Tribulus subramanyamii P. Singh, Giri & V. Singh in Bull. Bot. Surv. India 25: 147.(1983) 1985.

Herbs, annual, silky hairy; branches up to 40 cm long, striate. Leaves 4 - 6 cm long; leaflets elliptic to obovate, oblique, apiculate, 6 - 10,8 - 15 x 6 - 9 mm, sparsely or densely pubescent above, silky villous beneath; stipules falcate or linear to ovate, 3.5 - 4.5 x 1.5 - 3 mm. Flowers 10 - 15 mm across; pedicels ca 10 mm long. Sepals linear-lanceolate, acute, 5 - 7 x 1.5 - 2 mm. Petals obovate, cuneate, 6 - 8 x 5 - 5.5 mm. Stamens 10, ca 5 mm long; anthers oblong; intrastaminal glands free, almost triangular; extrastaminal glands thick, orbicular to oblong. Ovary ca 2.5 mm across; style ca 1.5 mm long; stigma pyramidal, 5-rayed. Schizocarps ca 15 mm across; mericarps dorsally ridged, ca 10 x 6 mm, appressed-silky hairy, greenish-yellow; spines 4 or sometimes lower pair reduced.

Fl. & Fr. July.

Distrib. India: Common weed of wastelands. Maharashtra, Andhra Pradesh, Karntaka and Tamil Nadu.

Endemic.

Notes. This species is allied to T. terrestris L. but differs mainly in presence of pubescent style and ciliate intrastaminal glands.

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