Aureolaria grandiflora

(Bentham) Pennell

Rhodora 20: 135. 1918

Common names: Large-flower yellow false foxglove
Endemic
Basionyms: Gerardia grandiflora Bentham Compan. Bot. Mag. 1: 206. 1836
Synonyms: Aureolaria grandiflora var. cinerea Pennell A. grandiflora var. pulchra Pennell A. grandiflora var. serrata (Bentham) Pennell G. grandiflora var. cinerea (Pennell) Cory G. grandiflora var. pulchra (Pennell) Fernald
Treatment appears in FNA Volume 17. Treatment on page 558. Mentioned on page 556.
Perennials. Stems simple or branched, 5–15 dm, white-puberulent. Leaves: petiole 8–18 mm; blade lanceolate, 50–105 x 30–40 mm, margins pinnatifid and serrate, rarely serrate and not pinnatifid, surfaces puberulent. Bracts leaflike, 15–22 x 3–7 mm, margins serrate to weakly pinnatifid at base. Pedicels 4–11 mm, puberulent. Flowers: calyx puberulent, tube campanulate, 6–10 mm, lobes linear to lanceolate, 3–12 x 1–4 mm, margins entire; corolla tube 30–40 mm, glabrous, lobes 7–11 x 10–16 mm; filaments 13–27 mm, ciliate; style 29–35 mm. Capsules pyriform, 10–16 x 8–12 mm, glabrous.

Phenology: Flowering Jul–Oct.
Habitat: Maple, pine, and oak woodlands, roadsides.
Elevation: 0–400 m.

Distribution

Ont., Ark., Ill., Ind., Iowa, Kans., La., Mo., Okla., Tex., Wis.

Discussion

J. C. McFeeley and E. P. Roberts (1974) documented Aureolaria grandiflora, typically a parasite of oaks, parasitizing Juniperus virginiana in addition to oak species. F. W. Pennell (1935) recognized four infraspecific taxa within A. grandiflora, differentiated on subtle characteristics (for example, bract margins serrate versus more deeply cut, leaf blade margins more versus less pinnatifid). Additionally, he recognized these infraspecific taxa at both the varietal and subspecific ranks (at different times). No infraspecific taxa are recognized here.

There is a historic record of Aureolaria grandiflora from Houston County, Minnesota, collected in 1899.

References

None.

Lower Taxa

No lower taxa listed.