Valerianella amarella

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flowers flowers closeup--how many petals are there?  Are these flowers actinomorphic or zygomorphic?

flowers again--in Valerianella, everything occurs in pairs.  Do you see that just inside each flower, there is a pair of flower buds?  This process is repeated until you get an inflorescence similar to the that shown in the first two images above. leaves--are these leaves opposite or alternate?
habit--Valerianella amarella is a low-growing annual.  Do you see the dichotomous branching at every node?