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

    THIS PAGE IS NO LONGER UPDATED
    AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

ZYGOPHYLLACEAE

CALTROP FAMILY

Duncan M. Porter

Herb, shrub, often armed; caudex present or not
Stem branched; nodes often angled, swollen
Leaves 1-compound, opposite; stipules persistent or deciduous; leaflets entire
Inflorescence: flowers 1–2 in axils
Flower bisexual; sepals 5, free, persistent or deciduous; petals 5, free, generally spreading, sometimes twisted and appearing propeller-like; stamens 10, sometimes appendaged on inside base; ovary superior, chambers 5–10, ovules 1–several per chamber, placentas axile
Fruit: capsule or splitting into 5–10 nutlets
Genera in family: 26 genera, ± 250 species: widespread especially in warm, dry regions; some cultivated (Guaiacum, lignum vitae; Peganum, harmal (NOXIOUS and illegal); Tribulus, caltrop (pernicious)). Peganum harmala L. has been reported as a pernicious weed near Daggett, San Bernardino Co
Reference: [Porter 1972 J Arnold Arbor 53:531–552]

LARREA

CREOSOTE BUSH

Shrub, unarmed
Stem branched, erect to prostrate, < 4 m, reddish becoming gray; nodes swollen, darker; hairs 0 or appressed
Leaf: stipules persistent; leaflets 2, fused at base
Inflorescence: flowers solitary in axils
Flower: sepals deciduous, unequal, overlapping; petals clawed, twisted, propeller-like, yellow, deciduous; stamen appendages bract-like, coarsely toothed
Fruit 5-lobed, spheric, short-stalked, hairy, splitting into 5 hairy, 1-seeded nutlets
Species in genus: 5 species: warm, dry Am
Etymology: (J.A. Hernandez de Larrea, Spanish clergyman)

previous taxon | next taxon
bioregional map for LARREA being generated
 


Retrieve Jepson Interchange Index to Plant Names entry for Larrea
Retrieve dichotomous key for Larrea
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
Glossary


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