Great Mullein
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Verbascum thapsus
Common & widespread throughout Britain.
Flowers are pentamerous with (usually) five stamen, a five-lobed calyx tube, and a five-petalled corolla, the latter bright yellow and 1.5–3 cm (0.59–1.18 in) wide.
The flowers are almost sessile, with very short pedicels (2 mm, 0.08 in).
The five stamens are of two types, with the three upper stamens being shorter, their filaments covered by yellow or whitish hairs, and having smaller anthers, while the lower two stamens have glabrous filaments and larger anthers.
Flowers from June-August.