Delphinium nuttallii A. Gray

Delphinium nuttallii has often been confused with D . menziesii ; it may be distinguished by consistently smaller flowers and usually more flowers per plant than in the latter. Interestingly, each species produces both blue-purple and yellowish flower colors, in separate populations.

Stems 20-60(-90) cm; base usually reddish, pubescent. Leaves mostly on proximal 1/2 of stem; basal leaves 0-2 at anthesis; cauline leaves 3-10 at anthesis; petiole 0.3-19 cm. Leaf blade round to reniform, 2-8 × 3-14 cm, pubescent; ultimate lobes 5-18, width 4-7 mm (basal), 1-5 mm (cauline), widest at middle or in proximal 1/2. Inflorescences 5-25(-40)-flowered, at least 2 times longer than wide; pedicel 1.5-4(-9) cm, puberulent; bracteoles 2-3 mm from flowers, green, linear, 4-6 mm, puberulent. Flowers: sepals bluish purple to yellowish, (± drab), often partly fading upon drying, puberulent, lateral sepals ± spreading, 8-11 × 3-6 mm, spurs straight, slightly ascending, 9-13 mm; lower petal blades ± covering stamens, 4-6 mm, clefts 0.5-2 mm; hairs well dispersed, mostly near margins and base of cleft, white to yellow or blue. Fruits 10-14(-18) mm, 3.5-4 times longer than wide, pubescent. Seeds wing-margined; seed coat cell surfaces smooth.

Delphinium nuttallii is a species of Delphinium native to Washington and Oregon (the Columbia River Gorge) of the western United States. Its common names include Nuttall's larkspur and Columbia larkspur.

Delphinium nuttallii là một loài thực vật có hoa trong họ Mao lương. Loài này được A.Gray mô tả khoa học đầu tiên năm 1887.