Pterocaulon cordobense Kuntze

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

Pterocaulon cordobense Kuntze

Figure 35

Pterocaulon cordobense Kuntze (1898) : 169 — Cabrera (1963): 141;

Hurrell (2013): 190; Flora Argentina (2017); Tropicos (2017).

Hemicryptophytes, native with wide distribution in the Southern Cone Region of South America, previously recorded in Buenos Aires province but not in mountainous areas.

Characteristics. Perennial herb with brief xylopodium, to 80 cm tall, branches tomentouse to glabrous. Leaves with ovate to lanceolate shape, acute apex, dentate edge and decurrent base, giving the appearance of having winged stems. Abaxial surface of the leaves tomentouse; adaxial surface glabrous. Inflorescence: capitulums with numerous filiform outer florets and only 2 or 3 white tubu- lar disc florets. Achenes with glandular-pubescent surface.

Comments. This is a rare species in the study area. It grows in full sunlight conditions, on deep soils and in cracks of the slopes. It differs from other Pterocaulon species that grow in Buenos Aires province by being less than 100 cm tall, and by having dentage, oblanceolate leaves as well as inflorescence with branched spikes.