This image from my ppt slide has pictures of 3 species of Tribulus. They are distinct in general morphology, style, fruits, thorns, indumentum, leaves etc. as you can see in the pictures. Reproducing the key here: A simple macroscopic key to distinguish the 3 southern indian species : 1. Style absent or very short (< 0.5 mm long) — Tribulus terrestris 1. Style present, 1.5-2 mm long —- 2 2. Style glabrous —- Tribulus lanuginosus (syn. of Tribulus terrestris var. bicornutus (Fisch. & C. A. Mey.) Hadidi) 2. Style pubescent —— Tribulus subramanyamii Hope this gives some clarity in id of these 3 spp. Look forward to your comments/observations. Really useful information sir. Thank you very much for sharing and throwing light on this species complex. . . Taxonomic Status of Some of the Tribulus Species in the Indian Subcontinent by Varghese, M.; Yadav, S.S. & Thomas, J. Saudi Journal of Biological Sciences 13 (1) 7-12: 2006 (keys)– A provisional key for the determination of Tribulus L. in India 1. Mericarps winged 2 1+ Mericarps spiny or unarmed or look-like unarmed 3 2. Stamens usually 5; wings of mericarps 2-4 mm wide or represented by small spinules at the base of the mericarps; margin of the wing much dentate … T. pentandrus 2+ Stamens 8-10; wings of mericarps 6-10 mm wide; margin shortly or shallowly few dentate. … T. macropterus 3. Flowers smaller, 5-15 mm wide 4 3+ Flowers larger, 25-40 mm wide. … T. cistoides 4. Mericarps with two lateral spines and 20-25 unequal spines spreading throughout … T. terrestris var. rajasthanensis 4+ Mericarps with 2 lateral spines and two basal spines or the basal spines absent. 5 5. Style puberulous, intra staminal glands connate and ciliated. … T. subramanyamii 5+ Style glabrous, intra staminal glands free, not cilated 6 6. Flowers 5-7 mm wide; Stamens 5-8; fruit 6-8 mm in diameter including spines; lateral spines 1.5-3 mm long; basal spines small or reduced to tubercles. … T. parvispinus 6+ Flowers 7-15 mm wide; Stamens usually 10; fruit 9-15 mm in diameter including spines; lateral spines5-8 mm long; basal spines 3-5 mm long. … T. terrestris . Taxonomic Status of Some of the Tribulus Species in the Indian Subcontinent by Varghese, M.; Yadav, S.S. & Thomas, J. Saudi Journal of Biological Sciences 13 (1) 7-12: 2006 (Details with keys– Tribulus parvispinus C.Presl, . . . . . Species with description & keys in Flora of China (Distribution other than China): Tribulus cistoides Linnaeus [throughout tropics] Tribulus terrestris Linnaeus [almost worldwide]
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Tribulus
Updated on December 24, 2024