Flora of North America species comparison

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Horkelia congesta var. congesta
Photo is of parent taxon

Sierra horkelia
Stems

± erect, usually greenish, rarely reddish, 3–5 dm, hairs 3 mm proximally.
Basal leaves

6–15 × 1.5–3 cm;

leaflets 3–6 per side, narrowly cuneate, 10–20 × 2–4(–6) mm, 1/5–1/3 as wide as long.
Cauline leaves

3–7;

stipules divided 3/4+ into linear to linear-lanceolate lobes.
Inflorescences

composed of ± corymbiform clusters to capitate glomerules.
Flowers

epicalyx bractlets linear to lanceolate, 2–3 mm;

hypanthium ± 1/2 as deep as wide;

petals (3–)4–6 × (2–)3–5 mm;

styles 1.5–2 mm.

Horkelia congesta var. congesta
Phenology Flowering spring–summer.
Habitat Wet to dry remnant prairies, generally near valley bottoms, or on balds of low hills in oak-conifer woodlands, generally on volcanic soil
Elevation 80–700 m (300–2300 ft)
Distribution
from FNA
OR
[BONAP county map]
Discussion

Of conservation concern.

Variety congesta is a component of the vanishing Willamette Prairie flora in western Oregon (T. N. Kaye, unpubl.). The variety has been extirpated from the northern part of its range in Marion, Polk, and Washington counties, and only isolated populations remain in the southern Willamette Valley, primarily in Lane County, and in the Umpqua Valley in Douglas County. A specimen from northern Josephine County (Beach 509, UC) is also referable to var. congesta, and two historic collections from the Rogue River Valley in Jackson County are intermediate between var. congesta and var. nemorosa.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 268.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Horkelia > sect. Tridentatae > Horkelia congesta
Sibling taxa
H. congesta var. nemorosa
Synonyms H. hirsuta
Name authority unknown
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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