Flora of North America species comparison

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Horkelia sect. Capitatae
Habit Plants forming tufts or open mats, green or reddish, rarely grayish, conspicuously glandular, resinously aromatic.
Stems

ascending to erect, (0.6–)1–6(–9) dm.
Basal leaves

planar;

stipules entire;

leaflets 3–8(–15) per side, separate, sometimes ± overlapping, divided 1/5–3/4+ to midrib into (3–)5–15 teeth or lobes not restricted to apex.
Inflorescences

open to ± congested, flowers usually arranged in ± capitate glomerules, arranged individually in H. fusca var. filicoides.
Pedicels

remaining ± straight, outermost sometimes ± reflexed in congested inflorescences, 1–3(–10) mm.
Flowers

epicalyx bractlets linear, 0.2–0.3(–0.5) mm wide, entire;

hypanthium interior glabrous;

sepals acute to acuminate;

petals white to pale pink, often veined with pink to rose, ± oblanceolate to cuneate, apex emarginate to truncate or rounded;

filaments white, glabrous, anthers longer than wide;

carpels 10–25.
Achenes

1–1.8 mm, smooth.

Horkelia sect. Capitatae
Distribution
w United States
Discussion

Species 1.

Rydberg recognized seven species in his group Capitatae, treated here as intergrading variation within a single species. Plants of the section share the characteristic Horkelia odor, glandularity, and planar leaves of sect. Horkelia, but differ in the combination of relatively small, short-pedicelled flowers that (except for var. filicoides) are most commonly aggregated into one or more capitate, purple-suffused glomerules, with linear epicalyx bractlets, oblanceolate-cuneate petals that are often pink-tinged, and relatively short, broad filaments.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 259.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Horkelia
Subordinate taxa
Synonyms H. unranked Capitatae, Potentilla section Capitatae
Name authority (Rydberg) O. Stevens: in N. L. Britton et al., N. Amer. Fl. 22(7): 7. (1959)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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