Codonopsis atriplicifolia, Y. YU & Q. Wang, MW, 2021

Zhou, Yu-Yang, Si, Yun-Hao, Zhang, Zhen, Wang, Qiang & Yu, Yan, 2021, Codonopsis atriplicifolia (Campanulaceae), a new species from western Sichuan, China, Phytotaxa 512 (3), pp. 197-204 : 201-202

Key to Codonopsis atriplicifolia and its allies

1. Corolla campanulate, 1.7–5.5 cm long; reticulate veins present on corolla surfaces........................................................................2.

- Corolla tubular, 0.9–2 cm long; veins absent on corolla surfaces.....................................................................................................7.

2. Vines; corolla campanulate, 3.3–5.5 cm long, ca. 3 cm wide; calyx lobe linear-lanceolate ................................. Codonopsis farreri

- Herbs erect or scandent; corolla broadly campanulate, 1.7–4 cm long, 1–4 cm wide; calyx lobes ovate to narrowly deltoid.........3.

3. Leaf blade deltoid-ovate or broadly ovate......................................................................................................... Codonopsis deltoidea

- Leaf blade non-deltoid.......................................................................................................................................................................4.

4. Stem branched; leaves non-rosulate, 1.5–3.5(–5) cm long, 1.3–3 cm wide, base slightly cordate or rounded ................................... ......................................................................................................................................................................... Codonopsis viridiflora

- Stem simple; leaves subrosulate, 3–15 cm long, 0.5–3.8 cm wide, base cuneate.............................................................................5.

5. Stems more or less branched at lower and middle parts; petiole 0.5–10 cm long; calyx lobes 4–8 mm long, 2–3 mm wide, with sinus between lobes truncate .............................................................................................................................................................6.

- Stems usually without branches at lower and middle parts; petiole less than 1 cm long; calyx lobes 8–12 mm long, 4–6 mm wide, with sinus between lobes narrow and pointed.................................................................................................. Codonopsis meleagris

6. Root 0.5–1.5 cm in diameter; leaf blade ovate, oblong, elliptic or lanceolate, 2–13 cm long, 1.5–7.5 cm broad, margin sparsely dentate or crenate, or nearly entire; corolla lobed to near middle................................................................. Codonopsis subscaposa

- Root less than 0.5 cm in diameter; leaf blade linear-lanceolate, 3–15 cm long, 0.5–1.5 cm broad, margin subentire to pinnatipartite; corolla lobed to near one-third ..................................................................................................................... Codonopsis atriplicifolia

7. Stems erect, mostly simple; leaves subrosulate, base cuneate, margins entire to slightly sinuate; corolla grey or slightly pale purple, lobed to ca. 1/6, with a pale amaranthine ring below throat........................................................................ Codonopsis gongshanica

- Stems procumbent, ascending or trailing, always branched at lower and middle parts; leaves non-rosulate, base cordate or rounded, margins crenate, dentate or recurved; corolla pale yellow, yellow-green or pale blue, lobed to 1/4 or 1/3, without rings...............8.

8. Leaf base cordate, margins recurved; corolla lobed to ca. 1/3 ......................................................................... Codonopsis bhutanica

- Leaf base rounded or cuneate, margins crenate or dentate; corolla lobed to ca. 1/4...................................... Codonopsis subsimplex