Friday, June 16, 2023

[Botany • 2022] Wurfbainia rubrofasciata (Zingiberaceae) • A New Species from Palawan, Philippines

Wurfbainia rubrofasciata Docot & Domingo, 

in Docot, Domingo, Moran, Camangeg & Poulsen, 2022.    

 A ginger species collected in Palawan, Philippines was initially thought to be Wurfbainia palawanensis but differs by the dark brown fertile bracts and red spinose fruits. This species is also morphologically similar to the continental Asian Wurfbainia microcarpa but can be distinguished from this by the entire ligule, petiolate lamina, congested rachis, and presence of red stripes at the base of the labellum. Therefore, we here describe Wurfbainia rubrofasciata providing colour plates, data on phenology, distribution, habitat, and a provisional conservation assessment. A key to five species of Wurfbainia in the Philippines is provided and we discuss the likely closest relatives of Wurfbainia palawanensis

Keywords: Amomum s.l., endemic, endangered, taxonomy, Wurfbainia.

Wurfbainia rubrofasciata Docot & Domingo
 (A) Habit. (B) Ligule. (C) Inflorescence and infructescence. (D) Inflorescence showing different angle of the flowers. (E) Infructescence. (F) Floral dissection. (G) Stamen at different views. (notice the white arrow pointing a lateral staminode).
Based from C.B.M. Domingo & R.V.A. Docot PL18-006 (type). 
Abbreviations: br: bracteole; ca: calyx tube; dc: dorsal corolla lobe; fb: fertile bract; fl: flower; inf: inflorescence; la: labellum; lc: lateral corolla lobes; ov: ovary with epigynous glands on the top.
 Scale bars = 1 cm. (Photographs by R.V.A. Docot).

Wurfbainia rubrofasciata Docot & Domingo, sp. nov.

Diagnosis: Wurfbainia rubrofasciata is morphologically similar to W. microcarpa (C.F.Liang & D.Fang) Skornick. & A.D.Poulsen in having white flowers with a clawed and saccate labellum but differs in the entire ligule (vs emarginate to bilobed), 7−11 mm long petiole (vs < 2 mm); 2−4 flowers open at a time (vs 1−2); congested rachis (vs elongated); white calyx tube and corolla lobes (vs white to red), presence of 10−12 red stripes at the base of the labellum (vs minute red dots) and ovate and petaloid lateral lobes of the anther crest (vs oblong and fleshy).

Etymology: The specific epithet refers to the red stripes at the base of the labellum.

Rudolph Valentino A. Docot, Carl Bryan M. Domingo, Cecilia B. Moran, Lea M. Camangeg and Axel Dalberg Poulsen. 2022. Wurfbainia rubrofasciata (Zingiberaceae), A New Species from Palawan, Philippines. Webbia. Journal of Plant Taxonomy and Geography 77(2); 277-283. DOI: 10.36253/jopt-13461