Chionanthus Linnaeus 1753
Creators: name: Quang, Bui Hong
name: Nuraliev, Maxim S.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Lamiales
Oleaceae
Chionanthus

description: Key to the species of Chionanthus in Cambodia, Laos and Vietnam
1. Leaves apparently verticillate (some nodes closely spaced) ........................................................................................... C. robinsonii
- Leaves distant .....................................................................................................................................................................................2
2. Leaf blade linear............................................................................................................................................................. C. harmandii
- Leaf blade elliptic, oblong-elliptic, ovate-elliptic, lanceolate or oblanceolate...................................................................................3
3. Inflorescence subcapitate or capitate, flowers subsessile or sessile............................................................................ C. subcapitatus
- Inflorescence paniculate, flowers sessile to distinctly pedicellate .....................................................................................................4
4. Leaf blade 16–33(40) cm long; fruit 5–10 cm long, 2.5–5 cm wide.............................................................................. C. henryanus
- Leaf blade 5–30 cm long; fruit 1–3.5 cm long, 0.5–3 cm wide (unknown in C. macrothyrsus and C. maxwellii) ...........................5
5. Corolla lobes (6)7–9(10) mm long; leaf blade with 9–11 pairs of secondary veins; inflorescence many-flowered............................ ......................................................................................................................................................... C. mala-elengi subsp. terniflorus
- Corolla lobes 1.5–9 mm long; if lobes longer than 7 mm (C. maxwellii and rarely C. microstigma), then either leaf blade with 5–10 pairs of secondary veins, or inflorescence ca. 7-flowered..................................................................................................................6
6. Inflorescence 2.5–20(25) cm long, most often more than 50-flowered; corolla lobes 2–4(5.5) mm long.........................................7
- Inflorescence usually 1–5 cm long (but to 8 cm long in C. hainanensis), few- to many-flowered; corolla lobes 1.5–9 mm long ..... ............................................................................................................................................................................................................9
7. Leaf blade usually oblanceolate (to oblong-elliptic or elliptic); inflorescence usually 4–10 cm long................................ C. thorelii
- Leaf blade usually oblong-elliptic to ovate-elliptic (rarely lanceolate or oblanceolate); inflorescence usually 2.5–20(25) cm long. ............................................................................................................................................................................................................8
8. Peduncle 1.5–3.3 cm long .............................................................................................................................................. C. ramiflorus
- Peduncle 3.5–6 cm long ............................................................................................................................................ C. macrothyrsus
9(6). Corolla lobes 1.5–3 mm long ...........................................................................................................................................................10
- Corolla lobes 4–9 mm long ..............................................................................................................................................................11
10. Leaf blade with 12–20 pairs of secondary veins; inflorescence densely paniculate, 1–4 cm long; corolla lobes 1.5–2 mm long ...... ...................................................................................................................................................................................... C. microbotrys
- Leaf blade with 7–8 pairs of secondary veins; inflorescence laxly paniculate, 2–8 cm long; corolla lobes ca. 3 mm long................ ...................................................................................................................................................................................... C. hainanensis
11(9). Petiole 1–5 mm long; inflorescence 1–2 cm long; corolla lobes 4–7 mm long ............................................................ C. parkinsonii
- Petiole 5–40 mm long; inflorescence 2–5 cm long; corolla lobes 4–9 mm long .............................................................................12
12. Petiole 5–12 mm long; leaf blade (5) 6–11 cm long; corolla lobes 4–9 mm long ....................................................... C. microstigma
- Petiole 20–40 mm long; leaf blade 11–18 cm long; corolla lobes 7–8.5 mm long ......................................................... C. maxwellii
description: Published as part of Quang, Bui Hong & Nuraliev, Maxim S., 2021, The genus Chionanthus (Oleaceae) in Cambodia, Laos and Vietnam, pp. 167-195 in Phytotaxa 525 (3) on page 169, DOI: 10.11646/phytotaxa.525.3.1, http://zenodo.org/record/5712386