Digitalis
Digitalis grandiflora
foxglove
yellow foxglove
erect, simple or branching from base, glabrous, glabrate, pilose, or villous.
50–100 cm, pilose to villous, hairs glandular and eglandular.
basal and cauline, alternate, smaller distally;
petiole absent [present];
blade not fleshy, not leathery, margins entire or serrate to coarsely doubly serrate.
blade lanceolate to oblanceolate, 10–21 × 2–4 cm, margins finely and evenly serrate distally, with a glandular tip.
terminal, racemes, often secund;
bracts present.
secund, glandular-pilose, bracts 20–30 mm.
present;
bracteoles usually absent.
pendent, 5–12 mm, glandular-pilose.
bisexual;
sepals 5, distinct, narrowly triangular to lanceolate or ovate-lanceolate, calyx ± bilaterally symmetric, campanulate;
corolla brown, yellow, pink to purple, or white, bilaterally symmetric, ± bilabiate, funnelform, tubular-funnelform, or globular to ovoid, tube base not spurred or gibbous, lobes 5, abaxial 3, adaxial 2;
stamens 4, adnate to corolla, didynamous, filaments glabrous or hairy;
staminode 0;
ovary 2-locular, placentation axile;
stigma 2-lobed or punctiform.
sepals narrowly lanceolate, 8–12 × 1.5–2 mm, villous;
corolla tube pale yellow, funnelform, 25–40 mm, throat 14–20 mm diam., abaxial lip pendent, pale yellow often marked by brown veins, broadly rounded to broadly triangular, 3–4 mm.
capsules, dehiscence septicidal, sometimes secondarily loculicidal.
ovoid, 8–11 mm, glandular-pilose.
20–60, brown to black, prismatic or cylindric to ovoid, wings absent.
brown to black, prismatic, 1 mm, finely reticulate-alveolate.
= 56 (Europe).
Digitalis
Digitalis grandiflora
Species 22 (4 in the flora).
All species of Digitalis are poisonous, containing cardiac glycosides including digitoxin. In addition to the following species, D. ferruginea Linnaeus is sometimes found in cultivation in North America. It has yellow to yellow-brown corollas, like D. lanata, but the corolla tubes are elongate, not globular.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Plants of Digitalis grandiflora are occasionally found in cultivation and sometimes escape in the northeastern part of the flora area.
Although the names Digitalis grandiflora and D. orientalis were published at the same time, D. grandiflora has long been the preferred name for this species and has been in general use since it was published. The name D. orientalis Miller was long confused with the later homonym D. orientalis Lamarck, a synonym of D. lanata.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Corolla tubes globular to ovoid; leaf blade margins entire. | D. lanata |
1. Corolla tubes funnelform or tubular-funnelform; leaf blade margins serrate or serrate at least distally. | → 2 |
2. Corolla tubes 13–15 mm; throats 5–7 mm diam. | D. lutea |
2. Corolla tubes 25–60 mm; throats 14–25 mm diam. | → 3 |
3. Corolla tubes pale yellow; leaf blade margins finely and evenly serrate distally. | D. grandiflora |
3. Corolla tubes purple-pink to white; leaf blade margins coarsely serrate. | D. purpurea |
CA
OR
WA
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
BC
Go Botany
MI Flora
MN Wildflowers
