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Sidotheca emarginata
WHITE-MARGINED OXYTHECA

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
Scientific Editor: Thomas J. Rosatti, Bruce G. Baldwin.
Genus: SidothecaView DescriptionDichotomous Key

Common Name: STARRY PUNCTUREBRACT
Habit: Annual, generally spreading, glabrous or glandular. Leaf: basal, linear to narrow, hairy, glandular, awns 0; ocreae 0. Inflorescence: terminal, cyme-like; peduncle erect to spreading; involucre 1, tubular, teeth 5(6), awned. Flower: 2--5(10), hairy, glandular; perianth white to rose or green-yellow to red, lobes 6, 3-lobed to fringed; stamens 9. Fruit: brown, obconic, glabrous; embryo curved.
Species In Genus: 3 species: western North America. Etymology: (Greek: star case, for involucre)
eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti

Sidotheca emarginata (H.M. Hall) Reveal
NATIVE
Habit: Plant 0.3--3 dm, 0.3--5 dm diam. Leaf: blades 1.5--7.5 cm, 0.4--1.5 cm wide. Inflorescence: bract awns 1--2 mm; peduncles erect, 0.5--3 cm, glandular; involucre 4--8 mm, 9--12 mm wide, glabrous, margin white, teeth 5, awns 1--1.5 mm, +- red. Flower: 3--6, (2)3--4.5(5) mm; perianth white to pink, lobes with 3--5 fringed linear lobes. Fruit: 1.8--2 mm.
Ecology: Gravel; Elevation: 1200--2500 m. Bioregional Distribution: e PR (SnJt, Santa Rosa Mtns, Riverside Co.). Flowering Time: Feb--Aug
Synonyms: Eriogonum emarginatum (H.M. Hall) S. Stokes; Oxytheca emarginata H.M. Hall
eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

Previous taxon: Sidotheca caryophylloides
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Citation for this treatment: James L. Reveal & Thomas J. Rosatti 2016. Sidotheca emarginata, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=82227, accessed on February 13, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 13, 2016.


Sidotheca emarginata
click for enlargement
© 2009 Thomas Stoughton
Sidotheca emarginata
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© 2014 Keir Morse
Sidotheca emarginata
click for enlargement
© 2014 Keir Morse
Sidotheca emarginata
click for enlargement
© 2014 Keir Morse
Sidotheca emarginata
click for enlargement
© 2014 Keir Morse
Sidotheca emarginata
click for enlargement
© 2009 Thomas Stoughton

More photos of Sidotheca emarginata in CalPhotos


Geographic subdivisions for Sidotheca emarginata:
e PR (SnJt, Santa Rosa Mtns, Riverside Co.).
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.
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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.