Gymnosiphon
Creators: name: Cheek, Martin
name: Xander M. Van Der Burgt
name: Tchiengué, Barthélemy
name: Thiam, Aminata
name: Molmou, Denise
name: Doré, Tokpa Seny
name: Magassouba, Sékou
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Dioscoreales
Burmanniaceae
Gymnosiphon

description: KEY TO THE SPECIES OF GYMNOSIPHON IN AFRICA, COMORO ISLANDS AND MADAGASCAR.
1. Stigmas with filiform extensions exserted from flower at anthesis ................................................................ 2
— Stigmas lacking filiform extensions .............................................................................................................. 5
2. Flowers zygomorphic, inflorescence capitate, Madagascar ................................................... G. marieae Cheek
— Flowers actinomorphic, inflorescences cymose. Africa and Comoro Islands ................................................. 3
3. Perianth tube 2-5 mm long ......................................................................................................................... 4
— Perianth tube 1-2 mm long. Gabon ................................................................ G. constrictus Maas & H. Maas
4. Inflorescence bracts about as long as rhachis internodes, inner tepals absent; stigmas horizontal; tepals changing from white to translucent at anthesis ............................................................................. G. mayottensis Cheek
— Inflorescence bracts <1/4 as long as rhachis internodes, inner tepals present; stigmas pendulous; tepals white at anthesis. R. of Guinea to DRC ......................................................................... G. longistylus (Benth.) Hutch.
5. Rootstock with numerous bulbils, ovary ribbed, inner tepals absent. Malawi, NE Zambia, S. Tanzania .......... .................................................................................................................................. G. afro-orientalis Cheek
— Rootstocks lacking bulbils, ovary smooth, inner tepals present. Guineo-Congolian Africa or Madagascar ......... 6
6. Flowers sessile or subsessile, pedicel if present to 0.5 mm long .................................................................... 7
— Flowers with a distinct pedicel 1 mm long or more ..................................................................................... 8
7. Flowers white, perianth tube 10 mm or more long ...................................................................................... 9
— Flowers yellow or white, perianth tube <5 mm long. R. of Guinea & Liberia ......... G. samoritoureanus Cheek
8. Plants commonly 15-35 cm tall; base of stem completely covered in many tens of brown leaf-scales. E. Africa ...................................................................................................................................... G. usambaricus Engl.
— Plants always <15 cm tall; base of stem sparsely covered, with only 3-4 leaf scales. Madagascar ...................... .................................................................................................................................. G. danguyanus H.Perrier
9. Corolla diam. 12-15 mm, ≥ corolla tube length 12 mm. E. Cameroon to R. of Congo ....... G. bekensis Letouzey
— Corolla diam. 10-11 mm, <corolla tube length (13-) 14-18 mm. R. of Guinea ............ G. fonensis Cheek, sp. nov.
description: Published as part of Cheek, Martin, Xander M. Van Der Burgt, Tchiengué, Barthélemy, Thiam, Aminata, Molmou, Denise, Doré, Tokpa Seny & Magassouba, Sékou, 2024, New discoveries of plants from Republic of Guinea, W. Africa, including Gymnosiphon fonensis Cheek, sp. nov. (Burmanniaceae), a new Critically Endangered species from Simandou, pp. 89-101 in Adansonia (3) (3) 46 (10) on page 92, DOI: 10.5252/adansonia2024v46a10, http://zenodo.org/record/12605690