Jatropha chazaroi within the subsection Multifidae, 1753

Sánchez-Sánchez, Odilón, Jiménez-Ramírez, Jaime, Arzaba-Villalva, Carlos, Francisco-Gutiérrez, Antonio & Rosales-Lara, Luis Ángel, 2023, Jatropha chazaroi (Euphorbiaceae), an endangered new species from Apazapan, Veracruz, Mexico, Phytotaxa 594 (2), pp. 130-136 : 134

Key to distinguish Jatropha chazaroi within the subsection Multifidae , modified from Dehgan (2012)

1. Plants herbaceous; caudex subterranean ................................................................... J. cathartica Terán & Berlandier (1832: 9–11) .

- Plants woody; caudex absent or aerial................................................................................................................................................2

2. Leaves with 9–11 lobes, margin incised; stipules 6–15(–25) mm long; capsules 3–5 cm in diameter; seeds without caruncle ......... ...................................................................................................................................................... J. multifida Linnaeus (1753: 1006)

- Leaves with 3–5(–7) lobes, margin entire; stipules 4 mm long or less; capsules 2.55 cm in diameter or less; seeds with caruncle.

3. Trees or shrubs up to 5 m tall, without a caudex; stipules deciduous, non-spinescent; leaf blade 25–36 × 30–35 cm; petiole 25–39 cm long; inflorescence 4–14.4 cm long; calyx and corolla connate; capsule spherical, conspicuously trilobed; seeds oblong-elliptic, 1–1.3 cm long ..................................................................................................................................................................... J. chazaroi

- Shrubs 1–2 m tall, with a conspicuous aerial caudex; stipules persistent, spinescent; leaf blade 14–22.5(–32) × 8.5–19(–23.5) cm; petiole 16–28 cm long; peduncle (6–) 12.5–36 cm long; calyx and corolla not connate; capsule cylindrical, slightly trilobed at maturity; seeds ovoid, 0.55–0.6 cm long......................................................................................................................... J. podagrica