Jepson eFlora: Taxon page
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Cephalanthus occidentalis
CALIFORNIA BUTTON WILLOW

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: CephalanthusView Description 

Common Name: BUTTON BUSH
Habit: Shrub, small tree. Leaf: opposite or in whorls of 3; stipules not leaf-like. Inflorescence: head, dense-spheric, peduncled. Flower: calyx 4-lobed; corolla narrowly funnel-shaped; style thin, exserted, stigma +- spheric. Fruit: nutlets 2--4, dry, brown, wider distally.
Species In Genus: +- 17 species: warm-temperate America, Asia, southern Africa. Etymology: (Greek: head flower)

Cephalanthus occidentalis L.
NATIVE
Habit: Plant 2--10 m. Stem: young stems round, +- red, glabrous. Leaf: 7--20 cm, elliptic to ovate, petioled, glabrous in age. Inflorescence: 3--3.5 cm; peduncle 2.5--5 cm. Flower: corolla white or +- yellow, tube slender, lobes obtuse; stigma long-exserted.
Ecology: Lake, stream edges; Elevation: < 1000 m. Bioregional Distribution: se KR, NCoRI, SNF, c SNH, GV, reported from SCoRO, MP; Distribution Outside California: Arizona, eastern North America, Mexico, Central America. Flowering Time: May--Sep Note: If recognized taxonomically, California plants assignable to Cephalanthus occidentalis var. californicus Benth.
eFlora Treatment Author: Robert E. Preston & Lauramay T. Dempster
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botanical illustration including Cephalanthus occidentalis

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Citation for this treatment: Robert E. Preston & Lauramay T. Dempster 2016. Cephalanthus occidentalis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=18612, 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.


Cephalanthus occidentalis
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© 2014 Neal Kramer
Cephalanthus occidentalis
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© 2009 Neal Kramer
Cephalanthus occidentalis
click for enlargement
© 2014 Neal Kramer
Cephalanthus occidentalis
click for enlargement
© 2009 Neal Kramer
Cephalanthus occidentalis
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© 2009 Aaron Schusteff
Cephalanthus occidentalis
click for enlargement
© 2009 Aaron Schusteff

More photos of Cephalanthus occidentalis in CalPhotos


Geographic subdivisions for Cephalanthus occidentalis:
se KR, NCoRI, SNF, c SNH, GV, reported from SCoRO, MP;
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.