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Eriogonum giganteum var. formosum

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: EriogonumView DescriptionDichotomous Key

Habit: Annual to shrub, matted or not. Stem: prostrate to erect, occasionally 0, glabrous or hairy, occasionally glandular. Leaf: basal, sheathing (on stem above basal, beneath other, +- non-sheathing cauline), or cauline, alternate, opposite, or whorled; blades linear to +- round, generally longer than wide, margins flat, wavy, or rolled under; ocreae 0. Inflorescence: variable, glabrous or hairy, occasionally glandular; peduncles 0 or erect to reflexed (pointed down); involucres 1 or in clusters, tubular, glabrous or hairy, teeth generally 4--10, awns 0. Flower: (2)6--100(200), with a stalk-like base ("flower stipe" or "stipe") or not; perianth generally white to red or yellow, glabrous or hairy, occasionally glandular, lobes 6, generally entire; stamens 9. Fruit: generally brown or black, generally obconic, glabrous or hairy; embryo curved or straight.
Species In Genus: +- 250 species: temperate North America. Etymology: (Greek: woolly knees, for hairy nodes of 1st sp. named) Note: One of largest genera in California; stem in descriptions refers to the main stem(s), not branches of inflorescence. A perennial herb allied to Eriogonum austrinum (S. Stokes) Reveal and Eriogonum moranii Reveal of east-central Baja California, with spreading (rather than reflexed or erect) involucres on peduncles < 2 mm, occurring in DMtns (Bristol, Granite mountains), has been known for nearly 25 years yet remains undescribed. Eriogonum puberulum moved to Johanneshowellia.
eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti
Species: Eriogonum giganteumView Description 

Habit: Shrub 3--20(35) dm. Stem: 1--4 dm, tomentose to +- glabrous. Leaf: cauline; blades 2--7(10) cm, 1--5 cm wide, tomentose to +- glabrous. Inflorescence: 5--30 cm, (2)5--50(80) cm wide; branches tomentose to +- glabrous; peduncles 0 or erect, 0.1--0.5 cm, slender, tomentose; involucres 3--5 mm, 2.5--4 mm wide, tomentose. Flower: 2--4 mm, hairy; perianth white to rose, lobes obovate. Fruit: 2--3.5 mm, glabrous.
Note: Other variety in northern Baja California. Hybridizes with Eriogonum arborescens, Eriogonum fasciculatum where cultivated on mainland.
Eriogonum giganteum S. Watson var. formosum K. Brandegee
Habit: Plant 3--15(25) dm. Stem: 2--4 dm, tomentose to +- glabrous. Leaf: blades 5--8 cm, 1--2 cm wide. Inflorescence: 10--50 cm wide; involucres 4--5 mm. Flower: 3--4 mm. Fruit: 3--3.5 mm.
Ecology: Gravel; Elevation: < 300 m. Bioregional Distribution: s ChI (San Clemente Island). Flowering Time: May--Sep
Synonyms: Eriogonum formosum (K. Brandegee) Brandegee; Eriogonum giganteum subsp. formosum (K. Brandegee) Raven
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

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Botanical illustration including Eriogonum giganteum var. formosum

botanical illustration including Eriogonum giganteum var. formosum


Citation for this treatment: James L. Reveal & Thomas J. Rosatti 2012, Eriogonum giganteum var. formosum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 23, 2022.

Citation for the whole project: Jepson Flora Project (eds.) 2022, Jepson eFlora,, accessed on May 23, 2022.

Eriogonum giganteum var. formosum
click for enlargement
© 2011 Dylan Neubauer
Eriogonum giganteum var. formosum
click for enlargement
© 2011 Neal Kramer
Eriogonum giganteum var. formosum
click for enlargement
© 2009 Steve Matson
Eriogonum giganteum var. formosum
click for enlargement
© 2011 Neal Kramer
Eriogonum giganteum var. formosum
click for enlargement
© 2011 Neal Kramer
Eriogonum giganteum var. formosum
click for enlargement
© 2011 Dylan Neubauer

More photos of Eriogonum giganteum var. formosum in CalPhotos

Geographic subdivisions for Eriogonum giganteum var. formosum:
s ChI (San Clemente Island).
1. You can change the display of the base map layer control box in the upper right-hand corner.
2. County and Jepson Region polygons can be turned off and on using the check boxes.
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.
View all CCH records
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.

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).