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FOC | Family List | FOC Vol. 16 | Boraginaceae

9. Arnebia Forsskål, Fl. Aegypt.-Arab. 62. 1775.

软紫草属 ruan zi cao shu

Ulugbekia Zakyrov.

Plants annual or perennial, bristly or pubescent. Roots frequently containing purple dye. Stems erect or prostrate. Leaves alternate. Cymes bracteate. Flowers often heterostylous. Calyx 5-parted to base, slightly enlarged, base sometimes hardened. Corolla funnelform, usually with hairs outside; tube straight or slightly curved; throat unappendaged; limb usually shorter than tube; lobes spreading. Ovary 4-lobed. Style 2- or 4-branched, each branch terminated with 1 stigma. Gynobase flat. Long-styled flowers with included stamens inserted at middle of corolla tube; style long, slightly exserted. Short-styled flowers with stamens inserted at throat; style shorter, reaching to middle of corolla tube. Nutlets oblique-ovate, tuberculate, adaxially flat or slightly concave; attachment scar at base.

About 25 species: N Africa, Europe, C and SW Asia, Himalaya; six species in China.

1 Corolla blue-purple to purple-red.   (2)
+ Corolla yellow, rarely white.   (3)
2 (1) Plants densely gray-white hirsute; leaves small, less than 2.5 cm   5 Arnebia fimbriata
+ Plants spreading white or pale yellow hirsute; leaves more than 5 cm   6 Arnebia euchroma
3 (1) Herbs annual; stamens spirally inserted at apex of corolla tube   1 Arnebia decumbens
+ Herbs perennial; stamens inserted at same level in corolla tube.   (4)
4 (3) Leaf blade more than 1.5 cm wide   2 Arnebia tschimganica
+ Leaf blade less than 1.2 cm wide.   (5)
5 (4) Stems densely pubescent; stem leaves narrowly ovate to linear-oblong, 1-2 cm; inflorescences widely spaced   3 Arnebia szechenyi
+ Stems both spreading long hispid and short strigose; stem leaves spatulate-linear, 1.5-5.5 cm; inflorescences crowded   4 Arnebia guttata

Lower Taxa


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