Perennial, erect or ascending; stems with purple tinge; leaves in sub equal pairs, linear-lanceolate, subacute or obtuse, slightly pubescent; flowers in axillary, solitary, white, ovoid to globose, sessile heads; tepals 5, sepaloid, free, equal or unequal, glabrous, 3 nerved at base; stamens 3, anthers 1-celled, filaments distinctly connate at the base, interposed with pseudo staminodes as long as stamens, laciniate; ovary 1-celled with solitary, pendulous ovule, style short, stigma capitate; utricle indehiscent, thin walled, enclosed within persistent tepals; seeds lenticular, coriaceous.