Rhynchosia Lour., Fl. Cochinch.
Creators: name: Bezerra, Luísa Maria De Paula Alves
name: Cândido, Elisa Silva
name: Vargas, Wanderleia De
name: Torke, Benjamin Marland
name: Lewis, Gwilym Peter
name: Perez, Ana Paula Fortuna
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Rhynchosia

description: Identification Key to the species of Rhynchosia that occur in South America
1. Leaves unifoliolate ................................................................................................................................................ 23. R. platyphylla
- Leaves trifoliolate ..............................................................................................................................................................................2
2. Inflorescence equalling or exceeding the length of the subtending leaf .......................................................................................... 3
- Inflorescence shorter than the length of the subtending leaf ...........................................................................................................21
3. Surface of leaflets bullate; inflorescence corymbiform ............................................................................................. 7. R. corylifolia
- Surface of leaflets not bullate; inflorescence racemose or paniculate .............................................................................................. 4
4. Plant covered with a cinereous indumentum; leaves sessile to subsessile ............................................................ 14. R. leucophylla
- Plant covered with a white or yellow indumentum; leaves petiolate ............................................................................................... 5
5. Calyx with at least one lobe equaling or exceeding the length of the corolla (sometimes slightly shorter on the same specimen in R. lateritia) ...................................................................................................................................................................................... 6
- No calyx lobes exceeding the length of the corolla (sometimes slightly longer on the same specimen in R. burkartii) ............... 11
6. Leaflets narrowly lanceolate to linear .......................................................................................................................... 16. R. lineata
- Leaflets narrowly elliptical to elliptical, oblong, ovate, deltoid to rhombic, obovate or rounded ................................................... 7
7. Inflorescence less than twice the length of the subtending leaf .................................................................................. 2. R. balansae
- Inflorescence often more than twice the length of the subtending leaf ............................................................................................ 8
8. Only the ventral lobe of the calyx exceeding the length of the corolla .............................................................. 26. R. schomburgkii
- All calyx lobes equaling or exceeding the length of the corolla ...................................................................................................... 9
9. Stems prostrate ........................................................................................................................................................... 13. R. lateritia
- Stems twining ................................................................................................................................................................................. 10
10. Stipules 3–10 mm long; leaflets pubescent or tomentose ........................................................................................ 24. R. reticulata
- Stipules 1–2.5 mm long; leaflets puberulous to pilose................................................................................................. 5. R. calycosa
11. Fruit slightly to strongly constricted between seeds; seeds bicolored ............................................................................................ 12
- Fruit without constrictions between seeds; seeds unicolored ......................................................................................................... 15
12. Fruit reddish-brown to black, glabrescent ...................................................................................................................................... 13
- Fruit greenish or brownish, pilose to pubescent ............................................................................................................................. 14
13. Vesicular glands on the abaxial leaflet surface only; stipels present; pedicel 2–4 mm long .............................. 18. R. melanocarpa
- Vesicular glands on both leaflet surfaces; stipels absent; pedicel 1–2 mm long ................................................ 10. R. erythrinoides
14. Fruits slightly constricted between seeds; seeds bicolored, yellow to orange and black .............................................. 15. R. lewisii
- Fruits strongly constricted between seeds; seeds bicolored black and red ......................................................... 22. R. phaseoloides
15. Flowers 35–39 mm long ....................................................................................................................................... 11. R. franciscana
- Flowers up to 18 mm long .............................................................................................................................................................. 16
16. Vesicular glands present on both leaflet surfaces ........................................................................................................................... 17
- Vesicular glands present only on the abaxial leaflet surface .......................................................................................................... 19
17. Fruit falcate .................................................................................................................................................................. 20. R. minima
- Fruit elliptic, oblong, or ovate ........................................................................................................................................................ 18
18. Fruit covered by pubescent to hirsute hairs and bulbous-based trichomes ............................................................... 12. R. hauthalii
- Fruit covered by pilose hairs, bulbous-based trichomes absent .................................................................................. 3. R. burkartii
19. Fruits narrowly obovate, lacking bulbous-based trichomes .......................................................................................... 25. R. rojasii
- Fruits oblong to slightly obovate, densely covered with bulbous-based trichomes........................................................................ 20
20. Vesicular glands on the abaxial leaflet surface brown to black; flowers 5–8 mm long ................................................... 9. R. edulis
- Vesicular glands on the abaxial leaflet surface yellow; flowers 9–13 mm long ................................................ 17. R. mantaroensis
21. Inflorescence racemose .................................................................................................................................................................. 22
- Inflorescence corymbiform or fasciculate ...................................................................................................................................... 23
22. Fruit reddish-brown to black, with constrictions between seeds ......................................................................... 21. R. naineckensis
- Fruit greenish to brownish, without constrictions between seeds ...................................................................... 4. R. caaguazuensis
23. Inflorescence fasciculate ................................................................................................................................................................ 24
- Inflorescence corymbiform ............................................................................................................................................................ 25
24. Fruit falcate ..................................................................................................................................................................... 27. R. senna
- Fruit oblong, obovate, or elliptic ............................................................................................................................. 8. R. diversifolia
25. Plant covered by hirsute hairs; calyx lobes elliptic or narrowly ovate ...................................................................... 6. R. claussenii
- Plant covered by pilose to pubescent hairs; calyx lobes linear or lanceolate ................................................................................. 26
26. Stems prostrate; stipules ovate, 5–10 mm long ........................................................................................................... 19. R. mineira
- Stems erect; stipules lanceolate to triangular, 2–5 mm long ...................................................................................... 1. R. arenicola
description: Published as part of Bezerra, Luísa Maria De Paula Alves, Cândido, Elisa Silva, Vargas, Wanderleia De, Torke, Benjamin Marland, Lewis, Gwilym Peter & Perez, Ana Paula Fortuna, 2024, Taxonomic revision of Rhynchosia Lour. (Leguminosae, Papilionoideae, Phaseoleae) in South America, pp. 1-67 in Phytotaxa 643 (1) on page 10, DOI: 10.11646/phytotaxa.643.1.1, http://zenodo.org/record/13214473