Jacquemontia grisea Buril, 2012

Buril, Maria Teresa & Alves, Marccus, 2012, Two new species of Jacquemontia Choisy (Convolvulaceae) endemic to Bahia, Brazil, Phytotaxa 69 (1), pp. 27-32 : 29

Jacquemontia grisea Buril , sp. nov., Fig. 1 A–E

Type:— BRAZIL. Bahia: Barra da Estiva, Road on direction to Fazenda Brejões , 13º34’41’’S 41º23’41’’W, 1236 m alt., 3 July 2004, E. R . de Souza & M. N. S . Stapf 473 (fl.) (holotype HUEFS, isotype SP) .

Perennial shrubs, ca. 50 cm height, erect, few branched, the branches articulated, villous, hoary; trichomes Tshaped, one of the arms ca. 3mm long; internodes 1–5 mm long, leaves densely imbricate on the apex of the branches. Leaf blades 1–2.4 × 0.5–1 cm, chartaceous, entire, elliptic, ovate or obovate, the base rounded to cuneate, the apex acute to slightly acuminate, densely vilose, silver grayish sometimes tending to bluish, veins obscured by indumentum; sessile. Inflorescences capitulliform cymes, up to 5-flowered, sessile, globose, terminal; bracteoles ca. 7 mm long, falcate to linear, densely villose; pedicels ca. 1 mm long. Sepals unequal, membranaceous, entire, the 2 outer 7–8 × 2.5–3 mm, oblanceolate, the base cuneate, the apex acuminate, villous, middle one ca. 7 x 2 mm, asymmetric, the 2 inner ca. 6 × 1.5 mm, lanceolate, the base truncate, the apex acute, pubescent mostly on the middle region; corolla 1.2–1.5 cm long, funnelform, blue, weakly lobed, midpetaline bands pubescent; stamens heterandrous, 2 longer ca. 1 cm long, 3 shorter ca. 7 mm long, filaments with short trichomes at the base, anthers elliptic, ca. 1.5 mm long, base subcordate, apex rounded, anthers oblong, ca. 1 mm long, white; nectary present, ovary ca. 1 mm long, oblong, glabrous, 2-locular, 2 ovules per locule, style ca. 1 cm long, stigmatic lobes 0.5 mm long, ovoid flattened. Fruits not seen. Fig. 1. A–E .

Distribution, Habitat and Conservation: —Endemic to Brazil, this species is known only from the Espinhaço Range, in the state of Bahia (Map 1), and occurs in campos rupestres and cerrado vegetation. Due to insufficient data about population size, Jacquemontia grisea should be considered as Data Deficient (DD) according to the IUCN (2001) criteria.

Etymology: —The epithet grisea (from Latin), refers to the pure greyish (sometimes verging on bluish) colour of its leaves, which is apparent on live plants and dried specimens.

Observations: — Jacquemontia grisea is similar to Jacquemontia decipiens Ooststr. which is endemic to the southern part of the Espinhaço Range in the state of Minas Gerais. It differs by the presence of T-shaped and very long trichomes (vs. 5–6-armed trichomes in J. decipiens ) and capitulliform, multi-flowered inflorescences (vs. inflorescences with up to 7 flowers, and sometimes with a few axillary flowers, in J. decipiens ). In addition, bracts occur in J. grisea but are absent in J. decipiens , and the outer sepals are oblanceolate in J. grisea (vs. lanceolate in J. decipiens ).

Paratypes: — BRAZIL. Bahia: Abaíra , between Serra do Barbado and Serra da Itobira, 13º19’S 41º54’W, 1800 m alt., 20 October 1993, W . Ganev 2522 (fl.) ( HUEFS!); Catolés, road Catolés to Boa Vista , 13º19’S 41º50’W, 1200 m alt., 23 July 1992, W . Ganev 710 (fl.) ( HUEFS!, NY!); Mucugê , 12º58’S 51º20’W, 1000–1200 m, C. M . Pigozzo 54 (fl.) ( HUEFS!) .

Figures

FIGURE 1. A–E. Jacquemontia grisea. A. habit; B. leaf; C. trichome; D. sepals, on left the outer one, on right the inner one; E. gynoecium (drawn from the holotype E. R. de Souza & M.N.S. Stapf 473); F–J. Jacquemontia staplesii. F. habit; G. inflorescence enclosed by leaves; H. trichome; J. sepals, from left to right the outer to the inner (drawn from the holotype R. M. Harley 22710).