Phacelia tanacetifolia, Bentham

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 : 83

1. P. tanacetifolia Bentham , Trans. Linn. Soc. London 17: 280 (1835).

Stems 20-80 cm, glandular-pubescent and hispid, usually erect and simple or sparingly branched. Leaves 2-10 cm, shortly petiolate, ovate to ovate-oblong in outline, 1 - to 2-pinnatisect. Calyx-lobes (5-)6-8, usually linear. Corolla 6-9 mm, blue, persistent. Stamens long-exserted. Styles connate for c. 1 mm. Capsule 3-4 mm, ovoid, pubescent at apex. Cultivated for bees andfrequently naturalized. [Au Be Bu Cz Da Ga He Ho Hu Ju Lu No Po Rm Rs (B, C, W, E) Su.] (IF. North America.)

Several other species of this large American genus are cultivated and some have been recorded as more or less naturalized. The two commonest of these are: P. ciliata Bentham , loc. cit. (1835), with a strongly accrescent calyx, and P. minor (Harvey) Thell. , Ber. Bayer. Bot. Ges. 14: 79 (1914), with pedicels up to 15 mm and the styles connate to above the middle.