade Mountains of Oregon and Washington]

Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium

Thelypodium milleflorum

Synonym: Thelypodium laciniatum var. milleflorum

Flowers of Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum)

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.

Stem leaf of Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum) The photo at right shows a coarsely toothed leaf of the lower stem of fine-leaf thelypody as seen on the northern edge of the Alvord Basin near Mickey Basin in southeastern Oregon. Photographed May 29, 2000.
Characteristics:

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.


Habitat:

Fine-leaf thelypody may be found in arid, sandy soils below 1400 meters of elevation.


Range:

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.


[A photo of a caterpillar munching fine-leaf thelypody.] [A photo of a different species of caterpillar munching fine-leaf thelypody.]

Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum) - Flowers of Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum) - Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum)

Habitat of Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum) - Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum)

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.

Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum) - Flowers of Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum) - Seed pods of Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum) - Lower stem leaf of Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum)

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.

Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum)

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.

Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum)

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.

Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum) - Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum) - Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum)

Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum) - Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum)

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.

Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum) - Seed pods of Fineleaf Thelypody, Manyflower Thelypody, Many-flowered Thelypody, Multiflora Thelypody, Thick-leaved Thelypodium: Thelypodium milleflorum (Synonym: Thelypodium laciniatum var. milleflorum)

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.

Paul Slichter