Also called Milfoil, “thousand-leaf,” from the finely divided leaves. A European import that has become a common wildflower all over the East. Still a popular garden flower; in recent years many colors have been bred, but the wild ones are almost always white, or more rarely pink. The blooming season is long, from June through October.
More at the full article on Achillea millefolium.
Considered a noxious weed in some parts, but around here it seldom takes over enthusiastically enough to be a problem. This is the flower commonly known as “daisy” to Americans, and it is more beloved than hated almost everywhere it grows. It holds its daisies up proudly on long stems perfect for cutting. In most of our older references, this species is placed in the genus Chrysanthemum.
More at the full article on Leucanthemum vulgare.
We have added two more pictures to the page for Malva neglecta, both of plants blooming in Beechview in late June.
Obviously this is not known as Pittsburgh Pest everywhere in its nearly global range, but the name seems to be well established here, and it is frequently used elsewhere in the United States. It has many other names in English, including the delightful folk etymology “Gallant Soldiers.” It comes originally from South America, where it is a popular ingredient in Colombian and Bolivian cuisine.
The flowers are like tiny five-rayed daisies; the plant is low and hairy, and can grow from any crack in the pavement. It is very much an urban weed, ubiquitous in the city of Pittsburgh, but much rarer in the near suburbs, and unknown in all the other counties of the metropolitan area but one (Washington County).
More at the full article.
A very common but always delightful weed; its multiple heads of cheery daisy-like flowers bear large numbers of delicate white rays. It can be found on roadsides, at the edges of parking lots, in vacant lots, or in lawns given half a chance. Its peak blooming season is in June. These plants were blooming near Saw Mill Run in Seldom Seen.