Millettia sensu Dunn 1912
Creators: name: Song, Zhu-Qiu
name: Li, Shi-Jin
name: Vu, Quang Nam
name: Khang, Nguyen Sinh
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Millettia

description: Key to species of Millettia from Vietnam
1. Woody climber (sometimes as tree with straggling branches in Millettia extensa); brachyblasts distinct ........................................2
- Shrub or tree; brachyblasts distinct or indistinct ................................................................................................................................6
2. Stipels present.....................................................................................................................................................................................3
- Stipels absent ......................................................................................................................................................................................5
3. Stamens monadelphous; pods compressed...................................................................................... Millettia extensa (Benth.) Baker
- Stamens diadelphous; pods inflated ...................................................................................................................................................4
4. Flowers 14–17 mm long............................................................................................................................ Millettia pachyloba Drake
- Flowers 7–10 mm long.................................................................................................................... Millettia penduliformis Gagnep.
5. Leaflets densely sericeous below; pods inflated ............................................................................... Millettia sericea (Vent.) Hassk.
- Leaflets sparsely pubescent below; pods compressed.......................................... Millettia densiflora Mattapha, Lanors. & Lamxay
6. Stipels present............................................................................................................................................. Millettia kangensis Craib
- Stipels absent ......................................................................................................................................................................................7
7. Brachyblasts indistinct, bearing only 2 flowers at each node ............................................................................................................8
- Brachyblasts distinct, bearing 3 or more flowers at each node ........................................................................................................11
8. Ovules 2 (rarely 1 or 3); pods rather thick; seeds usually 1 .............................................................. Millettia pinnata (L.) Panigrahi
- Ovules 3–10 (rarely 2); pods compressed; seeds usually 3 or more ..................................................................................................9
9. Pod with two wings ..................................................................................................................................... Millettia diptera Gagnep.
- Pod with no wings ............................................................................................................................................................................10
10. Flowers 10–14 mm long, white to pale green; bracts 2–6 mm long; pods 1.5–3 cm wide.......................... Millettia xylocarpa Miq.
- Flowers 8–10 mm long, purple; bracts 1–1.5 mm long; pods 1.3–2 cm wide ................................... Millettia erythrocalyx Gagnep.
11. Stipules persistent, forming a brush at the top of the branches; standard with basal callosities ......................................................12
- Stipules caducous, not forming a brush at the top of the branches; standard without basal callosities ...........................................13
12. Shrub; flowers ca 1 cm long; pods glabrescent ..................................................................................... Millettia penicillata Gagnep.
- Tree; flowers 2–2.5 cm long; pods tomentose................................................................................................. Millettia cubittii Dunn
13. Bracteoles inserted at middle or upper part of pedicel ............................................................................. Millettia principis Gagnep.
- Bracteoles inserted at apex of pedicel ..............................................................................................................................................14
14. Leaflet blades abaxially appressed pilose..................................................................... Millettia pulchra (Benth.) Kurz var. pulchra
- Leaflet blades abaxially gray tomentose ........................................................ Millettia pulchra (Benth.) Kurz var. tomentosa Prain
description: Published as part of Song, Zhu-Qiu, Li, Shi-Jin, Vu, Quang Nam & Khang, Nguyen Sinh, 2022, Taxonomic notes on the genus Millettia (Fabaceae: Millettieae) in Vietnam, pp. 169-185 in Phytotaxa 571 (2) on page 170, DOI: 10.11646/phytotaxa.571.2.4, http://zenodo.org/record/7284336