Utricularia triloba Benjamin (1847: 248)

Costa, Suzana M., Bittrich, Volker & Do Amaral, Maria Do Carmo E., 2016, Lentibulariaceae from the Viruá National Park in the northern Amazon, Roraima, Brazil, Phytotaxa 258 (1), pp. 1-25 : 22

21. Utricularia triloba Benjamin (1847: 248) ( Fig. 6 : G)

Marsh herbs, up to 15 cm tall. Stolons and vegetative parts glabrous. Leaves ca. 3 mm wide, linear. Traps lateral, one pair of dorsal appendages branched. Inflorescence erect, up to 10-flowered, flowers up to 1.5 cm distant from each other. Peduncle greenish; lateral spongy floats absent. Sterile bracts up to 1 mm long, peltate, elliptic, apex acute, margin entire or ciliate, equally distributed. Pedicels ca. 5 mm, longer than the calyx lobes. Bract 1 × 1 mm, peltate, elliptic, apex and base acute to rounded, margin entire. Bracteoles absent. Calyx lobes equal, 1–1.5 × 1–1.5 mm, lanceolate, apex acute, margin entire, with 5 prominent nerves extending to the apex. Corolla yellow; upper lip ovate to lanceolate; lower lip deltoid, trilobed to obscurely trilobed; spur ca. 6 × 1.5 mm, conical, apex acute or 2–3-fid, slightly longer than the lower lip of corolla and not forming an angle of 90º with the latter in lateral view. Style and filaments short. Capsule globose, dehiscing by a ventral pore. Seeds numerous, ellipsoid, testa cells elongated.

Distribution:— Utricularia triloba occurs in Central and South America ( Taylor 1989) and throughout Brazil ( Miranda et al. 2016). It grows in humid sandy savannas, margins of gallery forest and wet open grasslands ( Taylor 1989). In VNP this species occurs in an area of grassy white-sand savanna.

Taxonomic notes:— Utricularia triloba differs from other similar species by the calyx with five prominent nerves that extend to the acute apex of each lobe.

Specimens:— BRAZIL. Roraima, Caracaraí, Viruá National Park: PPBio grid, 12 September 2010, S.M. Costa 709, T.D.M. Barbosa (INPA!).

Figures

FIGURE 6. Utricularia sandwithii P.Taylor A–C. flower (front, lateral—inferior lip of corolla partially removed, note the spur—and posterior views). Utricularia simulans Pilg.—D. inflorescence (detail). E. flower (front view). Utricularia subulata L.—F. inflorescence (detail); G. flower (front view). Utricularia triloba Benj.—H. inflorescence (detail of herbarium specimen, note the nerves on calyx lobes); Utricularia viscosa Spruce ex Oliv—I. inflorescence (detail). J. peltate sterile bract. K. flower (posterior view). L. fruit.