Jepson eFlora: Taxon page
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon
Euphorbia exstipulata var. exstipulata
CLARK MOUNTAIN SPURGE

Higher Taxonomy
Family: EuphorbiaceaeView DescriptionDichotomous Key

Common Name: SPURGE FAMILY
Habit: Annual to shrub, tree [vine, cactus-like succulent]; monoecious or dioecious; sap clear or milky. Stem: generally branched [fleshy or spiny]. Leaf: generally simple, alternate to whorled, generally stipuled, sessile or petioled; blade entire, toothed, or lobed. Inflorescence: flowers solitary or in terminal or axillary cymes, racemes, spikes, or panicles, or (in Euphorbia) 1° inflorescence a compact, flower-like cyathium with much-reduced flowers enclosed within an involucre of fused bracts, cyathia terminal or axillary, 1 or in cyme-like arrays. Flower: unisexual, +- radial; sepals 0 or 2--6, free or fused; petals generally 0(5); stamens 1--many, free or filaments fused; ovary superior, chambers (1)3(4), styles free or fused, undivided, forked, or variously lobed. Fruit: generally capsule that splits into mericarps that then dehisce, releasing seeds. Seed: 1 per chamber; knob-like appendage sometimes present at attachment scar.
Genera In Family: 217 genera, 6000+ species: +- worldwide especially tropics; some cultivated (Aleurites, tung oil; Euphorbia species; Hevea, rubber; Ricinus). Toxicity: Many species +- highly TOXIC, due primarily to latex, especially if eaten or in contact with skin, eyes. Note: Eremocarpus moved to Croton, Tetracoccus moved to Picrodendraceae for TJM2; Chamaesyce moved to Euphorbia here (key to genera revised by Thomas J. Rosatti).
eFlora Treatment Author: Mark H. Mayfield & Grady L. Webster, except as noted
Scientific Editor: Bruce G. Baldwin.
Genus: EuphorbiaView DescriptionDichotomous Key

Common Name: SPURGE
Habit: Annual to shrub [tree; fleshy, +- cactus-like], glabrous or hairy; sap milky; generally monoecious. Stem: prostrate to erect, generally < 1 m; branches arrayed around main stem(s) in 3-dimensions or 2-ranked, resulting in 2-faced stems with adaxial leaf faces all displayed to top side and abaxial leaf faces to bottom side. Leaf: proximal cauline, alternate or opposite, +- sessile to petioled; distal-most cauline in some species whorled, subtending umbel-like cluster of inflorescence branches, leafy bracts distal to whorled leaves generally opposite (whorled); stipules 0, gland-like, thread-like, or scale-like, free or fused, entire to divided; blade entire or toothed (pinnately lobed), base symmetric or asymmetric. Inflorescence: 1° inflorescence a cyathium, resembling a flower; cyathia 1--many, stalked or sessile, terminal (axillary), in generally leafy-bracted cyme-like arrays; cyathium a compact unit comprising an involucre of 5 fused bracts enclosing 1--many reduced staminate flowers and 1(0) pistillate flower; involucre generally 1--5 mm, bract tips alternate with 1--5 nectary glands (derived from modified stipules of involucre bracts), these transversely crescent-shaped or oblong to +- round, flat to cup-like, entire, toothed, or with 2 horn-like lobes, with or without distal, white to pink or red, flat, petal-like appendages; bractlets within involucre membranous or thread-like, often fringed. Staminate Flower: (1--4)5--many, generally in 5 clusters around pistillate flower (this difficult to observe); calyx 0; each staminate flower a single stamen jointed to tip of a thread-like pedicel; pedicel persistent, stamen deciduous after pollen released. Pistillate Flower: (0)1, central, stalked; calyx 0; ovary chambers 3, styles 3, free or fused at base, undivided or +- deeply forked. Fruit: stalk generally elongating, generally curved, pushing developing fruit from involucre; capsule +- spheric to ovoid or oblong, in ×-section +- round to 3-lobed or -angled. Seed: +- round or +- 3- or 4-angled (flattened) in ×-section, smooth or sculptured; knob-like appendage at attachment scar present or 0.
Species In Genus: +- 1750 species: warm and/or dry temperate to tropics worldwide. Etymology: Euphorbus, physician to the King of Mauritania, 1st century Note: Forms monophyletic group with Chamaesyce, included here. Euphorbia serrata L. considered extirpated from California; 2003 report that Euphorbia exigua L. is possibly naturalizing as yet unconfirmed; Euphorbia marginata Pursh occasionally persisting from gardens, but recent records lacking. Euphorbia graminea Jacq. an urban weed. For fruit, seeds, "in ×-section" indicated only if not lobed or angled.
eFlora Treatment Author: David J. Keil, Thomas J. Rosatti, Mark H. Mayfield & Daryl Koutnik

Euphorbia exstipulata Engelm. var. exstipulata
NATIVE
Habit: Annual. Stem: erect, < 2.5 dm, puberulent, branches spreading or ascending. Leaf: opposite throughout, 4-ranked, 2--4 cm, +- petioled; stipules gland-like; blade linear to lanceolate, +- serrate, sparsely hairy, base symmetric, tapered, tip acute. Inflorescence: cyathia 1 per node, subtended by crowded distal leaves; involucre 1--2 mm, bell-shaped, puberulent; glands 4, < 0.5 mm, transversely oblong; petal-like appendage white, as wide as to wider than gland, 2--4-lobed. Staminate Flower: 8--14. Pistillate Flower: styles, forked > 1/2. Fruit: 2.5--3.4 mm, spheric, lobed, puberulent on lobes. Seed: 2--3 mm, pyramidal, 3-angled, transversely 2--3-ridged, tubercled; knob present.
Ecology: Rocky slopes; Elevation: 1800--2000 m. Bioregional Distribution: e DMtns (Clark Mtn Range, New York Mtns); Distribution Outside California: to Texas, Mexico. Other varieties in southwestern United States, Mexico. Flowering Time: Sep--Oct
eFlora Treatment Author: David J. Keil, Thomas J. Rosatti, Mark H. Mayfield & Daryl Koutnik
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

Previous taxon: Euphorbia eriantha
Next taxon: Euphorbia fendleri

Name Search

Contact/Feedback

Citation for this treatment: David J. Keil, Thomas J. Rosatti, Mark H. Mayfield & Daryl Koutnik 2016. Euphorbia exstipulata var. exstipulata, Revision 1, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=58994, accessed on May 06, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 06, 2016.


Euphorbia exstipulata var. exstipulata
click for enlargement
© 2012 Keir Morse
Euphorbia exstipulata var. exstipulata
click for enlargement
© 2012 Keir Morse
Euphorbia exstipulata var. exstipulata
click for enlargement
© 2012 Keir Morse
Euphorbia exstipulata var. exstipulata
click for enlargement
© 2012 Keir Morse
Euphorbia exstipulata var. exstipulata
click for enlargement
© 2012 Keir Morse
Euphorbia exstipulata var. exstipulata
click for enlargement
© 2012 Keir Morse

More photos of Euphorbia exstipulata var. exstipulata in CalPhotos


Geographic subdivisions for Euphorbia exstipulata var. exstipulata:
e DMtns (Clark Mtn Range, New York Mtns);
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.
READ ABOUT YELLOW FLAGS
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).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
View all CCH records

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.