Flora of North America species comparison

The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

Horkelia congesta var. congesta

Rosaceae subfam. rosoideae
Photo is of parent taxon

Sierra horkelia
Habit Herbs, shrubs, or subshrubs.
Stems

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

Leaves

alternate, rarely opposite, pinnately compound, sometimes simple or palmately compound;

stipules present, rarely absent.
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.

torus usually enlarged, sometimes small or absent;

carpels 1–260(–450), distinct, free, styles distinct, rarely connate (Roseae);

ovules 1(or 2), collateral (Rubeae) or superposed (Fallugia, Filipendula).
Fruits

achenes or aggregated achenes sometimes with fleshy, urn-shaped hypanthium or enlarged torus, sometimes aggregated drupelets;

styles persistent or deciduous, not elongate (elongate but not plumose in Geum).
x

= 7(8).

Horkelia congesta var. congesta

Rosaceae subfam. rosoideae
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]
North America; Mexico; Central America; South America; West Indies; Bermuda; Eurasia; Africa; Atlantic Islands; Indian Ocean Islands; Pacific Islands; Australia
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.)

Variation in the number of genera in subfam. Rosoideae is due to differences in generic delimitation between D. Potter et al. (2007) and the authors of some Potentilleae genera. Cyanogenic glycosides and sorbitol are absent in the subfamily.

Tribes 6, genera 28–35, species ca. 1600 (6 tribes, 26 genera, 302 species, including 1 hybrid, in the flora)

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 268. FNA vol. 9, p. 23. Author: Luc Brouillet.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Horkelia > sect. Tridentatae > Horkelia congesta Rosaceae
Sibling taxa
H. congesta var. nemorosa
Subordinate taxa
Synonyms H. hirsuta
Name authority unknown Arnott: Botany, 107. (1832)
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).



Type/paste one or more Latin names into the boxes above; matching taxa will show up below the box as you type. You can use the up/down arrow keys to move through the list.

(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Apiaceae, Boraginaceae, and Polemoniaceae.)

Choose a data source: Flora of North America, OregonFlora

The species comparison tool is brought to you by:
Northwest Wildflowers