Flora of North America species comparison

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Horkelia congesta var. congesta

Horkelia congesta var. nemorosa
Photo is of parent taxon

Sierra horkelia
Photo is of parent taxon

Josephine horkelia, Sierra horkelia
Stems

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

± ascending, usually reddish, sometimes greenish, 1.5–3 dm, hairs 2 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.

(3–)4–8 × 1–2.5 cm;

leaflets 2–4 per side, lanceolate-elliptic to oblong, 5–12 × (1–)3–5(–6) mm, (1/4–)1/3–1/2 as wide as long.
Cauline leaves

3–7;

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

2–5;

stipules incompletely divided or divided no more than 2/3 into lanceolate, often acuminate teeth.
Inflorescences

composed of ± corymbiform clusters to capitate glomerules.

usually composed of ± 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.

epicalyx bractlets linear to narrowly elliptic, 1–2(–3) mm;

hypanthium 1/2 to nearly as deep as wide;

petals 2.5–3(–4) × (1.5–)2–3 mm;

styles 2–3 mm.

Horkelia congesta var. congesta

Horkelia congesta var. nemorosa
Phenology Flowering spring–summer. 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 Serpentine flats, openings of conifer woodlands
Elevation 80–700 m (300–2300 ft) 200–800 m (700–2600 ft)
Distribution
from FNA
OR
[BONAP county map]
from FNA
CA; 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.)

Of conservation concern.

Variety nemorosa occurs primarily in open ultramafic flats in the Illinois River Valley of southern Josephine County, Oregon; a single collection (Van Deventer s.n., CAS) from Shelly Creek in Del Norte County, California, also belongs to this variety. Plants from the head of Babyfoot Creek in Curry County (Leach 3006, OSC) are referable to var. nemorosa, although transitional to Horkelia tridentata var. flavescens; a collection from southwest of Waldo in Josephine County (Peck 8117, WILLU) also combines features of the two taxa.

The specimen cited by D. D. Keck (1938) from Douglas County, Oregon, is here referred to Horkelia tridentata var. tridentata; specimens cited from Jackson County, Oregon, are all intermediate with var. congesta.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 268. FNA vol. 9, p. 268.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Horkelia > sect. Tridentatae > Horkelia congesta Rosaceae > subfam. Rosoideae > tribe Potentilleae > Horkelia > sect. Tridentatae > Horkelia congesta
Sibling taxa
H. congesta var. nemorosa
H. congesta var. congesta
Synonyms H. hirsuta H. congesta subsp. nemorosa, Potentilla congesta var. nemorosa
Name authority unknown (D. D. Keck) M. Peck: Man. Pl. Oregon, 399. (1941)
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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