Plants photographed on Kyffhäuser
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Tribulus cristatus C.Presl

Tribulus cristatus


Family: Zygophyllaceae
Full name: Tribulus cristatus C.Presl
Location: Kyffhäuser (2416AD + 2416CB)
ID status: Fairly certain
Afrikaans common name(s): Duifiedoring
English common name(s): -
Synonym(s): -
Status: Native
Description: Leaflets in about 5 pairs, sub-equal, acute; peduncles in the axil of a 3–4 times shorter leaf; petals broad, cuneate, twice as long as the calyx; style short; stigma pyramidal; carpels with two marginal-crested, unequally spinulose wings; disc of the carpels prickly. Very near the preceding, and also hairy, but the hairs are stiffer, less dense and the colour is greener. Stipules acuminate, 2–3 lines long. Leaf an inch or more in length. Peduncles 0.5–1 inch long. Flowers large, the petals in some 6 lines, in others nearly an inch long. Carpels 3-seeded, emarginate at summit, the ripe 0.5 inch wide and high; the wings membranous, twice as wide as the disc, armed at the margin with spines, 0.5–2 lines long. Seeds oblong. (from JSTOR Global Plants website / Flora Capensis)

An annual, or possibly a biennial or perennial plant. Branches prostrate, radiating from the much branched rootstock, 12-100 cm long, usually again branched but not conspicuously so. Branches, stipules, leaves, peduncles and calyx, in fact all vegetative parts of the plant usually hirsute with bulbous-based bristly hairs ; internodes terete, striate, 0.5-6.0 cm long. Leaves unequal, the larger 1.5-6.5 cm long with 3-8 pairs of leaflets; the smaller (subtending a branch or flower) with 2-4 pairs of leaflets and much shorter than the first internode of the subtended branch, or the peduncle; stipules 2.5-8 mm long, obliquely lanceolate, acuminate, upper and lower surface hirsute or almost glabrous, with marginal bulbous-based hairs ; petiole hirsute or minutely pubescent, at times somewhat winged ; leaflets hirsute or glabrous except along the midrib above, hirsute and paler beneath, obliquely oblong, obtuse or acute, with marginal bulbous-based hairs, up to 14 mm long and 6 mm broad but usually much smaller. Pedicel 2.5-4 cm long, usually 2 to 3 times the length of the subtending leaf, striate, terete, set with tubercle-based hairs interspersed between a finer indumentum. Flower-buds abruptly acuminate. Sepals persistent, acuminate, 8-12 mm long. Petals broadly cuneate, up to 25 mm long, apparently always pale yellow in colour, twice or slightly more than twice as long as the sepals. Filaments up to 4 mm long, bearing anthers about 2 mm long. Style one-third to two-thirds as long as the stigma ; stigma conical-oblong, slender and 2-3.5 mm long. Disc at base of ovary a shallow cup formed bv the intergrowth of the intrastaminal glands. Mature fruits variable in size, glabrous except for a few bristle-like hairs, 6-25 mm long, 12-30 mm in diameter including the wings, finally breaking up into 5 cocci; cocci with lateral oblong rounded wings, dorsally ridged and set with tuberculate bristly hairs ; wings rounded, transversely markedly striate with marginal subrigid acute spines of unequal length often bearing an analogous spine dorsally from the centre of each wing near the body of the coccus, a character which appears to be unique and by which this species may readily be distinguished from all the other South African species. This spine may sometimes be intergrown with the wing and in such cases is less conspicuous. (An account of the South African species of Tribulus (Schwiekerdt, 1937))
Link(s) African Plant Database
JSTOR Plant Science
Kew Herbarium Catalogue
BGBM Berlin-Dahlem - Virtual Herbarium
Züricher Herbarien
iNaturalist (Namibia / Alex Dreyer)
iNaturalist (Namibia)
iNaturalist (southern Africa)
Flora of Zimbabwe
Fleurs de notre Terre - Galerie Namibie
Tree Atlas of Namibia
Photographer: AA Dreyer
Date of photograph: 03 Mar 2009
Camera make: Canon
Camera model: PowerShot A700
Lens aperture: f/4.0
Shutter speed: 1/250 s
ISO speed: -
Content last updated: 03 Oct 2022

Note: The identification of some of the plants on this website is not 100% certain. Any comments will be highly appreciated. I would also be willing to supply higher resolution images upon request. Please contact me at the e-mail address given below.

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Last updated 03 Oct 2022

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