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FOC | Family List | FOC Vol. 16 | Boraginaceae

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.

1 Calyx parted to middle, lobes triangular; limb of corolla almost not developed, lobes straight; basal leaves not developed   1 Mertensia tarbagataica
+ Calyx parted to base; limb of corolla well developed, lobes reclining; basal leaves developed.   (2)
2 (1) Herbs pubescent.   (3)
+ Herbs glabrous, rarely sparsely pubescent on leaf margin and pedicel.   (4)
3 (2) Leaves oblong, stem leaves many; corolla bright blue or white (drying yellowish); style slightly exserted; nutlets white, rugate-tuberculate   3 Mertensia davurica
+ Basal leaves cordate-ovate or subreniform, stem leaves to 4; corolla sky blue; style long exserted; nutlets brown, pubescent, narrowly winged   2 Mertensia dshagastanica
4 (2) Leaf margin sparsely pubescent, leaf blade 2-4 cm; corolla dark blue   4 Mertensia meyeriana
+ Leaf margin glabrous, leaf blade longer; corolla sky blue.   (5)
5 (4) Leaves fleshy, with white convex dots abaxially; corolla 1.2-1.4 cm; style to 3 mm, exserted from corolla   5 Mertensia sibirica
+ Leaves thin, without white dots; corolla 1.5-1.8 cm; style included   6 Mertensia pallasii

Lower Taxa


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