Lupinus L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1981, Flora Europaea. Volume 2. Rosaceae to Umbelliferae, Cambridge University Press : 105

28. Lupinus L. 1

Annual or perennial herbs, rarely shrubs. Leaves usually digitate, petiolate; stipules adnate to the base of the petiole. Flowers in terminal racemes. Calyx bilabiate, divided almost to the base; corolla variously coloured; wings connate at apex; keel beaked; stamens monadelphous. Legume dehiscent, compressed, usually constricted between the seeds. Seeds 3-12, with a sunken hilum.

1 Annuals; seeds usually more than 5 mm, dull 2 Upper lip of the calyx shallowly bidentate; seeds 8-14 mm

5. albus 2 Upper lip of the calyx 2-partite; seeds not more than 10 mm 3Corolla yellow, cream, pale pink or lilac; flowers regularly arranged in distant whorls 4 Corolla bright yellow; leaflets sparsely appressed-villous above 1. luteus 4 Corolla at first cream becoming pale pink or lilac; leaflets glabrous above except along the margins 2. hispanicus 3Corolla blue or bluish; flowers alternate or irregularly whorled 5 Corolla 15-17 mm; legume 13-20 mm wide 6. varius 5 Corolla 10-14 mm; legume not more than 12 mm wide 6 Leaflets 2-5 mm wide, linear; lower lip of calyx 6-7 mm

3. angustifolius 6 Leaflets 5-15 mm wide, obovate; lower lip of calyx

10-12 mm 4. micranthus 1 Perennial herbs, rarely shrubs; seeds not more than 5 mm,

shining 7 Shrub 100-300 cm; leaflets 5-10 mm wide; corolla usually yellow 10. arboreus 7 Perennial herbs up to 150 cm; leaflets 10-30 mm wide; corolla never yellow 8Leaflets 9-17, 70-150x 15-30 mm; upper lip of calyx entire

9. polyphyllus 8Leaflets 6-11, 15-60 x 8-15 mm; upper lip of calyx emarginate 9 Stems glabrous or pubescent; upper lip of calyx 4-6 mm

7. perennis 9 Stems villous or hirsute; upper lip of calyx c. 8 mm

8. nootkatensis