Elaeocarpus mahamayensis (Elaeocarpaceae), a new endemic species from the Knuckles Mountain Range in Sri Lanka Author Silva, Nilanka 0009-0006-5111-2629 Postgraduate Institute of Science, University of Peradeniya, Sri Lanka & Department of Botany, University of Peradeniya, Peradeniya, Sri Lanka & nilankadulanisilva @ gmail. com; https: // orcid. org / 0009 - 0006 - 5111 - 2629 nilankadulanisilva@gmail.com Author Yakandawala, Deepthi Postgraduate Institute of Science, University of Peradeniya, Sri Lanka & Department of Botany, University of Peradeniya, Peradeniya, Sri Lanka Author Yakandawala, Kapila 0000-0001-5304-4603 Department of Horticulture & Landscape Gardening, Faculty of Agriculture & Plantation Management, Wayamba University of Sri Lanka, Sri Lanka & kapilay @ wyb. ac. lk; https: // orcid. org / 0000 - 0001 - 5304 - 4603 kapilay@wyb.ac.lk text Phytotaxa 2023 2023-09-21 616 1 1 26 http://dx.doi.org/10.11646/phytotaxa.616.1.1 journal article 10.11646/phytotaxa.616.1.1 1179-3163 8389116 Key to the species of Elaeocarpus occurring in Sri Lanka 1. One anther valve tipped with a brush of hairs.................................................................................................................... E. serratus - Anther valves not tipped with brush of hairs.....................................................................................................................................2. 2. One anther valve elongated into a beak or bristle; fruits ovoid-cylindrical, 1–1.5 cm across, mature fruit blue .............................3. - Anther valves without beaks or bristles; fruits globular or sub-globular-ovoid, 2.5 cm or more across, mature fruits green or red .. ...........................................................................................................................................................................................................4. 3. Leaf blades ovate, apex acuminate, margin shallowly serrate-crenate; domatia present .............................................. E. ceylanicus - Leaf blades lanceolate, long-attenuate at apex, margin more or less coarsely serrate-crenate; lower face with domatia as large glandular pits in axils of lateral nerves.......................................................................................................................... E. glandulifer 4. Leaf blades pubescent on abaxial surface .........................................................................................................................................5. - Leaf blades glabrous on abaxial surface............................................................................................................................................6. 5. Leaf blades rotundate, apex obtuse; midrib and lateral nerves strongly raised on lower face; rusty brown with domatia along the lateral nerves..................................................................................................................................................................... E. montanus - Leaf blades oval, apex obtuse or short-acuminate; domatia absent .............................................................................. E. subvillosus 6. Leaf margins revolute; sepal brownish green colour; midrib smooth prominent yellow; fruit globular green ....... E. mahamayensis - Leaf margins not revolute (rarely revolute in E. taprobanicus ); sepals red to brownish red; fruit globular green to red.................7. 7. Leaf apices are obtuse to rounded, not narrowed into a short blunt point at the extreme apex; outer surface of petals sparsely to medium densely hairy throughout the undivided part................................................................................................ E. taprobanicus - Most leaf apices acute to obtuse, usually narrowed gradually or abruptly in to a short, blunt point; outer surface of petals glabrous or only sparsely hairy in lower half to third of undivided part..........................................................................................................8. 8. Leaves coriaceous, obovate (never almost elliptic); Inflorescence axis often over topping upper most leaves; bracts often persistent to anthesis ........................................................................................................................................................................ E. coriaceus - Leaves chartaceous, narrowly to broadly elliptic or slightly obovate; Inflorescence axis below the upper most leaves; bracts earlycaducous ............................................................................................................................................................................................9. 9. Inflorescence 15–25 flowered; sepal 3–4.5 mm long, petals 3–5.2 mm long with 17–22 divisions; stamens 16–1 smooth globular stone .................................................................................................................................................................................. E. amoenus - Inflorescence 9–15 flowered; sepal 4.5–6 mm long, petals 5–7.2 mm long with 25–32 divisions, stamens 30–35, rough stone....... ........................................................................................................................................................................................ E. hedyosmus