Heartleaf Twistflower, Heart-Leaved Jewelflower - Streptanthus cordatus
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Streptanthus cordatus - Heartleaf Twistflower, Heart-Leaved Jewelflower.
Streptanthus is a fairly small genus of around 35 species of Mexico and the United States - all are found in the U.S. There are none east of the Mississippi River, although a few species are found as far east as Arkansas and one is in Louisiana. 24 species are found in California.
Streptanthus cordatus is the most widely distributed species in the genus, found in areas dominated by sagebrush, in woodlands, and in rocky soil from 4,000 to 10,000 feet of elevation from California east to New Mexico and north into Colorado, Idaho, and Oregon. It is rare in Oregon.
Found in:
AZ, CA, CO, ID, NM, NV, OR, UT, WY | 
Distribution of Streptanthus cordatus in the United States and Canada:
Map courtesy of The Biota of North America Program.
Map color key
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| | Site: Mesa Verde National Park, Montezuma County, CO Date: 2019-April-28 | Photographer: Gerald C. Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro | | The yellow, purple, or brownish calyx of Heartleaf Twistflower is urn-shaped, cupping the four brownish-purple petals, which are spreading to somewhat reflexed. | | 
| | Site: Mesa Verde National Park, Montezuma County, CO Date: 2019-April-28 | Photographer: Gerald C Williamson
Nikon D7000 | | Streptanthus cordatus has 3 pairs of unequal stamens. The longest pair are exserted in this example. | | Click on the photo for a larger image
| | Site: Mesa Verde National Park, Montezuma County, CO Date: 2019-April-28 | Photographer: Gerald C Williamson
Nikon D7000 | | Streptanthus cordatus can be between 4 and 40 inches tall. It may have one or a few stems from the root, and the stems may be simple or few-branching. The stems may be woody at the base - it is a subshrub. | | Click on the photo for a larger image
| | Site: Mesa Verde National Park, Montezuma County, CO Date: 2019-April-28 | Photographer: Gerald C Williamson
Nikon D7000 | | The stem (cauline) leaves are cordate - giving the "heartleaf" adjective to the common name. The lobes at the base of the leaf usually clasp the stem, although the leaves may occasionally be on short petioles. The margins may be entire or toothed. | | Click on the photo for a larger image
| | Site: Mesa Verde National Park, Montezuma County, CO Date: 2019-April-28 | Photographer: Gerald C Williamson
Nikon D7000 | | Streptanthus cordatus has a rosette of basal leaves. They are usually petiolate - on winged petioles. Although the plant is generally glaucous, the petioles of the basal leaves may be somewhat bristly. The margins of the basal leaf blades are usually toothed, at least near the tips. Occasionally the basal leaves may be pinnately lobed. | | Click on the photo for a larger image
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References used for identification and information:
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