Table 2.

Morphological and ecological features comparison between P.xinningensis sp. nov. and its related species.

Features	P.xinningensis	P.hubeiensis	P.cicutariifolia	P.merrilliana complex
Floral morph	Homostylous	Distylous	Homostylous	Distylous or homostylous
Umbel layers	1	1–2	1	1–3
Corolla diameter	8–12 mm	13–18 mm	6–10 mm	9–19 mm
Corolla lobes	Apex conspicuously emarginate	Apex conspicuously emarginate	Apex conspicuously emarginate	Apex rounded
Scape length	0.8–2 cm	3.5–9.6 cm	1–3 cm	1.3–9 cm
Pollens	Pantoporate	Pantoporate	Pantoporate	Pantoporate or stephanocolpate
Pollen sac	Black	Yellow	Yellow	Yellow
Cotyledon	Triangular obovate	Ovate	Ovate	Ovate
Older Leaves	Pinnatisect, with 11–19 pinnae, the terminal pinna similar to others, 3-lobed or parted	Pinnatisect, with 13–19 pinnae, the terminal pinna similar to others, 3-lobed or parted, margin coarsely dentate	Pinnatisect, with 7–17 pinnae, the terminal pinna similar to others, 3-lobed	Pinnatisect, with 11–21 pinnae, the terminal pinna similar to others, 3-lobed or parted
Glandular hairs	Leaves and scape densely covered with glandular hairs (0.07–0.42 mm)	Leaves and scape densely covered with glandular hairs (0.76–0.88 mm)	without	without
Distribution	Hunan	Hubei	Anhui, Zhejiang	Anhui, Zhejiang
Habitat	Karst caves	Shady damp rock crevices	Stream sides or under broadleaf deciduous forests of northern slopes	Stream sides or under broadleaf deciduous forests of northern slopes