TABLE 1.
Floral morphological and micromorphological characteristics of Arnebia and Lithospermum species.
| Species | A. guttata | A. tibetana | A. euchroma | L. erythrorhizon |
| Inflorescences | Cymes | Cymes | Cymes | Scorpioid cymes |
| Flower color | Yellow | Yellow | Purple | White |
| Calyx lobation | 5-lobed | 5-lobed | 5-lobed | 5-parted |
| Calyx lobe shape | Linear | Linear | Linear | Linear |
| Outer calyx surface | vTR | vTR | sGS, sTR | vTR, sHI |
| Corolla shape | Tubular-campanulate | Tubular-campanulate | Tubular-campanulate | Tubular-campanulate |
| Outer corolla cell | Tabular rugose | Tabular rugose | Tabular rugose | Papillose knobby |
| Outer corolla surface | vTR | vTR | sGS, sTR | vTR |
| Inner corolla cell | Papillose conical | Papillose conical | Papillose conical | Papillose knobby |
| Inner corolla surface | sGS | sGS | Gla | vTR, sGS |
| Style shape | Filiform | Filiform | Filiform | Linear |
| Style lobation | 2-cleft | 2-fid | 2-cleft | Indistinct |
| Stigma number | 2 | 2 | 2 | 2 |
| Stigma shape | Oblate | Oblong | Globose | Globose |
| Stigma surface | Tuberculate | Tuberculate | Tuberculate | Asterisk- tuberculate |
| Ovary surface | Colliculate | Colliculate | Colliculate | Colliculate |
Trichome shape: Gla, glabrous; sGS, smooth glandular trichome with stalk; sTR, smooth non-glandular trichome; and vTR, verrucate non-glandular trichome.