Begonia prasinimarginata S.Julia

국표에 없다.

Begonia prasinimarginata is a species of plant belonging to the genus Begonia. 

Begonia prasinimarginata - Wikipedia, the free encyclopedia

Begonia prasinimarginata S. Julia sp. nov. (Section Petermannia) Similar to Begonia heliostrophe Kiew (2001: 262) in its leaf shape and inflorescence type, B. prasinimarginata differs in its smaller stature, it grows to c. 8 cm tall (vs. to 125 cm tall as in B. heliostrophe), its leaves have very short petioles, 0.8–1.4 cm long with a lamina twice as long as wide, 9–14.5 × 5.5–6.5 cm and a broad silvery pale green border (vs. with a petiole 5–7 cm long and a plain green lamina, three times longer than wide, 10.5–19 × 3.5–6.5 cm), its male flowers have two tepals (vs. four tepals) and its fruit is smaller c. 1.2 × 1.4 cm (vs. 1.7–2.3 × 1.7–2.2 cm). Type: Diwol SAN 144346, Borneo, Sabah, Lahad Datu District, Danum Valley Field Centre, Sungai Ril, Danum Segama, 22 March 2000 (holotype SAN!). (Fig. 7) Low glabrous begonia. Stems decumbent and rooting at the nodes, erect apex to 8 cm tall, slightly woody, 2–3 mm diameter when dry, internodes 1.5–2.5 cm long. Stipules lanceolate, c. 5 × 2.5 mm, margin entire, apex acute, caducous. Leaves alternate, distant, oblique; petiole reddish brown, 0.8–1.4 cm long, grooved above; lamina dark green above with a broad silvery pale green border, 6–9 mm wide, thin in life, matt, ovate, asymmetric, 9–14.5 × 5.5– 6.5 cm, broad side 4–4.5 cm wide, basal lobe rounded, 2.5–3.5 cm long, margin minutely toothed, apex attenuate; venation pinnate, veins 3 on the broad side, branching once or twice, 2 veins on the narrow side, unbranched, 3 veins in basal lobe, impressed above, prominent beneath. Inflorescences protogynous, in the uppermost leaf axils, racemose with cymose branches with male flowers, c. 10 cm long, peduncle c. 5.2 cm long. Bracts caducous. Male flowers: pedicel rosy pink, c. 3 mm long; tepals 4, oval, 2–2.5 × c. 2 mm, rosy pink, inner 2 tepals slightly smaller, margin entire, apex acute; stamens >30, cluster globose, sessile; filaments c. 0.5 mm long; anthers oblong, 0.8–1 × c. 0.6 mm, apex rotund. Female flower: pedicel c. 4.5 cm long, reddish pink, glabrous; ovary reddish pink or greenish red, pendent, c. 16 x 13 mm; wings 3, equal, c. 3 mm wide; locules 3, placentas bilamellate with many ovules on both surfaces; tepals 5, reddish, outer tepals ovate, c. 10 × 9 mm, inner ones obovate, c. 11 × 5 mm, margin entire, apex rounded; styles 3, bright yellow, 1–1.5 mm long, divided to base, bifurcating, stigma widely Y-shaped, papillose forming a continuous twisted band. Capsules c. 1.2 × 1.4 cm, wings equal, triangular, widest midway, c. 5 mm wide, thinly fibrous, dehiscing between locules and wings, pedicel c. 22 mm long, fine and thread-like. ETYMOLOGY. Prasinus (leek green), referring to the conspicuous pale green margin of the lamina.

sandakania-20-051-085.pdf (archive.org)

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