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Simultaneous cross-fertilization of many florets
must be effected by every visitor crawling over a cluster. The
florets in each disk open in regular array toward the centers. At
the expense of stamens, which are absent in the grayish-white ray
florets, they have attained their development, another instance
of "progress by loss" from the evolutionary standpoint. By
prolonging its season of bloom to get relief from the fierce
competition for insect visitors in midsummer; by increase through
seeds, and runners too; by contenting itself with neglected
corners of the earth, the yarrow gives us many valuable lessons
on how to succeed.
DOG'S or FETID CAMOMILE; MAYWEED; PIG-STY DAISY; DILLWEED;
DOG-FENNEL
(Anthemis Cotula; Maruta Cotula of Gray) Thistle family
Flower-heads - Like smaller daisies, about 1 in. broad; 10 to 18
white, notched, neutral ray florets around a convex or conical
yellow disk, whose florets are fertile, containing both stamens
and pistil, their tubular corollas 5-cleft.


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