Utricularia guyanensis Candolle (1844: 11–12)

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 : 13

9. Utricularia guyanensis Candolle (1844: 11–12) ( Fig. 4 : B–C)

Marsh herbs, up to 20 cm tall.Stolons and vegetative parts glabrous. Leaves (not seen); traps lateral, without appendages. Inflorescence erect, up to 10-flowered, flowers ca. 1 cm distant from each other. Peduncle greenish or reddish; lateral spongy floats absent. Sterile bracts up to 1 mm long, basifixed, ovate, margin entire, equally distributed along the peduncle. Bract up to 1 × ca. 1.2 mm, basifixed, broadly ovate, margin entire, sometimes with a prominent nerve. Bracteoles <1 mm long, lanceolate, apex acute, margin entire. Pedicels up to 1 mm, shorter than calyx lobes. Calyx lobes equal, margin entire, green to yellow, apex reddish, without prominent nerves; upper lobe 2 × 2 mm, lanceolate, apex acute to rounded; lower lobe 2 × 1.5 mm, lanceolate, apex acute to rounded. Corolla yellow; upper lip 2.5 × 2 mm, ovate; lower lip 4 × 4 mm, orbicular, apex obscurely bilobed; spur up to 1 × 1 mm, cuneiform (wedge-shaped), always shorter than the lower lip of corolla and not forming an angle of 90º with the latter in a lateral view. Style and filaments elongate; filaments acutely bent in the middle, more or less parallel with inner surface of spur. Capsule ellipsoid, dehiscing by a ventral pore. Seeds numerous, ovoid, with reticulate surface, testa cells isodiametric, elliptic to circular.

Distribution:—We present the first record of Utricularia guyanensis for Roraima. This species occurs in northern South America and Central America ( Taylor 1989); in Brazil it occurs in the northern, northeastern and central-western regions ( Miranda et al. 2016). It grows in sandy, humid and saturated soils ( Taylor 1989), and in the Viruá National Park it was collected in grassy white-sand savannas with saturated soils.

Taxonomic notes:—According to Taylor (1989), the leaves of this species are filiform with acute apex, 0.3–0.4 mm wide; the peduncle is generally blackish after drying. Utricularia guyanensis differs from other species in the genus by the cuneiform (wedge-shaped) spur, elongated style and stamens, and the position of the style and stamen along the spur ( Fig. 4 : B–C).

Specimens:— BRAZIL. Roraima, Caracaraí, Viruá National Park : “Estrada Perdida”, 20 January 2011, M. C. E. Amaral 2011-27, C. F. Silva ( INPA!, UEC!) ; “Estrada Perdida”, 16 September 2010, S. M. Costa 756, T.D. M. Barbosa, F. N. Cabral ( INPA!, UEC!) ; “ Estrada Perdida ”, 25 January 2011, S. M. Costa 897, K. G. Cangani ( INPA!, UEC!) ; PPBio grid L4 / N4, 20 March 2011, S. M. Costa 919, T.D. M. Barbosa ( INPA!, UEC!) .

Figures

FIGURE 4. Utricularia gibba L. A. habit. Utricularia guyanensis A.DC.—B. inflorescence (detail). C. flower (lateral view, white line— position of stamens). Utricularia hispida Lam.—D–F. flower (front, posterior and lateral views).G. immature fruit. Utricularia hydrocarpa Vahl—H. inflorescence. I. flower (front view). Utricularia juncea Vahl—J. leaves. K. inflorescence (detail). L. flower (lateral view).