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CLEOMACEAE SPIDERFLOWER FAMILY

Robert E. Preston & Staria S. Vanderpool

Annual, perennial herb, shrub, often ill-smelling. Leaf: generally 1-palmate, generally alternate, generally petioled; stipules generally minute, often bristle-like or hairy; leaflets 0 or 3–7. Inflorescence: raceme, head, or flowers 1, expanded in fruit; bracts generally 3-parted below, simple above, or 0. Flower: generally bisexual, radial to ± bilateral; sepals generally 4, free or fused, generally persistent; petals generally 4, free, ± clawed; stamens generally 6, free, exserted, anthers generally coiling at dehiscence; ovary superior, generally on stalk-like receptacle, chamber generally 1, placentas generally 2, parietal, style 1, persistent, stigma generally minute, ± head-like. Fruit: 2 nutlets or generally capsule, septicidal; valves generally 2, deciduous, leaving septum (frame-like placentas) behind; pedicel generally ± reflexed to spreading.
17 genera, ± 150 species: widespread tropics to arid temperate. [Iltis & Cochrane 2007 Novon 17:447–451] Treated as Capparaceae in TJM (1993). —Scientific Editor: Thomas J. Rosatti.
Unabridged references: [Ernst 1963 J Arnold Arbor 44:81–93]

Key to Cleomaceae

OXYSTYLIS

1 sp. (Greek: sharp style)

O. lutea Torr. & Frém.
NATIVE
Annual, ± glabrous. Stem: branched from base, 5–15 dm. Leaf: petiole 2.5–7 cm; leaflets 3, 2–6 cm, ± elliptic, thick, firm. Inflorescence: axillary head, 0.5–3 cm, ± spheric, ± sessile, not elongating in fruit; pedicels 1–3 mm, thicker, reflexed in fruit. Flower: radial; sepals free, 1–2 mm, lanceolate, green; petals 2–3 mm, elliptic, straw-yellow, ± sessile; stamens 3–5 mm, yellow, anthers 1–1.2 mm; ovary 1–1.5 mm, ± sessile, lobes 2, ± separate, each 1-ovuled, style 2–3 mm, wide, fleshy at base. Fruit: 2 nutlets, each 2.5 mm, ± spheric, smooth, white to deep purple; receptacle < 2 mm, ± stalk-like; style 4–11 mm, stout, spine-like. Seed: 1 per nutlet.
2n=20,40. Desert wash, alkaline sink scrub, alkaline flats, in sandy or alkaline soil; < 945 m. n&e Mojave Desert; western Nevada (Amargosa Desert). Mar–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 23 2014
Citation for this treatment: [Author of taxon treatment] 2013. Oxystylis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=35724, accessed on Sep 23 2014

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click for enlargement Oxystylis lutea
See CalPhotos for additional images
2005 Aaron Schusteff

Geographic subdivisions indicated for the distribution of Oxystylis lutea 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.