Chaerophyllum azoricum, Trelease

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 : 325

6. C. azoricum Trelease , Ann. Rep. Missouri Bot. Gard. 8: 116 (1897).

Robust herb c. 60 cm; stem somewhat purplish. Leaves (l-)2-pinnate; lobes irregularly and jaggedly serrate; petiole, rhachis and lamina with an often dense covering of patent hairs. Bracts 0-3, probably deciduous; bracteoles large and conspicuous. Petals white. Ripe fruit unknown, but probably 15 mm; stylopodium nearly 1 mm, conical; styles patent. • Açores. Az. (7-9). C. hirsutum group. Robust perennials with stems up to 120 cm. Leaves 2- to 3-pinnate. Stems and leaves densely hairy to subglabrous. Bracteoles often unequal. Petals white or sometimes pinkish. Fruit 4-20 mm, narrowly ovoid-oblong, tapering gradually upwards. Styles nearly erect.

A difficult group which requires further investigation. The species here recognized are sometimes treated as subspecies, but as 7 and 9, at least, occur sympatrically in the Alps without intermediates, specific status seems more appropriate.

1 Carpophore divided to i of its length or less, somewhat swollen above the base; lowest segments nearly as large as the rest of the leaf 7. hirsutum

1 Carporphore divided nearly to the base, not noticeably swollen; lowest segments much smaller than the rest of the leaf

2 Lateral umbels mostly opposite or verticillate; stem and leaves with a short, soft, silky pubescence 8. elegans

2 Lateral umbels alternate; stem and leaves subglabrous or with relatively stiff hairs 9. villarsii