Delphinium subsect. Subscaposa
Bull. Torrey Bot. Club 63: 330. 1936.
Roots 3-8(-12)-branched at least 1 cm from stem attachment, (4-)10-30(-40) cm, fibrous, twisted, dry, thin threadlike segments apparent nearly entire length; buds minute. Stems 1(-3) per root, unbranched, elongation delayed 4-10 weeks after leaf initiation; base often narrowed, firmly attached to root; proximal internodes much shorter than those of midstem. Leaves basal and cauline, largest near base of stem, others often abruptly smaller on distal stem; basal petioles spreading, cauline petioles ascending; basal leaves more rounded and with fewer, wider lobes than cauline leaves. Inflorescences usually 4-8 flowers per 5 cm, ± open, cylindric to narrowly pyramidal, seldom less than 4 times longer than wide, spurs rarely intersecting rachis; pedicel spreading to ascending, usually less than 2 cm, rachis to midpedicel angle more than 30°; bracts markedly smaller, fewer lobed than leaves. Fruits erect. Seeds rectangular to crescent-shaped, 1.3-3.3 × 1.1-2.3 mm, not ringed on proximal end, ± wing-margined; seed coats usually lacking wavy ridges (present only in D. purpusii), cells brick-shaped (less than 3 times longer than wide), cell margins undulate or straight.
North America, possibly others in Asia.
Species 10+ (10 in the flora).
|1||Yellowish gland-based hairs present (at least apically) on pedicel; sepals reflexed.||> 2|
|1||Yellowish gland-based hairs usually absent from pedicel; sepals spreading or reflexed.||> 4|
|2||Sepals light blue to lavender.||Delphinium lineapetalum|
|2||Sepals rose to pinkish or yellow||> 3|
|3||Sepals magenta to rose.||Delphinium purpusii|
|3||Sepals yellow.||Delphinium xantholeucum|
|4||Cells of seed coat with undulate margins visible at 10×; mature fruits usually 3 or fewer times longer than wide.||> 5|
|4||Cells of seed coat with smooth margins visible at 10× (roughened in D.parryi); mature fruits usually more than 3 times longer than wide.||> 7|
|5||Sepals rarely reflexed; stems more than (50-)60 cm.||Delphinium gypsophilum|
|5||Sepals (especially laterals) usually reflexed; stems less than 60(-100) cm.||> 6|
|6||Lower petals white (contrasted with blue sepals).||Delphinium recurvatum|
|6||Lower petals blue or white to pink (same color as sepals).||Delphinium parishii|
|7||Sepals strongly reflexed.||Delphinium lineapetalum|
|7||Sepals spreading or slightly reflexed, not strongly reflexed.||> 8|
|8||Green leaves usually absent on proximal 1/5 of stem at anthesis; if present, then proximal portion of stem and/or petioles covered with short, arched hairs.||> 9|
|8||Green leaves usually present on proximal 1/5 of stem at anthesis; proximal portion of stem and petioles glabrous to nearly glabrous (straight hairs).||> 10|
|9||Lobes of proximal leaves less than 5 mm wide, or plants from less than 10km inland or less than 400m elevation.||Delphinium parryi|
|9||Lobes of proximal leaves 5 mm or more wide, and plants from more than 10km inland and greater than 400m elevation.||> 8|
|10||Leaves almost entirely on proximal 1/5 of stem at anthesis.||Delphinium scaposum|
|10||Leaves primarily cauline at anthesis.||> 11|
|11||Lobes of proximal leaves less than 4 mm wide; lateral sepals spreading to reflexed.||Delphinium andersonii|
|11||Lobes of proximal leaves at least 4 mm wide; lateral sepals spreading.||Delphinium umbraculorum|