Further discoveries in the ever-expanding genus Begonia (Begoniaceae): fifteen new species from Sumatra Author Hughes, Mark Royal Botanic Garden Edinburgh, 20 a Inverleith Row, EH 3 5 LR, UK. & Corresponding author: m. hughes @ rbge. ac. uk m.hughes@rbge.ac.uk Author Girmansyah, Deden Herbarium Bogoriense, Botany Division, Research Center for Biology, Indonesian Institute of Sciences, Cibinong Science Center (CSC), Jl. Raya Jakarta-Bogor Km 46, Cibinong, Bogor 16911, Indonesia. & Email: deden _ bo @ yahoo. com deden_bo@yahoo.com Author Ardi, Wisnu Handoyo Center For Plant Conservation-Bogor Botanic Garden, Jl. Ir. H. Juanda No. 13, P. O. Box 309, Bogor 16003, Indonesia. & Email: wisnu. handoyo. ardi @ lipi. go. id handoyo.ardi@lipi.go.id text European Journal of Taxonomy 2015 2015-12-21 167 1 40 journal article 22343 10.5852/ejt.2015.167 72b00f76-b85d-47c0-877f-511110a6a0f4 2118-9773 3805815 Begonia karangputihensis Girm. sp. nov. § Reichenheimia urn:lsid:ipni.org:names:77151643-1 Figs 2 , 8 Diagnosis Begonia karangputihensis differs from the peltate B. goegoensis which is also native to West Sumatra in being a smaller plant, with smaller (up to 7 cm wide, not c. 9–15 cm wide), less rugose leaves, terete petioles (not triangular) and flowers with flat membranous tepals (not cup-shaped and fleshy). Etymology The epithet is derived from Bukit Karang Putih, an area of limestone within Lubuk Kilangan district, West Sumatra , near the Semen Padang mine. In English the name of the area means “white coral hill”. Type SUMATRA : West Sumatra , Bukit Karang Putih, near Padang, 364 m , 17 Jun. 2011 , Puglisi, Hughes, Girmansyah & Roki CP 53 (holo-: BO ; iso-: E ). Additional material SUMATRA : West Sumatra , Bukit Karang Putih, 16 Feb. 1981 , Hotta et al. 345 ( ANDA ); ibid., 28 Mar. 1989 , Masniati 01 ( ANDA ); ibid., 17 Jul. 2011 , Puglisi et al. CP 57 ( BO , E ). Description Erect lithophytic acaulescent herb, 15–20 cm tall, often found in shallow caves; stem rhizomatous, internodes 0.5–1 cm long. Stipules persistent, glabrous, 10 mm long, broadly triangular, keeled only towards the apex, apex acute. Leaves: petiole 8–15 cm long, terete, glabrous; lamina basifixed on juvenile plants and peltate on mature individuals, basifixed leaves with base cordate, lobes not overlapping, peltate leaves ovate, subsymmetric to symmetric, 8.5–11 × 5–7 cm , upper surface light green, flushed reddish in centre on mature plants, glabrous on both sides, venation palmate-pinnate with 7(–8) main veins; margin sub entire to shallowly dentate, with cartilaginous recurved teeth at the end of the veins, apex acute to shortly acuminate. Inflorescences axillary, total length 15–20 cm , cymose, branching 2–5 times, with 10–20 flowers, bisexual, protandrous; primary peduncle 12.5–17 cm long; bracts caducous, basal pair sub-orbicular, 5 × 4 mm , subsequent pairs obovate, c. 3 mm long, margin entire. Male flowers: pedicel 10–18 mm long, glabrous; tepals 4; outer tepals 2, sub orbicular, membranous, 9 × 9 mm , white blushing pink at the base adaxially, glabrous, inner tepals elliptic, 7 × 3 mm , white; androecium yellow, globose, on a 0.5 mm long column; stamens 70–80; filaments unequal, basal ones shortest, 0.25–0.75 mm long; anthers 0.6 mm long, oblong-obtriangular, dehiscing through slits the whole length of the anther, slits positioned laterally. Female flowers: pedicel 10–15 mm long, glabrous; ovary green, glabrous, 10 × 10 mm including the wings; capsule ellipsoid, 8 × 4 mm , ellipsoid, 3-locular, placentae entire; wings 3, subequal, 10 × 2 mm , rounded, 2 slightly smaller ones rounded at the base, the other retuse; tepals 3–4, outer tepals 2, 8 × 8 mm , suborbicular, white, inner tepals 1–2, elliptic, 7 × 3 mm , white; stigmas 3, deep yellow, forked once and once spirally twisted, semi-persistent. Fruit recurved on a stiff 10–20 mm long pedicel, the two smaller wings held horizontally forming a splash cup; total size 6–9 × 9–14 mm , wings 2–4 mm wide; apex obtuse. Fig. 8. Begonia karangputihensis Girm. sp. nov. A . Habit. B . Male flower. C . Plant with young leaves showing transition from basifixed to peltate. D . Mature fruit on a recurved pedicel. E . Ovary. F . Female flower.A,C, D taken at the type locality of Bukit Karang Putih; the floral insets B, E, F were photographed from plants in cultivation at the Royal Botanic Garden Edinburgh, accession 20111545. Scale bars on insets: B, D–F = 1 cm; C = 10 cm. Distribution and habitat Endemic to the Bukit Karang Putih limestone near Padang in West Sumatra ( Fig. 2 ), where it grows on cliffs and in shallow caves. Conservation status We assess B. karangputihensis to be Vulnerable under criteria VUD2 ( IUCN 2012 ), as the type locality is only 1 kilometre away from an industrial limestone mine and just outside the edge of Kerinci Seblat National Park.