grows along the northern Front Range and slightly eastward onto the plains. Dense
clusters of stems give the plant a bushy appearance in its vegetative stage. Leaves
are deeply dissected.
Compare to Delphinium nuttallianum,
which grows in similar habitats. D. nuttallianum begins flowering slightly
earlier in the season. D. nuttallianum plants are less dense, appearing
spindly with few stems and fewer leaves. Flowers of D. nuttallianum are
often a deep blue-purple compared to the purer blue of D. geyeri. Racemes
of D. geyeri tend to be longer with more flowers.