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| Hedyotis hamiguitanensis Santor, Santiago & Alejandro, in Santor, Santiago, ... et Alejandro, 2021. DOI: 10.36253/jopt-10651 |
Abstract
Hedyotis hamiguitanensis, from Mt. Hamiguitan, Davao Oriental, Philippines, is described, illustrated, and compared with two similar species, H. whiteheadii and H. schlechteri. This species is distinguished from congeneric Philippine species by its 5–12 cm long, compound, umbellate inflorescences, pendulous flowers, lanceolate to oblanceolate, thick, scabrid leaf blades with revolute margins. Its phylogenetic systematic position within the tribe Spermococeae is determined with a phylogenetic analysis using chloroplast (rps16, petD) and nuclear ribosomal (ITS, ETS) nucleotide sequence data.
Keywords: Hedyotis, Rubiaceae, Philippines, taxonomy
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| Hedyotis hamiguitanensis Santor, Santiago & Alejandro. A. Flowering and fruiting branch. B. Stipules. C. Inflorescence. D. Flower, lateral view. E. Flower, top view. F. Calyx and style. G. Opened Corolla showing stamens. H. Capsule. I. Dissected capsule showing the 2 locules. J. Seed. Illustrated by P.J.R. Santor. |
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| Hedyotis hamiguitanensis Santor, Santiago & Alejandro. A. Habit of CB17051 found in mossy forest at 1000 m elevation. B. Habit of CB17036 found in thepygmy forest of Mt. Hamiguitan at 1600 m elevation. C. Leaf adaxial surface. D. Leaf abaxial surface. E. Node, showing intrapetiolar stipule with laciniate teeth; stems, stipules and petioles are hirsute. G. Flower. H. Infructescence. I. Fruit with 2 colleters at each calyx lobe sinus. Photos by N.K. Alfeche. |
Hedyotis hamiguitanensis Santor, Santiago & Alejandro, sp. nov.
Diagnosis: Hedyotis hamiguitanensis is similar to H. whiteheadii and H. schlechteri because of general leaf size ranging from 1.5-4 cm with 3—4 lateral nerves, densely hirsute petioles, and compound peduncled inflorescence, from which it can be distinguished by its lanceolate to oblanceolate, relatively thick leaves, scabrid surface, margins that are entire and revolute, stems, stipules, peduncle, pedicels with hirsute indumentum, inflorescence a com-pound, 5–12 cm long, umbel, and by the pendulous, 8–11 mm long flowers.
Etymology: The specific epithet is based on the type locality, Mt. Hamiguitan, Davao Oriental, Philippines.
Propa Joy R. Santor, Duane Dominic B. Santiago, Conrado Joshua V. Mataga, Elyjha S. Gabriel and Grecebio Jonathan D. Alejandro. 2021. Hedyotis hamiguitanensis (Rubiaceae: Spermacoceae), A New Species from Mt. Hamiguitan, Davao Oriental, Philippines and Its Systematic Position in Hedyotis. Webbia. 76(2); 195-202. DOI: 10.36253/jopt-10651
