Utricularia hydrocarpa Vahl (1804: 200)

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 : 15

11. Utricularia hydrocarpa Vahl (1804: 200) ( Fig. 4 : H–I)

Aquatic submersed herbs, inflorescence up to 15 cm above water surface. Stolons and vegetative parts glabrous. Leaves alternate, divided into capillary segments, with 2 primary segments. Traps lateral, without appendages or 2 dorsal setaceous appendages, simple or branched. Inflorescence (chasmogamous) up to 10-flowered, emerged, flowers up to 1 cm distant from each other, and (cleistogamous) up to 5-flowered, submersed, flowers to 1 cm distant from each other. Peduncle pink or green; lateral spongy floats absent. Sterile bracts absent or one, basifixed, oblong, apex truncate, up to 2 mm long. Bract up to 3 × 2 mm, basifixed, oblong, apex truncate. Bracteoles absent. Pedicels ca. 1 cm long, longer or shorter than the calyx lobes. Calyx lobes lanceolate, apex acute, margin entire, without prominent nerves; upper lobe 2.5 × 1 mm; lower lobe 3 × 1.5 mm. Corolla lilac or white, with a white and yellow mark on the lower lip; upper lip 5 × 4 mm, lanceolate, apex rounded, obscurely bilobed; lower lip 5 × 8 mm, orbicular, apex rounded to bilobed; spur ca. 4 × 1.5 mm, conical, apex rounded, as long as the lower corolla lip or nearly so, not forming an angle of 90º with the latter in lateral view. Style and filaments short. Capsule elliptic to ovate, dehiscence circumscissile. Seeds lenticular to apparently globose, testa cells tiny, circular and circular-polygonal, with irregular processes at the margin.

Distribution:—This is the first record of Utricularia hydrocarpa in Roraima. The species is widely distributed in the Neotropics ( Taylor 1989) and occurs in all Brazilian regions ( Miranda et al. 2016); it is found in lakes and pools ( Taylor 1989) and in the VNP it was collected in areas of arboreal and grassy white-sand savannas, in shallow pools.

Taxonomic notes:— Utricularia hydrocarpa is distinguishable by the cleistogamous flowers at the base of the peduncle, by the pink or white corolla with bilobed lower lip, the conical spur with rounded apex and tiny circular and circular-polygonal testa cells.

Specimens:— BRAZIL. Roraima, Caracaraí, Viruá National Park : PPBio grid L1 - L2 / N2 - N3, 15 September 2010, S. M. Costa 744, T.D. M. Barbosa, C. Azambuja ; K. Cangani ( INPA!, UEC!) ; PPBio grid L3 / N4, 24 January 2011, S. M. Costa 857, K. G. Cangani ( INPA!, UEC!) ; “ Mata do Seu Nerí ”, 26 January 2011, S. M. Costa 900, K. G. Cangani ( INPA!, UEC!) ; “ Estrada Perdida ”, 18 July 2010, T.D. M. Barbosa 1173, S. M. Costa ( 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).