Bladderpod (Popweed)
Lesquerella species; Mustard Family (Cruciferae)

The flowers of the Mustard Family have four petals, forming a cross. That fact is the reason for its Latin name, Cruciferae, which means, essentially, "that which bears a cross". The flowers are generally in a raceme. That is, the flowers are borne on short pedicels lying along a common axis (in this specimen, the raceme is definite, but poorly organized).

Each flower has four sepals (the separate leaves that make up the outermost group of floral parts- in the photo above, the unopened buds are encased by the undivided sepals, while in the photo at left, the divided sepals clasp the flower at its base, where it joins the stem) ; usually six stamens (the male parts of the flower, carrying the pollen, consisting of a supporting stem or filament and an enlarged terminus that bears the pollen), two of which are lower than the others; one pistil (the seed-producing, or female organ, consisting of ovary, style and stigma, and, in the Cruciferae, located in the center of the flower) which becomes a two-chambered pod in fruit. 

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