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| Hornstedtia olivacea Docot & Pranada, in Docot, Pranada & Mendez, 2021. Gardens’ Bulletin Singapore. 73(2) |
ABSTRACT
A new species, Hornstedtia olivacea Docot & Pranada, from the province of Quezon, Philippines is described here with information on its distribution, habitat and phenology, along with a provisional IUCN conservation assessment. A second-step lectotypification of Hornstedtia conoidea Ridl. is proposed and a previous lectotypification of Hornstedtia microcheila Ridl. is clarified. Examination of the collection Ramos & Edaño 44454 supports the occurrence of Hornstedtia havilandii (K.Schum.) K.Schum. in the Philippines but new material is needed to check if the populations in the province of Sulu are distinct enough from the populations in Borneo to be recognised as a distinct taxon. An updated key to the Hornstedtia species of the Philippines is also provided.
Keywords. Critically endangered, endemic, Hornstedtia conoidea, Hornstedtia havilandii, Hornstedtia microcheila, lectotypification
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| Hornstedtia olivacea Docot & Pranada. A. Habit. B. Ligule. Insets: base of the lamina (front and back view). C. Inflorescence. D. Fruit from spirit material. E. Floral parts. Abbreviations: br, bracteoles; ca, calyx tube; dc, dorsal corolla lobe; eg, epigynous glands; fb, fertile bract; inf, inflorescence; la, labellum; lc, lateral corolla lobes; ls, lateral staminodes; ov, ovary; sb, sterile bract; st, stamen. All from the type M.A.K. Pranada 2. (Photos: M.A.K. Pranada) |
Hornstedtia olivacea Docot & Pranada, sp. nov.
Similar to Hornstedtia microcheila Ridl. but differs in the generally longer petiole
(1.5−3 cm vs 1−2 cm long in H. microcheila), shape and margin of the lamina (linear
and undulate vs narrowly elliptic and plane), colour and apex of the sterile bract (olive green and mucronate vs red and acute), number of flowers open at anthesis (1 only vs 1
or 2), colour of the corolla lobes (red vs white), colour of the base of the labellum (red
vs yellow), and presence of petaloid lateral staminodes.
Etymology. The specific epithet refers to the olive-green sterile bracts.
Taxonomic notes on Philippine Hornstedtia
- Hornstedtia conoidea Ridl., Leafl. Philipp. Bot. 2: 605 (1909).
- Hornstedtia havilandii (K.Schum.) K.Schum., Pflanzenr. IV, 46 (Heft 20): 193 (1904).
- Hornstedtia microcheila Ridl., Leafl. Philipp. Bot. 2: 606 (1909).
- H. crispata
- H. garbosa
- H. lophophora
- H. annadeguzmaniae
Rudolph Valentino Abrenica Docot, Mc Andrew Pranada and Noe Mendez. 2021. Taxonomic Notes on Philippine Hornstedtia (Zingiberaceae) including A Description of A New Species. Gardens’ Bulletin Singapore. 73(2); 413 - 423. DOI: 10.26492/gbs73(2).2021-11
