Jepson eFlora: Taxon page
Vascular Plants of California
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Poteridium annuum
WESTERN BURNET


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: PoteridiumView Description 



Species In Genus: 1 sp. Etymology: (Diminutive of Poterium)
eFlora Treatment Author: Daniel Potter & Barbara Ertter
Unabridged Reference: Kerr 2004 A phylogenetic and biogeographic analysis of Sanguisorbeae (Rosaceae), with emphasis on the Pleistocene radiation of the high Andean genus Polylepis. Ph.D. Dissertation Univ of Maryland.
Poteridium annuum (Nutt.) Spach
NATIVE
Habit: Annual, biennial, taprooted, nonglandular. Stem: generally ascending to erect, generally 10--70 cm. Leaf: alternate, odd-1-pinnately compound; basal withered at flower; largest cauline generally 3--12 cm; leaflets 4--7 per side, largest blade 5--20 mm, +- sessile, +- obovate-elliptic, lobes < 15, > 2/3 to midvein, linear. Inflorescence: spike, head-like, 5--35 mm, 5--10 mm wide, cylindric-ovoid, +- 10--50-flowered; peduncle 3--15 cm; pedicel bractlets 2, subtended by 1 bract, all 3 2--3 mm wide. Flower: bisexual; hypanthium urn-shaped, bractlets 0; sepals generally 4, 2--3 mm, ovate, green; petals 0; stamens generally 2, filaments thread-like; pistil 1, ovary superior, continuous to style at top, stigma +- bushy, exserted. Fruit: hypanthium enclosing achene, 2--4 mm, 4-angled, +- winged, hard, faces wrinkled. Chromosomes: 2n=14.
Ecology: Open, especially disturbed areas; Elevation: 225--1890 m. Bioregional Distribution: KR, CaRH, n&c SNH, n CCo, PR, MP; Distribution Outside California: to British Columbia, Montana. Flowering Time: Apr--Jul
Synonyms: Sanguisorba annua (Nutt.) Nutt. ex Torr. & A. Gray; Sanguisorba occidentalis Nutt. ex Torr. & A. Gray, inval.
Jepson eFlora Author: Daniel Potter & Barbara Ertter
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Botanical illustration including Poteridium annuum

botanical illustration including Poteridium annuum

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Citation for this treatment: Daniel Potter & Barbara Ertter 2012, Poteridium annuum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=39819, accessed on November 15, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on November 15, 2019.

Poteridium annuum
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© 2009 Neal Kramer
Poteridium annuum
click for enlargement
© 2009 Neal Kramer
Poteridium annuum
click for enlargement
© 2006 Steve Matson
Poteridium annuum
click for enlargement
© 2018 Steve Matson
Poteridium annuum
click for enlargement
© 2009 Neal Kramer
Poteridium annuum
click for enlargement
© 2018 Steve Matson

More photos of Poteridium annuum in CalPhotos



Geographic subdivisions for Poteridium annuum:
KR, CaRH, n&c SNH, n CCo, PR, MP
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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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Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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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.