A new species of Polystemma (Apocynaceae, Asclepiadoideae, Asclepiadeae, Gonolobineae) from the state of Oaxaca, Mexico Author Alvarado-Cárdenas, Leonardo O. 0000-0002-4938-8339 leonardoac@ciencias.unam.mx Author García-Mendoza, Abisaí Josué 0000-0002-0284-5117 Universidad Nacional Autónoma de México, Instituto de Biología, Jardín Botánico. Tercer circuito exterior de Ciudad Universitaria, Coyoacán, 04510 Ciudad de México, México abisai@ib.unam.mx Author Sandoval-Gutiérrez, Daniel 0000-0002-5141-5906 Universidad Nacional Autónoma de México, Instituto de Biología, Jardín Botánico. Tercer circuito exterior de Ciudad Universitaria, Coyoacán, 04510 Ciudad de México, México sagudan2@hotmail.com Author Lozada-Pérez, Lucio 0000-0003-1093-5830 lope@ciencias.unam.mx text Phytotaxa 2024 2024-05-16 649 1 111 120 http://dx.doi.org/10.11646/phytotaxa.649.1.7 journal article 10.11646/phytotaxa.649.1.7 f72642f5-9f22-48df-836a-35cc1cd22f5d 1179-3163 13215928
TABLE 2. Morphological attributes present in the compared Polystemma species.
Polystemma cordatumPolystemma leopardum
Bracts2–3 mm long4–6.6 mm long
Flower diameter2–2.5 cm2–2.5 cm
Tube4.5 mm long, dark red4.9–6 mm long, black or dark purple
Lobes6–7 × 5–5.5 mm, ovate, dark red5–8.2 × 5–6.8 mm, ovate-lanceolate, yellowish with black or dark purple reticulated pattern
External coronabilobed, 1.5 mm long, without small teeth between thembilobed, 2.0–2.6 mm long, with small teeth between them and sometimes below them
Internal coronabilobed with 0–2 small teeth between thembilobed with (2) 4 small teeth between them
Style apexflatconvex, obtuse