Habit: Annual.
Stem: prostrate, spreading radially, generally < 1 m.
Leaf: even-1-pinnate; stipules +- leaf-like.
Inflorescence: flowers 1 in axils.
Flower: sepals deciduous; petals yellow, deciduous.
Fruit: 5-lobed, splitting into 5 nutlets, each with many tubercles, 2--4 stout spines; style deciduous; pedicel reflexed.
Seed: 3--5 per chamber.
Species In Genus: +- 12 species: especially dry Africa.
Etymology: (Latin: weapon used to impede cavalry, from armed fruit)
Jepson eFlora Author: Duncan M. Porter
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
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