Tessaria integrifolia Ruiz & Pav.

Tree or shrub to 10 m tall; twigs drying chocolate brown, puberulent, soon glabrescent. Leaves entire or denticulate, oblanceolate or elliptical, mucronulate, to 9 cm long, 2.5 cm wide, basally narrowed, apically acute, mucronulate, with ca. 5 pinnate veins on each side of the midvein, drying grey or yellowish green, canescent, ?glandular when young, glabrescent in age and then with a waxy, punctate patina of dense hairs; petiole 5-10 mm long. Inflorescence an open, cymose panicle, the pedicels slender, thickening in fruit, puberulent-pulverulent, the heads grouped in somewhat compacted clusters; bracts and bracteoles scale-like, broad, resembling the lowermost involucral bracts, appressed pubescent. Heads disciform ca. 4 mm long, campanulate; involucral bracts in 3-5 tightly appressed imbricate series, ochraceous, indurate, scarious margined, sparingly pubescent-pulverulent, the innermost lanceolate, glabrous, paleaceous, persistent, the outer series broad, deciduous except for the basal 2 or 3; receptacle conical, ca. 1 mm across, copiously tufted with bristlelike hairs, alveolate, the punctae well separated; ray florets many, the corolla capillary, ca. 3 mm long, basally expanded and lighter colored around the nectary, apically notched, sometimes with a rudimentary lobe or ligule, the style exserted for part of its united portion, the branches long exserted, linear, puberulent, basally with a small but distinct nectary of a lighter color than the style; disc floret solitary, much larger than the ray florets, the corolla tube short, the limb fusiform, divided halfway into acute lobes which are dorsally angled, with a large, 1-mn long, achene-like swelling around the nectary, this portion contracted apically, the base of the tube slightly expanded to give the appearance of a false nectary, the anthers basally sagittate, the adjacent tails united, entire, the pointed appendages not differentiated in texture, acute, exserted for half their length, the style with a large (1 mm long) basal, apically lobed nectary, the style branches not separating, exserted, uniformly cylindrical, much thicker than those of the ray flowers, apically capitate or not, short pubescent, the ovary rudimentary, minute, the pappus sturdy, of strigose bristles which recurve outwards and then upwards from the united base, much larger and sturdier than those of the ray flowers. Achenes (of ray flowers) light brown, ca. 0.5 mm long with somewhat irregular rounded angles; carpopodium prominent, lighter colored; pappus of nearly smooth white bristles, basally united and flaring.

It is a temperate plant. In Argentina it grows from sea level to 1,500 m above sea level.