Begonia mamedeana E.L. Jacques & Gomes da Silva, 2018

Jacques, Eliane De Lima, 2018, Four New Brazilian species of Begonia (Begoniaceae), Phytotaxa 381 (1), pp. 86-94 : 87-89

Begonia mamedeana E.L. Jacques & Gomes da Silva , sp. nov. ( Figs. 3. A–G )

Begonia mamedeana is most similar to B. stenophylla A. DC. although differing by having fruits that are larger (1.5–2 cm vs. 0.7–1.1 cm long.), oblong (vs. oblong to oval), with equal wings (vs. unequal) and a tomentose indumentum (vs. villous).

Type:— BRASIL. Rio de Janeiro: Paraty, Fazenda São Roque, 570 m, 4 August 1988, E. L. Jacques, M. C. Marques, A. Almeida, J. Caruso et al. 33 (holotype RB! isotype RBR!).

Description:—Terrestrial, subshrub, approximately 2 m tall, branches, petioles, peduncles, and pedicels ferruginous-tomentose to glabrescent, hairs tufted with multicellular branches, non glandular, at the base of the tufted hairs there is at least one glandular, stalked, capitate hair. Stem striated longitudinally, internodes 0.8–1.1(–2.5) cm long, tomentose-ferruginous to glabrescent. Stipules persistent, lanceolate, 1.3–4 cm long, with a crest of trichomes on the principal vein, ferruginous-tomentose glabrescent towards the apex, apex setiferous. Leaves simple, petiole cylindrical, 1–2 cm long, with hairs tufted, branches multicellular, non glandular, at base of the tufted hairs there is at least one glandular, stalked, capitate hair; blades elliptic to oblong-lanceolate, 12–18 × 2.7–4.5 (–5.4) cm, adaxial surface green, glabrous, abaxial surface rose to vinaceous, tomentose-ferruginous, with hairs tufted, branches multicellular non glandular, vein rose to vinaceous, margins serrate, but sometimes only in the upper third, apex acuminate, base markedly to slightly asymmetrical, venation craspedodromous. Inflorescence 3–4-branched cyme; peduncles 3–5 cm long, bracts persistent, lanceolate, 4–9 × 1–2 mm, pilose, especially on the principal vein. Male flowers with tepals 4, external pair of tepals elliptic to ovate, 5–6 × 3–4 mm, pubescent at base, internal pair of tepals elliptic, ovate to obovate, ca. 3 × 1 mm, glabrous, stamens 10–22, free, on a conical receptacle, approximately 1 mm long, filaments 0.5–1 mm long, anthers oblong, 0.5–1.2 mm long, rimose, latrorse, connectives prominently projecting, ca. 0.1 mm long, obtuse. Female flowers: bracteoles 2, persistent, elliptic, 4–4.5 × 3 mm, located on the apex of pedicel, margins ciliate, apex aristate; tepals 5, equal to subequal, elliptic to obovate, 7–12 × 2–2.5 mm long, hypanthium ca. 13 × 12 mm, pubescent, placentae entire; styles 3, ca. 2 mm long, connate from their bases to 2 mm in height. Capsules oblong, 1.5–2.5 × 1.3– 1.5 cm (including the wings), puberulous, apex obtuse, base obtuse, central region elliptic, wings equal to subequal, with tepals persistent, seeds oblong, ca. 430 μm long.

Etymology:—The specific epithet honors Dr. Maria Candida Henrique Mamede, a researcher at the Instituto de Botânica, São Paulo State, who dedicated her time to training specialists in the family Begoniaceae .

Phenology: —Flowering from April to May and from October to November. Fruiting in April and August and from October to November.

Distribution and ecology: —The species occurs in the Atlantic Forest in the states of Rio de Janeiro and São Paulo. It grows in shady localities, in submontane forests at elevation of 300 to 620 m.

Additional specimens examined (paratypes):— BRAZIL. São Paulo: Picinguaba, próximo a BR 101 , 2 October 1975, D. Araújo et al. 837 ( RB!). Ubatuba, November 1990, A. Furlan et al. 1302 ( SP!). Entre Rio de Janeiro e São Paulo: entre Paraty e Ubatuba , Morro do Cuscuzeiro , 20 November 1990, C. Farney et al. 2462 ( RB!). Rio de Janeiro: Paraty, Serra de Paraty , October 1865, ex Herbário Capanema ( RB 75942 !) ; ib., Córrego Trindade , 9 May 1991, L. Sylvestre et al. 464 ( RB!) ; ib., Ponta de Trindade , 13 Abril 1978, P. P. Jouvin 156 ( RB!) ; ib., km 208, estrada Rio-Santos, sentido São Paulo / Paraty , 17 October 1990, V. L. G. Klein et al. 911 ( RB!) ; ib, Parque Nacional da Serra da Bocaina, estrada Rio-Santos, entre Patrimônio e divisa RJ/ SP, Vale do Cariri , Parque Nacional da Serra da Bocaina , 14 November 2014, E. P. Fernandez et al. 109 ( RB!) .

Figures

FIGURE 3. A–G. Begonia mamedeana E.L. Jacques. A, Flowering branch; B, Male flower bud; C, Male flower; D, Stamens; E, Female flowers; F, Stigma; G, Fruits. H–M. Begonia rivularis E.L. Jacques (del from R. Lupo). H, Habit; I, Bracts; J, Male flower; K, Stamens; L, Female flowers; M, Stigma. (A, from Furlan 1056; B–F, from Fernandez 109; G, from Jacques 33; H, J–M from Walter 1284; I, from Nave 1206).