Buglossoides arvensis, (L.) I. M. Johnston

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 : 87

4. B. arvensis (L.) I. M. Johnston , op. cit. 42 (1954)

( Lithospermum arvense L. ).

Annual; stems (T5-)5-50(-90) cm, solitary to many, appressed-setulose-hispid. Lowest leaves oblongspathulate or obovate, obtuse, the others oblong to linear, acute or subacute, usually erect. Cymes solitary or paired. Calyxlobes linear or linear-lanceolate, unequal, acute. Corolla (4-)6-9 mm, white, purplish or blue. Stamens inserted below the middle of the corolla-tube. Nutlets brownish, hard. 2zi= 28, 42. M ost o f Europe. All except Az Fa Is Sb.

1 Nutlets 2-5-4 x 1-5-2-5 mm, with crowded, prominent tubercles; corolla 6-9-5 mm, white (rarely purplish), infundibuliform; calyx usually equalling or longer than corolla-tube in flower; pedicels cylindrical in fruit (a) subsp. arvensis 1 Nutlets 2-3 x 1-5-2 mm; corolla 4-8 mm, blue or white, hypocrateriform; calyx usually distinctly shorter than corolla-tube in flower

2Pedicels cylindrical in fruit; receptacle not oblique in fruit; adaxial nutlet not embedded in receptacle and pedicel; nutlets with prominent tubercles (d) subsp. sibthorpiana 2 Pedicels obconical or davate in fruit; receptacle ±oblique in fruit; adaxial nutlet ±embedded in the receptacle and pedicel; nutlets with small, low tubercles

3 Stems 1-5—17(—45) cm, usually many, procumbent or ascending; cauline leaves l-5-4(-6) mm wide

(c) subsp. gasparrinii 3 Stems 10-65 cm, usually solitary, erect; cauline leaves up to 8(-10) mm wide (b) subsp. permixta