Plants photographed on Kyffhäuser
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Tribulus zeyheri Sond. subsp. zeyheri (1860)


Tribulus zeyheri subsp zeyheri

Flower



Family: Zygophyllaceae
Full name: Tribulus zeyheri Sond. subsp. zeyheri (1860)
Location: Kyffhäuser (2416AD + 2416CB)
ID status: Fairly certain
Afrikaans common name(s): Dubbeltjie, Diwiltjie, Geeldubbeltjie
English common name(s): Calthrop, Large-flowered devil-thorns, Yellow devil's thorn, Devil thorn weed, Puncture vine, Goat's head bur, Maltese cross, Devil's thorn, Common dubbeltjie, Small calthrop, Devil's eyelashes, Burnut
Synonym(s): -
Status: Native
Description: Flowers approx. 40 mm across.

Perennial herb with spreading prostrate or somewhat ascending branches, finely hirsute with longer scattered bristle-like bulbous-based hairs on all vegetative parts; branches up to 1.2 m long. Leaves unequal; the larger up to 9 cm long, with up to 9 pairs of leaflets; the smaller up to 5 cm long, with up to 4 pairs of leaflets. Leaflets 4–20 x 2–11 mm, oblique, very variable, oblong, oblong-ovate or ovate, acute or subacute, pubescent on both surfaces or glabrous above, often ciliate. Stipules up to 10 mm long, linear-lanceolate to obliquely ovate, ciliate. Peduncle 1.5 to 2 times as long as the subtending leaf. Sepals 5–10 (12) x 1.8–2 mm, linear-lanceolate, acute, densely pubescent. Petals bright yellow, 10–20 (25) mm long, up to 2.5 times the length of the sepals, broadly cuneate. Filaments 3–4 mm long, anthers (1.2) 1.5–2.5 (3) mm long. Style short; stigma 2–3 mm long, slender, pyramidal. Ovary with stiff bristle-like tubercule-based hairs. Intrastaminal glands connate, forming a shallow cup at the base of the ovary. Fruit breaking up into 5 cocci, each usually with 4 (sometimes 6) equal spines, or spines reduced to thick warts, tuberculate on the dorsal crest and often laterally compressed. (from JSTOR Global Plants website / Flora Zambesiaca)

Leaflets in 6–8 pairs, sub-equal, obtuse; peduncle in the axil of the 2–3 times shorter leaf; petals nearly thrice as long as the calyx; stigma pyramidal, twice as long as the short style; carpels with 4 spines and prickly at back. Nearly allied to the preceding, especially to var. ?., with which it agrees in the silky-canescent leaves and smaller fruits, but differs in the peduncles twice as long, larger petals and stigma. Stems weak, 1–2 feet long, villous or glabrescent. Stipules ovato-lanceolate. Leaves unequal, one uncial, the other (from whose axil the peduncle springs) thrice as short. Leaflets 1.5–2 lines long, green above. Peduncles uncial. Sepals ovato-lanceolate, appressedly silky. Petals cuneate, 5–6 lines long. Style twice or thrice as short as the stigma, stigma 1 line long. Fruit smaller than a pea; the spines mostly unequal, the larger nearly 0.5 line long; tubercles numerous, hard, acute or sub-spinulous, mostly hairy. (from JSTOR Global Plants website / Flora Capensis)
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: 13 Dec 2008
Camera make: Canon
Camera model: PowerShot A700
Lens aperture: f/4.0
Shutter speed: 1/200 s
ISO speed: -
Content last updated: 01 Jun 2020


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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