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Diodia teres
ROUGH BUTTONWEED, POOR JOE

Higher Taxonomy
Family: RubiaceaeView DescriptionDichotomous Key

Common Name: MADDER FAMILY
Habit: Annual to tree, vine. Leaf: generally opposite (whorled), entire; stipules generally fused to stem, adjacent pairs occasionally fused, or occasionally leaf-like and appearing like whorled leaves. Inflorescence: cyme, panicle, spike, cluster, or flower 1, generally terminal and +- axillary. Flower: generally bisexual; calyx +- 4(5)-lobed, occasionally 0 (Galium, Crucianella) or 6 (Sherardia); corolla generally radial, 4(5)-lobed; stamens epipetalous, alternate corolla lobes, generally included; ovary generally inferior, chambers generally 2 or 4, style 1(2). Fruit: drupe, berry, or 2 or 4 nutlets [capsule].
Genera In Family: +- 500 genera, 6000 species: worldwide, especially tropics; many cultivated, including Coffea, coffee; Cinchona, quinine; many ornamental. Note: Diodia teres Walter doubtfully in California.
eFlora Treatment Author: Robert E. Preston & Lauramay T. Dempster, except as noted
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: DiodiaView Description 

Common Name: BUTTONWEED
Habit: Annual. Leaf: opposite; stipules fused to leaf bases, small, fringed. Inflorescence: flowers 1--many in axils, sessile. Flower: corolla funnel-shaped, lobes generally 4. Fruit: nutlets 2; calyx persistent.
Species In Genus: 50 species: warm America, Africa. Etymology: (Greek: thoroughfare, from habitats)

Diodia teres Walter
WAIF
Stem: erect, branched or not, 7--25 cm, 4-angled. Leaf: 2.5 cm, lanceolate, tip sharp; stipule, blade base transparent, fringed, forming cup +- enclosing inflorescence. Flower: calyx lobes 4, stiff, unequal; corolla 3 mm, white or pink. Fruit: hairs stiff.
Ecology: Dry mesas, slopes, often sandy; Elevation: 50 m. Bioregional Distribution: DSon (se Imperial Co.); Distribution Outside California: to eastern United States, Mexico. Flowering Time: Jun--Oct Note: Doubtfully in California, 1 1880 collection from Yuma, Arizona/California border.
Synonyms: Diodia teres var. teres
eFlora Treatment Author: Robert E. Preston & Lauramay T. Dempster
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Citation for this treatment: Robert E. Preston & Lauramay T. Dempster 2016. Diodia teres, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=23008, accessed on May 03, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 03, 2016.


Geographic subdivisions for Diodia teres:
DSon (se Imperial Co.);
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.
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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.