Delphinium subsect. Virescens

M. J. Warnock

Phytologia 78: 85. 1995.

Treatment appears in FNA Volume 3.

Roots 2-8-branched, fusiform, fascicled, 3-8(-15) cm, ± fleshy; buds minute. Stems 1(-2) per root, usually unbranched, elongation delayed 4-16 weeks after leaf initiation; base not narrowed, firmly attached to root. Leaves basal and cauline, largest near base of stem, others often abruptly smaller on distal portion of stem; basal petioles spreading, cauline petioles ascending; basal leaves more rounded and with fewer, wider lobes than cauline leaves. Inflorescences usually with 3-8 flowers per 5 cm, ± dense, cylindric; pedicel appressed-ascending, usually less than 2 cm; bracts markedly smaller and fewer lobed than leaves. Fruits erect. Seeds crescent-shaped to obpyramidal, 1.5-2.5 × 0.8-1.8 mm, not ringed, not wing-margined; seed coats with prominent multicellular, transverse, wavy ridges, cells ± brick-shaped, cell margins straight.


North America, n Mexico.


Species 3 (3 in the flora).


1 Sepals white to lavender, reflexed; leaves grayish pubescent with short hairs. Delphinium wootonii
1 Sepals white to blue; if lavender, then not reflexed and leaves not grayish pubescent. > 2
2 Plants with combination of midcauline leaf blades round with at least 7 lobes more than 3/10 length of longest lobe; sepals dark to light blue; distalmost petiole immediately below inflorescence at least 1 cm long. Delphinium madrense
2 Plants deviating in at least one feature from combination above; sepals purple to blue to white; distalmost petiole immediately below inflorescence less than 0.5(–1) cm long. Delphinium carolinianum