Humboldtia Vahl, 1794

Kumar, Ettickal Sukumaran Santhosh, Shareef, Sainudeen Muhammed & Vikraman, Ramachandrakurup Raj, 2022, Humboldtia ponmudiana (Fabaceae-Detarioideae), a new species from Kerala, India, Phytotaxa 552 (1), pp. 115-121 : 120

Key to the species of Humboldtia Vahl

1. Stipules appendiculate at base............................................................................................................................................................2

- Stipules not appendiculate at base......................................................................................................................................................7

2. Leaflets 4 ...........................................................................................................................................................................................3

- Leaflets 6–12 ......................................................................................................................................................................................4

3. Flowers crimson-red; petals up to 8 mm long; pods 1–2 seeded ......................................................... H.brunonis var. raktapushapa

- Flowers white suffused with pink; petals 1.2–1.5 cm long; Pods 3–4 seeded ............................................ H.brunonis var. brunonis

4. Stipules 5–8 cm long ..........................................................................................................................................................................5

- Stipules 2–3 cm long ..........................................................................................................................................................................6

5. Flowers with 1–1.2 cm long pedicels............................................................................................................................. H.decurrense

- Flowers sessile or rarely up to 0.2 cm long pedicels.................................................................................................... H.ponmudiana

6. Inflorescence racemose, pods straight, tomentose ............................................................................................................. H.vahliana

- Inflorescence corymbose, pods falcate, velvety .......................................................................................................... H. bourdillonii

7. Flowers crimson, staminal filaments glabrous ...................................................................................................................................8

- Flowers white, staminal filaments pilose at base ............................................................................................................ H.sanjappae

8. Leaflets 2 ......................................................................................................................................................... H.unijuga var. unijuga

- Leaflets (4–) 6 (–8)............................................................................................................................................ H.unijuga var. trijuga