The predominantly blue/purple flowers of delphinium barbeyi
grow on the upper portion of the tall, unbranched stems, each borne at the end of a short stalk (pedicel) 2 inches long. Stems have a covering of glandular (sticky) hairs. A mature plant can have many dozen blooms. Flower heads are composed of five dark purple/blue sepals, one projecting backwards to form a spur, and four (sometimes five) much smaller petals. The lower two petals are purple, and are covered by long, thick, white hairs, while the upper pair of petals are pure white, or sometimes yellowish, and hairless.
The large green, alternate leaves are divided several times into thin, pointed lobes; they grow mostly around the base. The plant is highly toxic due to poisonous alkaloid compounds. White-flowered specimens are sometimes spotted. The upwards-pointing seed pods are green to purple and hairless, with black or purple spikes at the tip.