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Oxytheca perfoliata

Higher Taxonomy
Family: PolygonaceaeView DescriptionDichotomous Key

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: OxythecaView DescriptionDichotomous Key

Habit: Annual, erect to spreading, glabrous or sparsely glandular. Leaf: basal, linear to narrow, awns 0; ocreae 0. Inflorescence: terminal, cyme-like; peduncles 0 or erect or reflexed; involucres 1, tubular, teeth (3)4, generally glabrous, awned. Flower: 2--10, glabrous or hairy and glandular; perianth white to rose or green-yellow, lobes 6, entire; stamens 9. Fruit: brown to maroon, generally elliptic, glabrous; embryo curved.
Species In Genus: 3 species: temperate western North America, southern South America. Etymology: (Greek: sharp case, for awned involucre) Note: Other taxa in TJM (1993) moved to Acanthoscyphus, Sidotheca.
eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti

Oxytheca perfoliata Torr. & A. Gray
Habit: Plant spreading, 0.6--2 dm, 0.5--4 dm diam. Leaf: blades 1--6 cm, 0.3--1.5 cm wide, glabrous, margins ciliate. Inflorescence: bracts 4--5, fused around node, 1--2.5 cm diam, glabrous or glandular, awns 1--3 mm; peduncles 0 or erect, 0.3--0.8 mm; involucre 2--5 mm, occasionally sparsely glandular, lobes 4, awns 2--3 mm, +- red. Flower: 5--10, 1.5--2.5 mm; perianth white to yellow-green or pink. Fruit: 1.5--2 mm. Chromosomes: n=20.
Ecology: Common. Sand or gravel; Elevation: 600--1900 m. Bioregional Distribution: s SnJV, GB, DMoj; Distribution Outside California: to southwestern Utah, northwestern Arizona. Flowering Time: Apr--Aug
Synonyms: Eriogonum perfoliatum (Torr. & A. Gray) S. Stokes
eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti
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botanical illustration including Oxytheca perfoliata


Citation for this treatment: James L. Reveal & Thomas J. Rosatti 2017. Oxytheca perfoliata, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 17, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora,, accessed on October 17, 2017.

Oxytheca perfoliata
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© 2014 Aaron Schusteff
Oxytheca perfoliata
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© 2012 Neal Kramer
Oxytheca perfoliata
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© 2014 James Morefield
Oxytheca perfoliata
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© 2014 Aaron Schusteff
Oxytheca perfoliata
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© 2008 Steve Matson
Oxytheca perfoliata
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© 2014 Aaron Schusteff

More photos of Oxytheca perfoliata in CalPhotos

Geographic subdivisions for Oxytheca perfoliata:
s SnJV, GB, DMoj;
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.
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.