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CELASTRACEAE STAFF-TREE FAMILY

Michael A. Vincent & Barry A. Prigge

Shrub (climbing or not), tree, thorny or not, generally glabrous. Leaf: simple, opposite or alternate, deciduous to persistent, subsessile or petioled; veins pinnate. Inflorescence: cluster, cyme, raceme, panicle, or 1-flowered, axillary or terminal, bracted. Flower: generally bisexual, radial, small; hypanthium ± cup-shaped; sepals 4–5; petals (0)4–5, free; stamens 4–5, alternate petals, attached below or to rim of disk; ovary superior or ± embedded in disk, 2–5-chambered, placentas axile or basal, style generally 1, short, stigma ± head-like, 2–5-lobed. Fruit: capsule, winged achene, berry, drupe, or nutlet, often 1-chambered. Seed: generally 1 per chamber, arilled.
50 genera, 800 species: worldwide, especially southeastern Asia; some ornamental (Celastrus, Euonymus, Maytenus, Paxistima). [Zhang & Simmons 2006 Syst Bot 31:122–137] —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Brizicky 1964 J Arnold Arbor 45:206–234]

Key to Celastraceae

PAXISTIMA
Shrub, prostrate to ascending. Stem: twig 4-angled, with corky ridges. Leaf: opposite, evergreen, leathery, finely toothed. Inflorescence: axillary, 1–3-flowered. Flower: parts in 4s; petals ± white to red-brown; disk fused to hypanthium, ± square, fleshy; stamens short, attached to disk margin; ovary embedded in disk, stigma lobes 2, obscure. Fruit: capsule, loculicidal, 2-valved. Seed: shiny, dark brown to black; aril surrounding base and 1 side of seed, white, thin, fringed.
2 species: North America. (Greek: thick stigma, possibly)

P. myrsinites (Pursh) Raf. OREGON BOXWOOD
NATIVE
Plant 3–10 dm. Stem: prostrate to spreading, ± stiff, densely branched. Leaf: petiole ± 1 mm; blade 8–34 mm, ovate to oblanceolate, base tapered, tip rounded to acute. Inflorescence: peduncle 2–3 mm. Flower: petals ± 1 mm, ovate. Fruit: 4–7 mm, obovoid.
Shaded places; 180–2120 m. Northwestern California, Cascade Range, n&c Sierra Nevada, n San Francisco Bay Area (Marin Co.), Modoc Plateau; to British Columbia, Rocky Mountains, northern Mexico. May–Jul [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 22 2014
Citation for this treatment: [Author of taxon treatment] 2013. Paxistima, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=36518, accessed on Sep 22 2014

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click for enlargement Paxistima myrsinites
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© 2001 CDFA

Geographic subdivisions indicated for the distribution of Paxistima myrsinites 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.