Jacquemontia staplesii 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 : 29-31

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https://doi.org/ 10.11646/phytotaxa.69.1.5



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scientific name

Jacquemontia staplesii Buril

sp. nov.

Jacquemontia staplesii Buril View in CoL , sp. nov., Fig. 1 F–J View FIGURE 1

Type:— BRAZIL. Bahia: Lençóis, about 7–10 km, along the main Seabra-Itaberaba road, 41º26’S 12º28’S, 27 May 1980, R. M . Harley 22710 (fl.) (holotype SP!, isotypes SPF!, K!, NY!) .

Perennial shrub, ca. 40 cm high, erect, branched, lanate; trichomes T-shape, and 3–4-armed with the arms equal or unequal; internodes 4–8 mm long, leaves imbricate, densely imbricate at the apex of branches, hiding the inflorescences. Leaf blades 1.7–2.4 × 1.2–1.5 cm, chartaceous, entire, margins slightly revolute, ovate to orbicular, the base rounded to slightly cordate, the apex rounded to acute with a mucron, lanate, discolorous, veins usually apparent on both surfaces; petiole 1–2 mm long. Inflorescences umbelliform cymes, up to 17- flowered, sessile, usually terminal; bracteoles 0.5–1.5 × 0.1–0.3 cm, elliptic, margins sinuate, two per pedicel; pedicels ca. 2 mm long. Sepals unequal, membranaceous, pubescent, entire, the 2 outer 8–10 × 1–2 mm, linear to lanceolate, the base truncate to rounded, the apex caudate, slightly sinuate, the 3 inner 6 × 1.5 mm, lanceolate, the base rounded, the apex acuminate; corolla 1.2–1.5 cm long, funnelform, pale blue, weakly lobed, midpetaline bands glabrescent; stamens heterandrous, 2 longer ca. 1 cm long, 3 shorter ca. 7 mm long, anthers sagittate, ca. 1 mm long, oblong, the base cordate; nectary present, ovary ca. 1 mm long, oblong, glabrous, 2-locular, 2 ovules per locule, style ca. 8 mm long, stigmatic lobes 0.5–1 mm long, ovoid flattened. Fruits not seen. Fig. 1. F–J View FIGURE 1 .

MAP 1. Distribution of Jacquemontia grisea and Jacquemontia staplesii .

Distribution, Habitat and Conservation: —Endemic to Brazil in the Espinhaço Range, in the Chapada Diamantina of Bahia in Brazil (Map 1), occurring in caatinga vegetation. Since there are no data on abundance, this species should be considered as data deficient (DD) according to the IUCN (2001) criteria.

Etymology: —The epithet honours Dr. George Staples III, specialist in Convolvulaceae , who has contributed to the taxonomic revision of Brazilian species of Jacquemontia .

Observations: —In Brazilian herbaria, specimens of this species were found misidentified as Jacquemontia hallieriana Ooststr which is only known from the type. However, J. staplesii is significantly different based on the closely imbricate leaves that hide the inflorescences at the apices of the branches whereas in J. hallieriana the internodes are 1.5 cm long leaving the inflorescences exposed.. Moreover, the leaves of J. hallieriana are larger (ca. 6 × 4 cm) and its outer sepals are slightly rhombic. Jacquemontia hallieriana also appears to have shorter petioles, with almost sessile leaves.

Paratypes: — BRAZIL. Bahia: Abaíra, Riacho do Piçarrão de Osmar Campos , 13º23’S 41º48’W, 1000–1300 m alt., 8 May 1994, W GoogleMaps . Ganev 3226 (fl.) ( HUEFS!, NY!); Abaíra, Catolés, Samambaia, Cabeceira da Samambaia , 13º19’S 41º51’W, 1 June 2003, A. S GoogleMaps . Conceição , M. J. G . Andrade and M. V . Moraes 617 (fl.) ( HUEFS!); Lençóis, valley of Mucugezinho river , 12º27’48’’S 41º25’6’’ W, 486 m alt., 18 September 2002, L. P GoogleMaps . de Queiroz 7431 (fl.) ( HUEFS!) .


Departamento de Geologia, Universidad de Chile


Botanische Staatssammlung München


Instituto de Botânica


Universidade de São Paulo


Royal Botanic Gardens


William and Lynda Steere Herbarium of the New York Botanical Garden


Naturhistorisches Museum Wien


Universidade Estadual de Feira de Santana


Harvard University - Arnold Arboretum


Department of Botany, Swedish Museum of Natural History


University of the Witwatersrand


Conservatoire et Jardin botaniques de la Ville de Genève


Royal British Columbia Museum - Herbarium


Nationaal Herbarium Nederland, Leiden University branch


Museum National d' Histoire Naturelle, Paris (MNHN) - Vascular Plants

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