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RUBIACEAE MADDER FAMILY

Robert E. Preston & Lauramay T. Dempster, except as noted

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].
± 500 genera, 6000 species: worldwide, especially tropics; many cultivated, including Coffea, coffee; Cinchona, quinine; many ornamental. [Robbrecht & Manen 2006 Syst & Geogr Plant 76:85–146] Diodia teres Walter doubtfully in California. —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.
Unabridged references: [Dempster 1979 Fl California 4(2):1–47]

Key to Rubiaceae

DIODIA BUTTONWEED
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.
50 species: warm America, Africa. (Greek: thoroughfare, from habitats)

D. teres Walter ROUGH BUTTONWEED, POOR JOE
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.
Dry mesas, slopes, often sandy; 50 m. Sonoran Desert (se Imperial Co.); to eastern United States, Mexico. Doubtfully in California, 1 1880 collection from Yuma, Arizona/California border. Jun–Oct [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 2 2014
Citation for this treatment: [Author of taxon treatment] 2013. Diodia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=23008, accessed on Sep 2 2014

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Geographic subdivisions indicated for the distribution of Diodia teres 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.