Jepson Interchange (more information)
Print edition is available from the University of California Press
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This page is based on the 1993 Jepson Manual.
Please see the Jepson eFlora for up-to-date information about California vascular plants. |
| Jepson Flora Project: Jepson Interchange |
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TREATMENT FROM THE JEPSON MANUAL |
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Jepson Interchange (more information) |
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©Copyright 1993 by the Regents of the University of California
Print edition is available from the University of California Press |
| The second edition of The Jepson Manual (2012) is available from the University of California Press | |
| See also the Jepson eFlora, which parallels the Second Edition |
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]
Annual
Stem prostrate, spreading radially, < 1 m
Leaf even-1-pinnate; stipules ± leaf-like
Inflorescence: flowers solitary in axils
Flower: sepals deciduous; petals yellow, deciduous
Fruit 5-lobed, splitting into 5 nutlets, each with 2–4 stout spines; style deciduous; peduncle reflexed
Seeds 3–5 per chamber
Species in genus: ± 12 species: especially dry Africa
Etymology: (Greek: caltrop, weapon used to impede cavalry, from armed fruit)
| Introduced |
Stem ± silky or appressed-hairy, sharply bristly to glabrous
Leaf: stipules 1–5 mm; leaflets 6–12
Flower < 5 mm wide; peduncle < subtending leaf
Fruit 5 mm, < 1 cm wide, ± flat, hairy, gray or yellowish; spines 4–7 mm, spreading, hairy to glabrous
Ecology: Roadsides, railways, vacant lots, other dry, disturbed areas
Elevation: generally < 1000 m.
Bioregional distribution: California
Distribution outside California: to Wyoming, e US, c Mexico; native to Mediterranean
Flowering time: Apr–Oct
First collected in CA in 1902; long a pernicious weed, now controlled by introduced weevils.TOXIC to livestock in vegetative condition, fruits cause mechanical injury .
| 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). |
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