Cyrtorchis henriquesiana (Ridl.) Schlechter (1918: 131)

Azandi, Laura, Stevart, Tariq, Sonké, Bonaventure, Simo-Droissart, Murielle, Avana, Marie-Louise & Droissart, Vincent, 2016, Synoptic revision of the genus Cyrtorchis Schltr. (Angraecinae, Orchidaceae) in Central Africa, with the description of a new species restricted to submontane vegetation, Phytotaxa 267 (3), pp. 165-186 : 178

8. Cyrtorchis henriquesiana (Ridl.) Schlechter (1918: 131) . ( Fig. 3G ) Basionym: Angraecum henriquesianum Ridley (1887: 231) . Listrostachys henriquesiana (Ridl.) Rolfe (1897: 157) . Aerangis henriquesiana (Ridl.) Schlechter (1918: 117) . Homocolleticon henriquesiana (Ridl.) Szlachetko & Olszewski (2001: 727) . Type:— PRINCIPE. Princes islands, Sundi, 107 m, F.Newtown 15 (holotype BM!)

Heterotypic synonyms: Angraecum subcylindrifolium De Wildeman (1916: 192) . Cyrtorchis subcylindrifolia (De Wild.) Schlechter (1918: 132) . Lectotype:— DEMOCRATIC REPUBLIC OF THE CONGO. Nala, territoire Paulis, 1 July 1911, A.Boone 113 (lectotype BR!, designated here). Paralectotype:— DEMOCRATIC REPUBLIC OF THE CONGO. Nala, territoire Paulis, 1 July 1911, A.Boone 115 (paralectotype BR). syn. nov.

Additional specimens examined:— GHANA. Nkawkaw , 152 m, 30 March 1967, Bowling 36564 (K) ; Ashanti, Goaso , February 1954, Westwood 119 (K) . CAMEROON. Village de Ma’an, UFA 09-022 (Wijma), 557 m, 17 September 2013, Droissart et al. ( Ombrière de Yaoundé ) 4597 ( BRLU, YA) . EQUATORIAL GUINEA. Akoak Benguan (inselberg) à 5 km au sud d’Akuom , 580 m, 23 August 2002, Deman et al. 9 ( BRLU) ; ibid., 500 m, 24 August 2002, Deman et al. 17 ( BRLU) ; ibid., 28 August 2002, Deman et al. 34 ( BRLU) ; Bikaba, route de Monte Alén à Niefang , 28 August 1999, Ndong Bokung & Stévart 33 ( BRLU) ; Mongola , près de Anisok, 550 m, 31 August 1999, Ndong Bokung & Stévart 39 ( BRLU) ; Inselberg Akuom, 6 km à l’Est de Nsuameyong , 31 August 2000, Ndong Bokung & Stévart 225 ( BRLU) . SÃO TOME AND PRINCIPE. Porto Real, 1956, Rose 145 ( P) ; ibid., 67 m, 1956, Rose 51012 (K) ; Principe, entre Focinho de Cao et Cisco Mantero , 70 m, 1 November 1998, Stévart 477 ( BRLU, K) ; Oque Pipi , 300 m, 26 August 2002, Primo & Stévart 81 ( BRLU) ; Principe Morro Fundao , 370 m, 18 September 2002, Primo & Stévart 86 ( BRLU) ; ibid., 260 m, 1 September 1999, Stévart 664 ( BRLU) . GABON. Mbé Akélayong , 570 m, 22 August 2001, Ngok Banak 148 ( BRLU) ; Tchimbélé , près du bras mort du lac, 570 m, 15 August 2002, Stévart 1809 ( BRLU) . DEMOCRATIC REPUBLIC OF THE CONGO. Eala, Coquilhatville , 2 September 1907, Seret 1001 ( BR) .

Distribution:— According to Govaerts et al. (2016), Cyrtorchis henriquesiana occurs in three countries ( São Tomé and Príncipe, Equatorial Guinea ( Rio Muni) and Gabon). We have, however, seen specimens clearly assignable to this species from three other countries: Ghana, Cameroon and Democratic Republic of the Congo. Cyrtorchis henriquesiana is thus distributed in Upper Guinea, Lower Guinea and Congolian Domains.

Habitat and ecology:— Epiphyte or lithophyte found in rainforest, secondary forest and in plantations between 67 and 590 m elevation. Flowering peak in August.

Notes:— Cyrtorchis subcylindrifolia , which was formally synonymized with C. aschersonii by Summerhayes (1960), is considered here as a synonym of C. henriquesiana . The linear and acicular leaves are more related to C. henriquesiana rather than to C. aschersonii which has larger (7.5–17 mm large) and V-shaped leaves. Another discriminant feature is the length of the inflorescence which is shorter in C. subcylindrifolia and in C. henriquesiana (up to 2.3 cm) compared to C. aschersonii (more than 12.5 cm).

In the protologue of Angraecum subcylindrifolium , two syntypes were cited by De Wildeman (1918), Boone 113 and Boone 115 both from Nala, territoire Paulis, Democratic Republic of the Congo. We designated Boone 113 as the lectotype since the specimen is more complete and representative of the protologue.

Figures

FIGURE 3. Illustrative pictures of some central African taxa of the genus Cyrtorchis. A. C. arcuata. B. C. arcuata subsp. whytei. C. C. aschersonii. D. C. brownii. E. C. chailluana. F. C. hamata. G. C. henriquesiana. H. C. injoloensis. I. C. letouzeyi. J. C. monteiroae. K. C. ringens. L. C. submontana. Photographs ‘A–G’ & ‘I–L’ by Droissart Vincent and ‘H’ by Lourens Grobler.