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Ditaxis neomexicana

Higher Taxonomy
Family: EuphorbiaceaeView DescriptionDichotomous Key

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: DitaxisView DescriptionDichotomous Key

Habit: Annual to subshrub; sap clear; generally monoecious; hairs 0 or generally 2-branched, generally appressed. Stem: spreading to erect, 1--10 dm. Leaf: alternate, stipuled. Inflorescence: raceme, axillary; staminate flowers generally distal to pistillate flowers; axis appressed- to spreading-hairy; bracts entire. Staminate Flower: sepals 5, edges abutting in bud; petals 5; stamens 5--15, generally in 2 sets, some > others, filaments fused into a column, staminodes 0--3 at column tip. Pistillate Flower: sepals 5, overlapping in bud; petals 5; nectar disk +- dissected; ovary 3-chambered, styles 3, 2-lobed. Fruit: smooth. Seed: surface +- striate to pitted [net-like]; scar not appendaged.
Species In Genus: +- 50 species: tropics, warm temperate America. Etymology: (Greek: 2-ranked, from 2 sets of anthers)

Ditaxis neomexicana (Müll. Arg.) A. Heller
Habit: Annual or perennial herb. Stem: 1--3.5 dm, densely appressed-hairy. Leaf: 1--3.5 cm; stipules 1--1.5 mm, entire; blade lanceolate, +- hairy, entire to faintly toothed. Staminate Flower: sepals 2--2.5 mm; petals +- 2 mm, glabrous; stamen column +- 1 mm. Pistillate Flower: sepals 3--4 mm, abaxially hairy, margin +- entire; petals +- 2.5 mm, lanceolate, glabrous or appressed-hairy, hairs not exceeding petal tip; ovary stiff-hairy, styles free, lobe tips not expanded. Fruit: 3--4 mm. Seed: +- 2 mm, angled, pitted.
Ecology: Slopes, creosote-bush scrub; Elevation: < 1000 m. Bioregional Distribution: s edge DMoj, DSon; Distribution Outside California: to Texas, Mexico. Flowering Time: Mar--Dec
Synonyms: Argythamnia neomexicana Müll. Arg.
eFlora Treatment Author: Mark H. Mayfield & Grady L. Webster
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botanical illustration including Ditaxis neomexicana


Citation for this treatment: Mark H. Mayfield & Grady L. Webster 2016. Ditaxis neomexicana, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 31, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 31, 2016.

Ditaxis neomexicana
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© 2009 Keir Morse
Ditaxis neomexicana
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© 2009 Keir Morse
Ditaxis neomexicana
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© 1997 Christopher L. Christie
Ditaxis neomexicana
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© 2009 Keir Morse
Ditaxis neomexicana
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© 2010 Neal Kramer
Ditaxis neomexicana
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© 2010 Neal Kramer

More photos of Ditaxis neomexicana in CalPhotos

Geographic subdivisions for Ditaxis neomexicana:
s edge DMoj, DSon;
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.