Ajuga L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1972, Flora Europaea. Volume 3. Diapensiacea to Myoporaceae, Cambridge: Cambridge University Press : 128

1. Ajuga L. 1

Annual or perennial herbs. Calyx more or less actinomorphic, with 10 or more veins. Upper lip of the corolla usually very short; lower lip 3-lobed; tube with a ring of hairs inside. Stamens didynamous, all usually exserted. Style not gynobasic. Nutlets reticulate-veined or transversely rugose. 2,3 and 4 are interfertile, and hybrids have been recorded from most areas where any two of these species grow together. 1 Leaves 3-partite with linear, sometimes 3-fid segments

10. chamaepitys 1 Leaves entire, toothed or shallowly lobed

2 Leaves 3—6(—8) mm wide, linear to linear-oblong 9. iva 2 Leaves 8-40(-50) mm wide, oblong to obovate-orbicular

3 Stamens included in the corolla-tube; upper lip of corolla with 2 conspicuous lobes 1. orientalis 3 Stamens ±exserted from the corolla-tube; upper lip of corolla entire or with 2 short teeth or lobes

4 Acaulescent, or with stems not more than 5 cm 5. tencrii 4 Caulescent, with stems more than 5 cm

5 Flowers solitary in the axil of each bract

6 Cauline leaves sessile, semiamplexicaul; corolla-tube shorter than the calyx 7. laxmannii 6 Cauline leaves very shortly petiolate, not semiamplexicaul; corolla-tube exceeding the calyx

7 Calyx 6-10(-ll)m m; lower leaves 10-22 mm wide,

entire or dentate 6. salicifolia 7 Calyx 11-15 mm; lower leaves 25-45 mm wide, coarsely and remotely serrate-dentate 8. piskoi 5 Flowers 4 or more in a whorl at each node

8 Middle and upper part of stem pubescent on opposite faces, alternating at each node 4. reptans 8 Middle and upper part of stem ± evenly hairy on all faces

9 Stamens conspicuously exserted from the corolla-tube,

the filaments hairy; upper bracts often shorter than the flowers 2. genevensis 9 Stamens only slightly exserted from the corolla-tube, the filaments glabrous; upper bracts exceeding the flowers 3. pyramidalis