involucre double, the outer of short scales; the inner of long linear scales, erect in a single row.
Large umbel of yellow flowers, no involucre and no involucels.
The involucre of the Winkler hazel is formed much more like that of the filbert than that of the hazel.
The classical name, probably from , a helmet, from the involucre.
The involucre is thickly studded with curious little glands, resembling small glass-headed pins.
Spikelets in our species umbelled, and the involucre 2–3-leaved.
The involucre consists of an outer spreading (or reflexed) and an inner and erect row of bracts.
The pinkish-purple flowers form a broad head, over an inch across, with an involucre.
The peduncle is scaly or woolly, and the involucre bracts are of a blackish green colour.
The flower-stalks each bear a pair of flowers, without scent, emerging from an involucre of two bracts.