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24. Mertensia Roth, Catal. Bot. 1: 34. 1797.
滨紫草属 bin zi cao shu
Herbs perennial, glabrous or pubescent, with thin rhizomes. Basal leaves usually withering early, ovate; stem leaves alternate. Cymes terminal, several flowered, becoming racemelike, ebracteate. Flowers pedicellate. Calyx 5-cleft or 5-parted, shorter than corolla tube; lobes lanceolate to ovate, not changing much in fruit. Corolla funnelform, usually sky blue or blue; throat with transverse folds or scalelike appendages; lobes spreading, ovate to oblong or semiorbicular, apex obtuse. Stamens inserted between appendages or slightly below; filaments short, filiform or ligulate; anthers oblong to ovate, longer than filaments, exserted. Ovary 4-parted. Style filiform, exserted from corolla. Gynobase conical. Nutlets tetrahedral, glabrous; adaxially sharp, sometimes nearly winged on keel; abaxially convex, wrinkled, tuberculate, rarely narrowly winged along margin; attachment scar at base adaxially.
About 15 species: Asia, E and NW Europe, North America; six species in China.
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| 1 |
Calyx parted to middle, lobes triangular; limb of corolla almost not developed, lobes straight; basal leaves not developed |
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1 Mertensia tarbagataica |
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Calyx parted to base; limb of corolla well developed, lobes reclining; basal leaves developed. |
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(2) |
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| 2 (1) |
Herbs pubescent. |
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(3) |
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Herbs glabrous, rarely sparsely pubescent on leaf margin and pedicel. |
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(4) |
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| 3 (2) |
Leaves oblong, stem leaves many; corolla bright blue or white (drying yellowish); style slightly exserted; nutlets white, rugate-tuberculate |
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3 Mertensia davurica |
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Basal leaves cordate-ovate or subreniform, stem leaves to 4; corolla sky blue; style long exserted; nutlets brown, pubescent, narrowly winged |
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2 Mertensia dshagastanica |
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| 4 (2) |
Leaf margin sparsely pubescent, leaf blade 2-4 cm; corolla dark blue |
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4 Mertensia meyeriana |
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Leaf margin glabrous, leaf blade longer; corolla sky blue. |
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(5) |
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| 5 (4) |
Leaves fleshy, with white convex dots abaxially; corolla 1.2-1.4 cm; style to 3 mm, exserted from corolla |
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5 Mertensia sibirica |
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Leaves thin, without white dots; corolla 1.5-1.8 cm; style included |
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6 Mertensia pallasii |
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Lower Taxa
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