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Aconogonon davisiae

Higher Taxonomy
Family: PolygonaceaeView DescriptionDichotomous Key

Common Name: BUCKWHEAT FAMILY
Habit: Annual to shrub [tree]. Stem: nodes swollen or not. Leaf: simple, basal or cauline, generally alternate; ocreae present or 0, generally scarious, persistent or not. Inflorescence: flower clusters in axillary to terminal cyme-, panicle-, raceme-, spike-, umbel- or head-like arrangements, entire inflorescence or main inflorescence branches generally subtended by bracts ("inflorescence bracts"); peduncles present or 0; flower clusters in Eriogoneae-Eriogonoideae subtended by involucre of >= 1 free or +- fused, sometimes awn-tipped bracts ("involucre bracts") or, in Polygonoideae and rarely in Eriogonoideae, not (if bracts completely fused, involucre "tubular"); pedicels in Eriogoneae each often subtended by 2 free, transparent, linear bractlets or in Polygonoideae all subtended by 2+ fused, membranous, wide bractlets. Flower: generally bisexual, small, 1--200 per node; perianth parts 2--6, generally in 2 whorls, free or basally fused, generally petal-like, often +- concave adaxially, often darker at midvein, often turning +- red or +- brown in age; stamens [1]3 or 6--9 in 2 whorls; ovary superior, 1-chambered, ovule 1, styles 1--3. Fruit: achenes, included in or exserted from perianth, generally 3-angled, ovoid or elliptic, generally glabrous.
Genera In Family: 48 genera, +- 1200 species: worldwide, especially northern temperate; some cultivated for food (Coccoloba, sea-grape; Fagopyrum, Rheum, Rumex) or ornamental (Antigonon, lovechain; Coccoloba; Muehlenbeckia; Persicaria; Polygonum), a few timbered (Coccoloba; Triplaris). Several (Emex; Fallopia; Persicaria; Polygonum; Rumex) are weeds. Note: Treatment of genera in Eriogonoideae based on monographic work of James L. Reveal. Involucre number throughout is number (1--many) per ultimate grouping, at tips of ultimate branches; flower number is per flower cluster or involucre, unless otherwise stated. Fagopyrum esculentum Moench not naturalized, considered an historical waif (or garden weed +- presently), therefore not treated.
eFlora Treatment Author: Mihai Costea, except as noted
Genus: AconogononView DescriptionDichotomous Key

Habit: [Annual] perennial herb. Stem: ascending to erect, glabrous or hairy, ribs 0. Leaf: cauline, alternate, petioled or not; ocrea funnel-shaped, papery, persistent or not, glabrous to scabrous; blade narrowly lanceolate to ovate, entire. Inflorescence: axillary, terminal, raceme- or panicle-like; peduncle present or 0; pedicel present; flowers 1--5. Flower: bisexual, base stalk-like or not; perianth not enlarging, rotate, cream or green- to yellow-white or pink, glabrous, parts 5, fused +- 1/4, petal-like, +- of 2 kinds, outer 2 < inner 3, +- obtuse; stamens 8, filaments free, not wider basally, fused to perianth tube or not, glabrous, anthers ovate to elliptic, yellow to pink or red-purple; styles 3, erect to spreading, fused basally or not, stigmas head-like. Fruit: included or exserted, unwinged, 3-angled, yellow- or dark-brown, faces subequal. Seed: embryo generally curved.
Species In Genus: +- 25 species: western North America, Europe, Asia. Etymology: (Greek: ak, point, gone, angle, probably from 3-angled fruit)

Aconogonon davisiae (A. Gray) Soják
NATIVE
Stem: ascending to erect, 15--40(50) cm, glabrous to scabrous, branches from base. Leaf: ocrea 0.5--3 cm, +- brown, margins oblique, glabrous or scabrous; petiole 0.2--0.6(10) mm; blade 2.2--5 cm, 1--2.2 cm wide, lanceolate, ovate to broadly ovate, generally glaucous, +- glabrous to scabrous, yellow-green, base truncate to cordate, tip +- acute. Inflorescence: axillary, raceme-like; peduncle 0; pedicel 0.5--1.8 mm; flowers 1--5. Flower: perianth 2--4 mm, green-yellow to pink-white, lobes oblong-ovate to obovate. Fruit: exserted, 3.5--6(8) mm, 2.1--5 mm wide, ovate-oblong, yellow-brown, shiny. Chromosomes: 2n=20.
Ecology: Talus, rocky sites of snow accumulation; Elevation: 1500--2800 m. Bioregional Distribution: KR, NCoRH, CaRH, n&c SNH; Distribution Outside California: southern Oregon. Flowering Time: Jun--Aug
Synonyms: Polygonum davisiae A. Gray; Aconogonon davisiae var. glabrum (G.N. Jones) S.P. Hong
eFlora Treatment Author: Mihai Costea
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Citation for this treatment: Mihai Costea 2016. Aconogonon davisiae, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=11871, accessed on September 27, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on September 27, 2016.


Aconogonon davisiae
click for enlargement
© 2005 Steve Matson
Aconogonon davisiae
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© 2002 Gary A. Monroe
Aconogonon davisiae
click for enlargement
© 2005 Steve Matson
Aconogonon davisiae
click for enlargement
© 2005 Steve Matson
Aconogonon davisiae
click for enlargement
© 2002 Gary A. Monroe
Aconogonon davisiae
click for enlargement
© 2009 Barry Breckling

More photos of Aconogonon davisiae in CalPhotos


Geographic subdivisions for Aconogonon davisiae:
KR, NCoRH, CaRH, n&c SNH;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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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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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.