- Scientific Name: Paeonia delavayi Franch.
- Ref: Bull. Soc. Bot. France 33:382. 1886
- Synonyms:
- Paeonia delavayi f. alba (Bean) S.G.Haw
- P. delavayi subsp. angustiloba (Rehder & E.H.Wilson) B.A.Shen
- P. delavayi var. angustiloba Rehder & E.H.Wilson
- P. delavayi subsp. lutea (Delavay ex Franch.) B.A.Shen
- P. delavayi f. lutea (Delavay ex Franch.) S.G.Haw
- P. delavayi f. trollioides (Stapf ex Stern) S.G.Haw
- P. franchetii Halda
- P. handel-mazzettii Halda
- P. lutea Delavay ex Franch.
- P. potaninii Kom.
- P. trollioides Stapf ex Stern
- English Common Name: Delavay’s tree peony, Yunnan peony
- Chinese Common Name: 紫牡丹 zǐ∙mǔdān, 滇牡丹 Diān mǔdān
- Japanese Common Name: ムラサキボタン [紫牡丹] murasakibotan
- Family: Paeoniaceae
- Genus: Paeonia
- Distribution: Dry Pinus or Quercus woods, thickets, rarely grassy slopes or glades in virgin Picea forests; 2000–3600 m; W Sichuan, SE Xizang, C and N Yunnan.
- Photo: Baima Snow Mt., Yunnan
Shrubs 0.2--1.8 m tall, glabrous throughout. Roots tuberous. Turions present. Stems brown-gray. Proximal leaves 2-ternate; leaflets always segmented, base usually decurrent; segments again segmented or lobed; ultimate segments and lobes (17--)25--100(--300), linear or linear-lanceolate, 0.5--10 × 0.2--2.7 cm, margin entire or occasionally dentate. Flowers 1--3 per shoot, both terminal and axillary, basipetal, ± pendulous, single, 6--10 cm wide. Bracts 1--5, varying in shape and size. Sepals 2--9, green abaxially, green with a pink base adaxially, or wholly purple or purple-red, triangular-orbicular or orbicular, 1.3--3.7 × 0.6--2.3 cm, apex rounded to mucronate or acuminate. Petals (4--)7--11(--13), yellow, yellow with a red or purple-red spot at base, red, dark red, or dark purple-red, sometimes white, green-yellow, yellow with a red margin, or orange. Filaments yellow, pink-red, or dark purple-red; anthers yellow, pink, red, or dark purple-red. Disc yellow, red, or dark red, annular or shortly cylindric. Carpels 2--5(or 6--8); ovary usually green, sometimes purple. Stigmas green-yellow, yellow, red, or purple-red. Follicles brown at maturity, oblong-ovoid, 2--3.5 × 1--1.5 cm. Seeds brown-black. Fl. May--Jun, fr. Aug--Sep. 2n = 10*. (Flora of China)
