Gymnosiphon mayottensis Cheek, sp. nov. (Burmanniaceae) a new species from Mayotte, Comoro Islands Author Cheek, Martin Author Traclet, Sébastien text Adansonia 2020 2020-05-25 42 8 179 188 journal article 21752 10.5252/adansonia2020v42a8 c972bdea-ffd6-46e9-9d7e-2543609076fd 1639-4798 3877454 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 mm long ................................................................................. 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 , sp. nov. — Inflorescence bracts <1/4 as long as rhachis internodes, inner tepals present; stigmas pendulous; tepals white at anthesis ............................................................................................................ 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 long ................................................................... G. bekensis Letouzey — Flowers yellow or white, perianth tube < 5 mm long .............................................. 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