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Eriogonum umbellatum var. subaridum

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
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 umbellatumView Description 

Habit: Perennial herb to shrub, (0.2)1--12(20) dm, (0.5)1--12(20) dm diam. Stem: (0.1)0.5--3(4) dm, tomentose to hairy or glabrous. Leaf: basal; blades 0.3--3(4) cm, 0.1--2.5 cm wide, tomentose or glabrous. Inflorescence: umbel-like (main branches of 1 order) or compound umbel-like (main branches of >= 2 orders), rarely head-like, 3--25 cm, 2--18 cm wide; branches tomentose to hairy or glabrous, rarely with bracts near middle of branches; involucres 1--6 mm, (1)1.5--10 mm wide, tomentose to hairy or glabrous; teeth 6--12, reflexed. Flower: 2--10(12) mm, stipe (0.7)1.3--2 mm, glabrous; perianth white, yellow or red, lobes generally spoon-shaped to obovate. Fruit: 2--7 mm, glabrous except sparsely hairy tip.
Note: Highly variable; many varieties outside California, to western Canada, Montana, Colorado, Arizona.

Eriogonum umbellatum var. subaridum S. Stokes
Habit: Subshrub or shrub, 2--7 dm, 3--9(12) dm diam. Stem: (0.5)1--3 dm, hairy or glabrous. Leaf: blades 1--3 cm, 0.5--2 cm wide, generally sparsely tomentose at least abaxially. Inflorescence: main branches of >= 2 orders, hairy or glabrous; involucre tubes 2--3(3.5) mm, teeth 1--3 mm. Flower: 3--7 mm; perianth yellow.
Ecology: Common. Sand or gravel; Elevation: 1200--3100 m. Bioregional Distribution: se SN, TR, SNE, DMtns; Distribution Outside California: to southwestern Colorado, northern Arizona. Flowering Time: Jun--Oct
Synonyms: Eriogonum biumbellatum Rydb.; Eriogonum ferrissii A. Nelson; Eriogonum umbellatum subsp. ferrissii (A. Nelson) S. Stokes; Eriogonum umbellatum subsp. subaridum (S. Stokes) Munz
eFlora Treatment Author: James L. Reveal & Thomas J. Rosatti
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botanical illustration including Eriogonum umbellatum var. subaridum


Citation for this treatment: James L. Reveal & Thomas J. Rosatti 2016. Eriogonum umbellatum var. subaridum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 06, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 06, 2016.

Eriogonum umbellatum var. subaridum
click for enlargement
© 2015 Steve Matson
Eriogonum umbellatum var. subaridum
click for enlargement
© 2015 Keir Morse
Eriogonum umbellatum var. subaridum
click for enlargement
© 2015 Keir Morse
Eriogonum umbellatum var. subaridum
click for enlargement
© 2010 James M. Andre
Eriogonum umbellatum var. subaridum
click for enlargement
© 2011 Steve Matson
Eriogonum umbellatum var. subaridum
click for enlargement
© 2011 Steve Matson

More photos of Eriogonum umbellatum var. subaridum in CalPhotos

Geographic subdivisions for Eriogonum umbellatum var. subaridum:
se SN, TR, SNE, DMtns;
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.
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.