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No key was found for the requested taxon, but it is the only child of Mertensia. Showing where it is keyed below.

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Key to Boraginaceae

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1 Leaves dissected, lobed, or toothed (sometimes the basalmost leaves simple); style fused for a portion of its length, 2-cleft toward the tip; ovary with 1 locule
1 Leaves entire, simple; style various.
..2 Styles 2, distinct to the summit of the ovary
....3 Flowers in axillary cymes; capsule subglobose; leaves 2-12 cm long
....3 Flowers solitary or paired in the leaf axils; capsule cylindrical; leaves 0.5-8 cm long
..2 Styles absent (the stigma sessile and terminal), single, or with 2 branches.
......4 Ovary slightly 2-4-lobed, or not at all lobed; style terminal or reduced to a sessile terminal stigma
......4 Ovary deeply 4-parted; style gynobasic.
........5 Mericarps with glochidiate prickles (like grappling hooks), these visible early in development.
..........6 Mericarps spreading or divergent, attached to the gynobase on the upper third of the mericarp.
............ 7 Flowering stem leafless above the first branch; corolla blue or white; [non-weedy natives]; [subfamily Cynoglossoideae; tribe Cynoglosseae; subtribe Amsinckiinae]
............ 7 Flowering stem with leaves above the first inflorescence branch; corolla blue, pink, or reddish-purple; [weedy exotics]; [subfamily Cynoglossoideae; tribe Cynoglosseae; subtribe Cynoglossinae]
..........6 Mericarps erect, attached to the gynobase near the middle of the mericarp; [subfamily Cynoglossoideae; tribe Rochelieae; subtribe Eritrichiinae].
............ ..8 Fruiting pedicels deflexed; plant perennial or biennial
............ ..8 Fruiting pedicels erect-ascending; plant annual
........5 Mericarps smooth, rugose, or pitted, lacking glochidiate prickles.
............ ....9 Corolla rotate, lacking a well-developed tube, blue; [subfamily Boraginoideae; tribe Boragineae; subtribe Boragininae]
............ ....9 Corolla with a well-developed tube at least 3 mm long, of various colors (including blue).
............ ......10 Corolla lobes distinctly unequal, pink to blue; [subfamily Boraginoideae].
............ ........11 Stamens equal in length, entirely included within the corolla tube; [tribe Boragineae; subtribe Boragininae]
............ ........11 Stamens unequal in length, the longer conspicuously exserted; [tribe Lithospermeae]
............ ......10 Corolla lobes equal, of various colors (including pink to blue); [subfamily Cynoglossoideae].
............ ..........12 Plant a scrambling climber with retrorsely prickly-hispid stems; [subfamily Cynoglossoideae; tribe Asperugeae]
............ ............ 13 Mericarps attached laterally to a pyramidal gynobase.
............ ............ ..14 Corolla yellow, the tube 4-5 mm long; corolla throat lacking appendages; [subfamily Cynoglossoideae; tribe Cynoglosseae; subtribe Amsinckiinae]
............ ............ ..14 Corolla white (with a yellow eye), or pink to blue, the tube 6-20 mm long; corolla throat with appendages.
............ ............ ....15 Corolla pink to blue (rarely white), 18-25 mm long; leaves elliptic or ovate; [plant a native, of moist, nutrient-rich habitats, and sometimes grown as an ornamental] ;[subfamily Cynoglossoideae; tribe Asperugeae]
............ ............ ....15 Corolla white with a yellow eye; leaves linear; [plant a rare exotic, of disturbed habitats]; [subfamily Cynoglossoideae; tribe Cynoglosseae; subtribe Amsinckiinae]
............ ............ 13 Mericarps attached basally to a flat or broadly convex gynobase.
............ ............ ......16 Mericarps laterally compressed, with an evident raised margin; [subfamily Cynoglossoideae; tribe Myosotideae]
............ ............ ......16 Mericarps neither laterally compressed nor with an evident thickened margin.
............ ............ ........17 Mericarps with a prominent, toothed, basal rim; [subfamily Boraginoideae; tribe Boragineae; subtribe Boragininae]
............ ............ ........17 Mericarps lacking a prominent, toothed, basal rim; [subfamily Boraginoideae; tribe Lithospermeae].
............ ............ ..........18 Corolla whitish or bluish white; plant annual from a slender taproot; leaves without evident lateral veins; mericarps brown, dull, wrinkled and pitted; [plant a weedy exotic]
............ ............ ..........18 Corolla bright yellow-orange, or greenish-white; plant perennial from a thickened, woody rhizome; mericarps white, shining, smooth or pitted; [plant a native]
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