Abstract
A recently-published paper on Tripleurospermum (Asteraceae) gave the impetus to examine a small population of this genus on waste ground in Bradford (v.c.63). A few of the plants appeared to be T. inodorum (L.) Sch. Bip. (Scentless Mayweed) but the others had features of both this species and T. maritimum (L.) W.D.J. Koch (Sea Mayweed), suggesting the hybrid T. inodorum x T. maritimum. This supports the occurrence of the hybrid at inland sites, where any backcrossing and further introgression would mainly be with T. inodorum. In addition, the presence of pure T. maritimum at inland localities cannot be ruled out (perhaps as a halophyte). Such findings reinforce the importance of careful examination of both inland and coastal populations.
Highlights
The features that distinguish Tripleurospermum inodorum (L.) Sch
For T. maritimum achenes were received from two sources, the Sefton Coast and Lincolnshire
Those from the Sefton Coast were used for comparison in this study as those from Lincolnshire were deemed to be a backcross
Summary
The features that distinguish Tripleurospermum inodorum (L.) Sch. Bip. (Scentless Mayweed) from T. maritimum (L.) W.D.J. The features that distinguish Tripleurospermum inodorum (L.) Sch. Bip. (Scentless Mayweed) from T. maritimum (L.) W.D.J. Koch (Sea Mayweed) are largely those of the mature achenes (Stace, 2019). The main difference is in the shape of the subapical oil glands on one face, and the thickness of the ribs and the width of the spaces between them on the other face. There are slight differences in size, though both characters vary a little between authors. 1 and 2) should be used to form a diagnosis
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