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| Acranthera collina C. W. Lin & C. H. Lee
in Lin & Lee, 2019
DOI: 10.18942/apg.201904
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Acranthera collina (Rubiaceae), a new species from Sarawak, Malaysia, on the island of Borneo, is described and illustrated. Acranthera collina resembles A. bullata Merr. but is easily distinguished by its ca. 10 pairs of lateral veins (vs. 13–15 pairs), 6-merous flowers (vs. 5-merous), golden yellow corolla (vs. red) and anthers ca. 5 mm long (vs. 10 mm long).
Key words: Acranthera, Borneo, new species, Rubiaceae, Sarawak
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| Fig. 2. Acranthera collina C. W. Lin & C. H. Lee. A. Habit; B. Stipule; C. Bract; D. Corolla, face view; E. Calyx and ovary; F. Vertical section of ovary; G. Vertical section of corolla; H. Stamens; I. Stamens and style; J & J'. Stamens, ventral and side views; K. Style; L. Fruit. |
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| Fig. 3. Acranthera collina C. W. Lin & C. H. Lee. A & B. Habit and habitat; C. Stem, showing stipules; D. Inflorescence; E. Portion of adaxial leaf surface; F. Portion of abaxial leaf surface; G. Basal part of corolla; H. Vertical section of corolla; I. Stamens and style (left), side (center) and ventral (right) views of stamen; J. Ovary and calyx, also showing vertical section of ovary; K. Fruits; L. Vertical section of an immature fruit. |
Acranthera collina C. W. Lin & C. H. Lee, sp. nov.
Acranthera collina resembles A. bullata Merr. (1937: 284) in having bullate obovate leaves, a short stature and an erect habit, but differs in having fewer lateral veins (10 or 11 pairs in A. collina vs. 13–15 pairs in A. bullata), 6-merous flowers (vs. 5-merous), golden yellow corolla (vs. red), and smaller anthers (ca. 5 mm long in A. collina vs. 10 mm long).
Distribution and habitat. Endemic to Sarawak. Currently known only from the Serikin area (Fig. 1); lowlands in mixed dipterocarp forest on riverbank and at base of limestone hills in semi-shaded and consistently humid areas, ca. 100 m elevation.
Etymology. the epithet collina refers to the lowland mountains where Acranthera collina was collected.
Che-Wei Lin and Chi-Hung Lee. 2019. Acranthera collina (Rubiaceae), A Splendid New Species from the Serikin Area, Kuching Division, Sarawak, Malaysia. Acta Phytotax. Geobot. 70(3); 189–194. DOI: 10.18942/apg.201904
