Typical food plants include common nettle, docks, common knotgrass, fat hen, common chickweed, and yarrow. Asteraceae are important in herbal medicine, including "Grindelia", yarrow, and many others. Hexagrams may be generated by the manipulation of yarrow stalks. The scent of plants such as yarrow acts as an olfactory attractant to females. Their tributaries are the Calder, Darwen, Douglas, Hodder, and Yarrow. Its name is derived from the initials of its founders, Bob Sommers and Doug Yarrow. The steam plant consisted of 42 Yarrow boilers arranged in seven boiler rooms. Yarrow and tortoiseshell are considered to be lucky in Chinese tradition. The Parsons turbines were powered by eighteen Yarrow boilers. The Black Brook is a tributary of the Yarrow. BAE now owns VSEL in Barrow and the Yarrow and Govan shipyards on the Clyde. Pete Yarrow because he was so flustered. Steam was provided to the turbines by 18 Babcock & Wilcox or Yarrow boilers. The boilers were replaced by eight superheated Yarrow boilers. At one point, he was considered for a folk-pop trio with Peter Yarrow.