hypericum ascyron(n = noun.plant) great st john's wort, hypericum pyramidatum - perennial shrub having large star-shaped yellow flowers in narrowly pyramidal cymes;
is a kind of st john's wort

genus hypericum, hypericum, hypericum androsaemum, hypericum calycinum, hypericum crux andrae, hypericum gentianoides, hypericum hypericoides, hypericum maculatum, hypericum perforatum, hypericum prolificum, hypericum pyramidatum, hypericum spathulatum, hypericum tetrapterum, hypericum virginianum