Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.



Staria S. Vanderpool

Annual, shrub, tree, ill-smelling
Leaves generally 1-palmate, generally alternate, generally petioled; stipules generally minute, often bristle-like or hairy; leaflets 3–7
Inflorescence: raceme, head, or flowers solitary, generally longer 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: generally capsule, septicidal; valves generally 2, deciduous, leaving septum (frame-like placentas) behind; pedicel generally ± reflexed to spreading
Genera in family: 45 genera, 800 species: widespread tropical to arid temp; some cultivated (Capparis spinosa , caper bush)
Reference: [Ernst 1963 J Arnold Arbor 44:81–93]
CA members placed in subfamily Cleomoideae. Alternate family name: Capparidaceae.


Species in genus: 1 sp
Etymology: (Greek: equal part)


I. arborea Nutt.


Shrub, profusely branched, generally 5–20 dm, minutely hairy
Leaf: petiole 1–3 cm; leaflets generally 3, 15–45 mm, oblong-elliptic
Inflorescence: raceme, 1–30 cm, terminal; pedicels 8–15 mm, thicker in fruit
Flower: sepals fused in basal half, 4–7 mm, ± entire, green; petals 8–14 mm, 4–5 mm wide, sessile, yellow; stamens 15–25 mm, yellow, anthers 2–2.5 mm; style 0.9–1.2 mm or pistil aborting in bud
Fruit: capsule, tardily dehiscent, 3–4 cm, inflated, oblong to ± spheric, smooth, leathery, light brown; valves 2–3; receptacle stalk-like, 1–2 cm, stout, reflexed
Chromosomes: 2n=34,40
Ecology: Common. Coastal bluffs, hills, desert washes, flats
Elevation: 0–1300 m.
Bioregional distribution: s Sierra Nevada Foothills, Tehachapi Mountain Area, San Joaquin Valley, Central Coast, South Coast, Channel Islands, Desert
Distribution outside California: to Baja California
Flowering time: Most of year
Synonyms: Cleome isomeris Greene
Varieties angustata Parish, globosa Coville , insularis Jeps. have been recognized based on fruit variation that may be loosely correlated with geography
Horticultural information: DRN, SUN, DRY: 8, 9, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24; IRR: 12, 13; STBL.

previous taxon | next taxon
bioregional map for ISOMERIS%20arborea being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Isomeris arborea
Retrieve dichotomous key for Isomeris
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page
  • This page is no longer being maintained.

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California