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Vascular Plants of California
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Horkelia rydbergii


Higher Taxonomy
Family: RosaceaeView DescriptionDichotomous Key
Common Name: ROSE FAMILY
Habit: Annual to tree, glandular or not. Leaf: simple to palmately or pinnately compound, generally alternate; stipules free to fused (0), persistent to deciduous. Inflorescence: cyme, raceme, panicle, cluster, or flowers 1; bractlets on pedicel ("pedicel bractlets") generally 0--3(many), subtended by bract or generally not. Flower: generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, subtending bractlets ("hypanthium bractlets") 0--5, alternate sepals; sepals generally 5; petals generally 5, free; stamens (0,1)5--many, anther pollen sacs generally 2; pistils (0)1--many, simple or compound, ovary superior to inferior, styles 1--5. Fruit: 1--many per flower, achene (fleshy-coated or not), follicle, drupe, or pome with generally papery core, occasionally drupe-like with 1--5 stones. Seed: generally 1--5 (per fruit, not per flower).
Genera In Family: 110 genera, +- 3000 species: worldwide, especially temperate; many cultivated for ornamental, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. Note: Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis.
eFlora Treatment Author: Daniel Potter & Barbara Ertter, family description, key to genera, treatment of genera by Daniel Potter, except as noted
Scientific Editor: Daniel Potter, Thomas J. Rosatti.
Genus: HorkeliaView DescriptionDichotomous Key


Habit: Perennial herb, generally +- glandular, generally resinous-smelling; caudex generally branched. Stem: generally ascending to erect. Leaf: generally basal, odd-1-pinnately compound, generally +- flat; cauline alternate, reduced upward; leaflets 2--15 per side, uppermost lateral generally +- fused with terminal. Inflorescence: cyme; pedicels generally straight, bractlets 0. Flower: hypanthium cup-like, +- flat-bottomed, width +- 2 × length, bractlets 5, generally 2/3 sepals; sepals often reflexed; petals generally +- = sepal, blunt, white; stamens 10, filaments +- flat, often forming a tube; pistils 2--many, ovary superior, style attached below fruit tip, +- thicker at base. Fruit: achene.
Species In Genus: 20 species: western North America. Etymology: (J. Horkel, German plant physiologist, 1769--1846) Note: Many attractive to bees; data apply to basal leaves, pressed hypanthia.
eFlora Treatment Author: Barbara Ertter
Reference: Ertter & Reveal 2007 Novon 17:315--325
Horkelia rydbergii Elmer
NATIVE
Habit: Plant +- matted, gray-green. Stem: 10--70 cm; hairs ascending to +- appressed. Leaf: 4--20 cm; stipules entire; leaflets 7--14 per side, separated or crowded, 5--15 mm, +- wedge-shaped, +- 5--10-toothed +- 1/3 to base, hairs generally dense. Inflorescence: +- open, generally 8--40-flowered; pedicels generally 2--8 mm. Flower: hypanthium width generally 2.5--4 mm, +- > 2 × length, inner wall +- hairy, bractlets 0.5--1 mm wide, +- lanceolate; sepals 3--5 mm; petals 4--5.5 mm, oblong to oblanceolate; filaments 0.5--2 mm, base 0.5--1 mm wide, anthers 0.6--1 mm; pistils generally 20--50, style generally 2--3 mm. Fruit: +- 1.2 mm. Chromosomes: 2n=28.
Ecology: Meadows, streambanks, under pines; Elevation: 1200--2800 m. Bioregional Distribution: TR. Flowering Time: Jun--Aug
Synonyms: Horkelia bolanderi A. Gray subsp. parryi (S. Watson) D.D. Keck
Jepson eFlora Author: Barbara Ertter
Reference: Ertter & Reveal 2007 Novon 17:315--325
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Citation for this treatment: Barbara Ertter 2012, Horkelia rydbergii, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=76858, accessed on June 19, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on June 19, 2019.

Horkelia rydbergii
click for enlargement
© 2005 Aaron Schusteff
Horkelia rydbergii
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© 2015 Keir Morse
Horkelia rydbergii
click for enlargement
© 2015 Keir Morse
Horkelia rydbergii
click for enlargement
© 2015 Keir Morse
Horkelia rydbergii
click for enlargement
© 2005 Aaron Schusteff
Horkelia rydbergii
click for enlargement
© 2015 Keir Morse

More photos of Horkelia rydbergii in CalPhotos



Geographic subdivisions for Horkelia rydbergii:
TR.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).





 

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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.