Gutierrezia ameghinoi, Spegazzini, 1897

Ratto, Francisco & Bartoli, Adriana, 2015, The resurrection of Gutierrezia ameghinoi (Asteraceae, Astereae, Solidagininae), a species from Patagonia, Argentina, Phytotaxa 220 (3), pp. 295-300 : 299

Key to differentiate Gutierrezia ameghinoi from the co-occurring species

1. Plants erect, with linear or linear-elliptical leaves............................................................................................................. G. solbrigii

- Plants decumbent or prostrate, at times forming cushions, with broad leaves, spatulate or attenuated in a pseudo-petiole .............2

2. Leaves shortly attenuated into a pseudo-petiole, sheathing. Heads 15–20 mm in diam., solitary ............................ G. baccharoides

- Leaves distinctly attenuated in pseudo-petioles, non-sheathing. Heads less than 15 mm in diam., grouped ....................................3

3. Leaves widely spatulate, 10–25 × 2.5–6 mm. Involucre ovoid or ovoid-campanulate. Heads solitary or in cymes of 2–3 heads...... ........................................................................................................................................................................................ G. spathulata

- Leaves elliptic, 15–35 × 2–5 mm. Involucre cylindrical or cylindrical-turbinate. Cymes of numerous heads ............. G. ameghinoi