Tuesday, March 6, 2018

[Botany • 2018] Govenia polychroma • A New Species of Orchidaceae from Veracruz, Mexico


Govenia polychroma Salazar, Fernández-Díaz & Huerta-Alvízar

in Salazar, Fernández Díaz, Huerta-Alvizar, Jiménez-Machorro, Cabrera & Jimeno-Sevilla, 2018

Abstract

Govenia polychroma, a new orchid species from central Veracruz, Mexico is described and illustrated. It is similar to G. matudae, G. praecox and G. rubellilabia in the relatively small flowers, two leaves and globose corms, but differs from all previously described species in the purplish-magenta petals with yellow apices and the strongly conduplicate, narrowly channeled column foot. Due to its small geographical range (less than 1 sq.km.) and the small number of both populations (two) and individuals (14), the new species is considered as endangered.

Keywords: Cloud forest, extinction risk, taxonomy, Monocots


Figure 1. Govenia polychroma.
A
. Flowering plant in situ at Reserva del Bicentenario, Zongolica, Veracruz (Roldan-Hernández & JimenoSevilla 483). BH, various views of a cultivated plant from El Rincón de Axalpa, Naranjal, Veracruz (Fernández-Díaz & Huerta-Alvízar 37). B. Base of plant from side showing the corms from the previous (left) and current year’s growth (right). C. Leaf blades from above. D. Inflorescence. E. Flower from front. F. Flower from side. G. Column from side (left) and front (right). H. Dissection of a flower with a ruler in centimetres for scale.

Photographers: A = David Jimeno-Sevilla; B, C, F−H = Gerardo A. Salazar; D, E = Rolando Jiménez-Machorro.

Govenia polychroma Salazar, Fernández-Díaz & Huerta-Alvízar, sp. nov. 

 Type:—MEXICO. Veracruz: municipio Naranjal, El Rincón de Axalpa, cloud forest, 887 m elev., collected 30 August 2015, pressed in cultivation 5 October 2016, Fernández-Díaz & Huerta-Alvízar 37 (holotype: MEXU! isotypes: AMO! XAL!). 

Diagnosis: Differing from other species of Govenia in the purplish-magenta petals with yellow apices and strongly conduplicate column foot, such that the rounded, convex inner sides of the latter are in close proximity to each other instead of leaving a wide channel between them.

....

 Etymology:—From Greek polychromous, many-colored, in reference to the distinctive colour of the flowers in contrasting tones of yellow, magenta, purplish-magenta, white, and brown.


Gerardo A. Salazar, Adrián Fernández Díaz, Carlos René Huerta-Alvizar, Rolando Jiménez-Machorro, Lidia I. Cabrera and H. David Jimeno-Sevilla. 2018. Govenia polychroma, A New Species of Orchidaceae from Veracruz, Mexico. Phytotaxa. 343(1); 82–88.  DOI: 10.11646/phytotaxa.343.1.8

  

No comments:

Post a Comment