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Vascular Plants of California
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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.
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
Jepson eFlora Author: James L. Reveal & Thomas J. Rosatti
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
Listed on CNPS Rare Plant Inventory

Previous taxon: Sidotheca caryophylloides
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Botanical illustration including Sidotheca emarginata

botanical illustration including Sidotheca emarginata

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Citation for this treatment: James L. Reveal & Thomas J. Rosatti 2012, Sidotheca emarginata, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=82227, accessed on April 19, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on April 19, 2024.

Sidotheca emarginata
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©2014 Keir Morse
Sidotheca emarginata
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©2019 Aaron Schusteff
Sidotheca emarginata
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©2014 Keir Morse
Sidotheca emarginata
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©2017 Keir Morse
Sidotheca emarginata
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©2014 Keir Morse

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





 

Data provided by the participants of the  Consortium of California Herbaria.
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All markers link to CCH specimen records. The original determination is shown in the popup window.
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.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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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 (fruiting time in some monocot genera).