Myosotis latifolia, Poiret

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 : 114

20. M. latifolia Poiret in Lam., Encycl. Méth. Bot. 12: 45 (1816).

Like 19 but stems up to 70 cm, woody at base, often with large basal leaves; calyx more than 7 mm in fruit, with numerous hooked hairs up to 0-6 mm; corolla-tube twice as long as calyx, limb more than 10 mm in diameter, anthers included; style not exserted; nutlets up to 3 x 2 mm. Açores. Az. (TV. W. Africa, Islas Canarias.) (21-29). M. alpestris group. Perennial with short rhizome and numerous, often long and somewhat fleshy roots. Stems usually roughly hairy below, rarely glabrous; inflorescence with appressed hairs. Calyx densely hairy, more or less acute at the base in fruit, closed or slightly open, never deciduous. Corollatube shorter than calyx; limb flat. Nutlets often more than 2 mm, ovoid to ellipsoid, obtuse, black, shining; attachment-area wide, elliptical to reniform, usually extended laterally into two grooves. A group of closely related species, many of which occur in the montane and alpine zones of the European mountains.

1 Calyx with few or no hooked bristles

2 Basal leaves narrowly ovate, acute, with slender petioles; cauline leaves lanceolate to linear; hairs on calyx appressed

3 Basal leaves glabrescent only beneath or not at all

24. stenophylla 3 Basal leaves glabrescent on both surfaces 25. asiatica 2 Basal leaves elliptical to oblong-lanceolate, sessile or stalked; cauline leaves ovate to lanceolate; hairs on calyx patent

4 Calyx with dense, straight, white hairs, more or less swollen at base in fruit 23. ambigens 4 Calyx rarely with dense, white hairs, not swollen at base in fruit 21. alpestris 1 Calyx with ± numerous hooked bristles

5 Hooked bristles on pedicels as well as calyx; nutlets narrowly ovoid; basal leaves glabrescent beneath

6 Basal leaves petiolate, rounded; plant up to 25 cm

27. corsicana 6 Basal leaves not petiolate, Ungulate; plant up to 12 cm, forming a mat 26. alpina 5 Hooked bristles not present on pedicels; basal leaves hairy beneath, rarely glabrescent

7 Cauline leaves uniform, narrowly linear, obtuse; nutlets narrowly ovoid 29. lithospermifolia 7 Cauline leaves variable, broadly ovate to linear; nutlets ovoid to ellipsoid

8 Nutlets up to 1-8 mm; rim much elongated at upper end

22. gallica 8 Nutlets usually more than 1-8 mm; rim not much elongated

9 Nutlets with complete rim; calyx with numerous hooked hairs; flowers deep blue 28. suaveolens 9 Only upper part of nutlet with rim; calyx with fewer hooked hairs; flowers bright blue 21. alpestris