Nomenclature
Accepted name/Authority/Place of publication:
Jacquemontia chrysanthera Buril
Type: Brazil. Bahia: Mun. Caetité, near Brejinho das Ametistas, caatinga, 14°11′60″S 41°39′36″W, 13 Feb 2009, M. T.Buril, B. Amorim, A. Benko, G. Cruz, D.Pinangé, J. Gitai, M. I. Martins & K. Veiga224 (holotype: UFP; isotypes: NY, SP).
Description
Habit:
Perennial vine, climbing, with slender stems, somewhat woody at base, much branched, velutinous; trichomes stipitatestellate, 5(−7)-rayed, the rays usually equal; latex white. Internodes 5.7–10.3 cm long.
Leaves:
Leaf blades 5.7–8.6×3.4–6.2 cm, papyraceous, entire to slightly sinuate, ovate, the base subcordate, the apex acuminate to apiculate, velutinous, hoary, yellowish when dried, the trichomes on the abaxial side longer than on the adaxial side, with 9 pairs of secondary veins. Petiole 0.8–2.3 cm long, pubescent.
Inflorescences:
Inflorescences compound dichasial cymes, umbelliform, usually ca. 30- flowered, rarely 7-12-flowered; peduncles 3.5–5.2 cm long, axillary, velutinous; bracts 5–8×1 mm, entire, linear, two at the base of each cyme, pilose.
Flowers:
Sepals unequal, the 2 outer 1.0–1.1×0.4–0.45 cm, chartaceous, thick, entire, oblong, the base truncate, the apex acuminate, velutinous, the 3 inner 0.7–0.8× 0.3–0.35 cm, entire, ovate, the base rounded, the apices acuminate, puberulent in the middle region, persistent. Corolla ca. 2 cm long, funnelform, without lobes between episepalic nervures, the apex of episepalic nervure ciliate, blue. Stamens heterandrous, the longer 2 ca. 0.7 cm long, the smaller 3, ca. 0.6 cm long; filaments with short unicellular trichomes at the base; anthers elliptic, ca. 2 mm long, the base subcordate, the apex rounded, bright yellow. Style ca. 1 cm long, exceeding the stamens, each stigmatic lobe ca. 1×0.6 mm, oval, flattened, white; nectary 5-lobate; ovary ca. 1 mm long, globose, glabrous, 2-locular, with 2 ovules per locule.
Pollen:
Tricolpate.
Fruits:
Fruit a capsule, ca. 5×4 mm, globose, opening by 8 valves.
Seeds:
Seeds 3–3.2 mm long, the dorsal face rounded, the margins with a thin, striate lateral ridge, ca. 0.2–0.4 mm wide, the surface minutely areolate.
References:
Buril, M.T. & Alves, M. 2011. A new species of Jacquemontia (Convolvulaceae) from northeastern Brazil. Brittonia, 63 (4): 436–441.
Conservation
IUCN Conservation ranking:
VU: Vulnerable
Conservation Status:
Jacquemontia chrysanthera occurs in the caatinga, a shrubby savanna habitat of the semi-arid region in Northeastern Brazil. This species is known only from Bahia and Pernambuco and should be classified as Vulnerable, according to IUCN Red List criteria (2001), because it occupies an area estimated at less than 2000 km ², and although it occurs in the Chapada Diamantina National Park, this is still a not totally protected area.
Classification:
Add new comment