Jepson eFlora: Taxon page
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Aruncus dioicus var. acuminatus

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: AruncusView Description 

Common Name: GOAT'S BEARD

Species In Genus: 1 sp.: northern temperate North America, Europe. Etymology: (Latin: goat's beard, for inflorescence)
eFlora Treatment Author: T. Lawrence Mellichamp & Margriet Wetherwax

Aruncus dioicus (Walter) Fernald var. acuminatus (Rydb.) H. Hara
Habit: Perennial herb; rhizome stout; dioecious. Stem: 1--2 m, glabrous. Leaf: < 60 cm, 2--3-pinnately compound, petioled; stipules 0; leaflets 3--16 cm, ovate, acuminate, 2-serrate, +- hairy. Inflorescence: panicle, < 50 cm; pedicels < 1 mm, bractlet 1, at top. Flower: hypanthium saucer-shaped, bractlets 0; sepals 5, 1--2 mm; petals 5, 1--2 mm, oblong to obovate, white to pale +- yellow. Staminate Flower: stamens 15--30, exserted. Pistillate Flower: pistils 3(5), styles short. Fruit: follicles 3(5), 3--5 mm, +- cylindric, reflexed, adaxially dehiscent. Seed: +- 2 mm. Chromosomes: 2n=18.
Ecology: Moist streambanks, conifer or mixed-evergreen forest; Elevation: < 1900 m. Bioregional Distribution: NCo, KR, n NCoRO, CaR; Distribution Outside California: to Alaska. Flowering Time: Jun--Sep Note: Other varieties in eastern North America.
Synonyms: Aruncus acuminatus Rydb.; Aruncus dioicus var. pubescens (Rydb.) Fernald, misappl.
eFlora Treatment Author: T. Lawrence Mellichamp & Margriet Wetherwax
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botanical illustration including Aruncus dioicus var. acuminatus


Citation for this treatment: T. Lawrence Mellichamp & Margriet Wetherwax 2016. Aruncus dioicus var. acuminatus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 04, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 04, 2016.

Aruncus dioicus var. acuminatus
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© 2009 Barry Breckling

More photos of Aruncus dioicus var. acuminatus in CalPhotos

Geographic subdivisions for Aruncus dioicus var. acuminatus:
NCo, KR, n NCoRO, CaR;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.