Aristolochia guillermoi (Aristolochiaceae), a new species from Peru and a key to identify the Aristolochia taxa with branched trichomes Author González, Favio 0000-0001-5716-9278 Universidad Nacional de Colombia, Facultad de Ciencias, Instituto de Ciencias Naturales, Sede Bogotá, Colombia fagonzalezg@unal.edu.co Author Esquerre-Ibañez, Boris 0000-0003-2283-8106 Universidad Nacional Pedro Ruíz Gallo, Lambayeque, Peru besquerre@unprg.edu.pe text Phytotaxa 2025 2025-08-28 716 2 145 153 https://doi.org/10.11646/phytotaxa.716.2.7 journal article 312343 10.11646/phytotaxa.716.2.7 d0263881-9fa7-414d-b97e-45cbf6aa178e 1179-3163 17110788

TABLE 1. Comparison of the geographic distribution and diagnostic characters of leaves, flowers, fruits and seeds between Aristolochia guillermoi and its closest relative A. andina.

	Aristolochia guillermoi	Aristolochia andina
Leaf lamina	Chartaceous, glaucous beneath; venation prominent and densely reticulate beneath; apex obtuse	Membranaceous, not glaucous beneath; venation prominulous to plane beneath; apex acute
Pseudostipules	Triangular, 3–4 × 2–2.5 mm	Broadly ovate, 4–8 × 3–6 mm
Utricle	13–15 × 12–13 mm	8–12 × 4–5 mm
Syrinx	1.5–2 mm long	ca. 0.5 mm long
Tube	16–24 mm long; proximal diameter 4–5 mm; distal diameter 10–14 mm	6–12 mm long; proximal diameter 2–4 mm; distal diameter 5–8 mm
Limb	Widely ovate, 8–14 mm long; apex obtuse to emarginate	Ovate, 14–20 mm long; apex acute to obtuse, sometimes mucronulate
Capsule	35–44 × 15–20 mm	Ca. 30 × 12–15 mm
Seeds	5–6 × 5–6 mm, wingless, adaxially smooth	4–5 × 4–5 mm, with a vestigial wing ca. 0.5 mm wide, adaxially warty
Geographic distribution	Seasonally dry forests of the Piura Department, Peru, at elevations between 1000 and 1590 m	Tucumano-Boliviana Province, departments of Cochabamba, Chuquisaca and Santa Cruz (Bolivia), at elevations between 1450 and 2580 m