Hieracium tandilense Sleumer

Echeverría, María L., Alonso, Sara I. & Comparatore, Viviana M., 2017, Survey of the vascular plants of Sierra Chica, the untouched area of the Paititi Natural Reserve (southeastern Tandilia mountain range, Buenos Aires province, Argentina), Check List 13 (6), pp. 1003-1036 : 1027-1028

Hieracium tandilense Sleumer

Figure 37

Hieracium tandilense Sleumer (1956) : 97 — Cabrera (1963): 432; Flora

Argentina (2017); Tropicos (2017).

Cryptophytes; endemic to mountain ranges of Buenos Aires province. Critically Endangered, reasons unknown ( Delucchi 2006).

Characteristics. Perennial herb with latex; rhizomes erect; stems ramified and lanose, to 60 cm tall. Leaves in a basal rosette, with lanceolate shape, ca 12 cm long, 3 cm in diameter, caulinar leaves smaller and without rigid or stiff bristles. Inflorescence: discoid capitulums with yellow florets in a cymose-corymb inflorescence. The phyllaries have lanuginose hairs mixed with black, short, soft, glandular hairs. Black-red achenes crowned by a light brown pappus.

Comments. This is a rare species in the study area. It grows in full sunlight conditions in cracks at the summit. Hieracium palezieuxii Zahn and H. burkartii Sleumer also occur in the region but H. palezieuxii presents rigid and stiff bristles on the stems and leaves, while H. burkartii has rigid bristles on the phyllaries.