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Tribulus L. Search in The Plant ListSearch in IPNISearch in Australian Plant Name IndexSearch in Index Nominum Genericorum (ING)Search in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Species Plantarum 1: 386. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: About 20 species; chiefly distributed in tropical and subtropical countries throughout the world. It is represented by 4 species in Pakistan.

 

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Annual to perennial, prostrate to decumbent, pubescent to glabrescent herbs. Leaves opposite or alternate due to abortion of one leaf, abruptly paripinnate; stipules lanceolate to subulate; leaflets 3-10 pairs, opposite, shortly petiolulate to sessile, oblique, oblong to ovate or elliptical. Flowers solitary, axillary or pseudoaxillary, pedicellate, actinomorphic, yellow, rarely white; disc annular, fleshy, 10-lobed. Sepals 5, free, pubescent, caducous or persistent. Petals 5, free, spreading, obovate, fugaceous. Stamens 10 in 2 whorls, rarely 5, inserted at the base of the disc, 5 antisepalous ones shorter, filaments unappendaged, anthers oblong. Carpels 5; ovary sessile, ovoid or globose, beset with long silky hairs, 5-loculed, each locule with 2-5(-10) obliquely pendulous superposed ovules in axile placentation; style stout, 5-ridged, stigma 5-rayed. Fruit Schizocarpic, winged or spinous, pubescent, septicidally dehiscent into 5, triangular, indehiscent indurated, trans¬versely locellate 1-seeded mericarps. Seeds exalbuminous.
 

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1 Fruit pyramidal; mericarps neither winged nor spinous
+ Fruit discoid; mericarps winged or spinous (rarely spines reduced or suppressed) (2)
2 (1) Fruit with winged mericarps (3)
+ Fruit with spinose mericarps (spines sometimes reduced to tubercles) (5)
3 (2) Wings of mericarps 8-15 mm broad, glabrous, straw yellow Tribulus longipetalus subsp. pterophorus
+ Wings of mericarps less than 8 mm broad, pubescent, greyish-green (4)
4 (3) Flowers 6-8 mm across; Petals 3-4 mm long. Wings of mericarps 4 mm or less broad Tribulus longipetalus subsp. longipetalus
+ Flowers 10-12 mm across. Petals 5-6 mm long. Wings of mericarps 4-8 mm broad Tribulus longipetalus subsp. macropterus
5 (2) Leaves more than 2.5 cm long. Flowers more than 10 mm or more in diameter Tribulus terrestris
+ Leaves up to 2.5 cm long. Flowers 8-10 mm across. stamens mostly 5 (rarely up to 10). Fruit c. 8 mm in diameter Tribulus pentandrus
 
 
 
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