Utricularia subulata Linnaeus (1753: 18)

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 : 20

20. Utricularia subulata Linnaeus (1753: 18) ( Fig. 6 : F)

Marsh herbs, up to 25 cm tall. Stolons and vegetative parts glabrous. Leaves ca. 3 mm wide, linear to filiform. Traps lateral, dorsal appendages with few hairs. Inflorescence erect, up to 10-flowered, flowers up to 2 cm distant from each other. Peduncle greenish to blackish; lateral spongy floats absent. Sterile bracts 0.5–1 mm long, peltate, elliptic, apex acute, margin entire, equally distributed. Pedicels ca. 7 mm long, longer than the calyx lobes. Bract ca. 1 × 1 mm, peltate, elliptic to circular, apex and base acute to rounded, margin entire. Bracteoles absent. Calyx lobes equal, lanceolate to ovate, apex acute to rounded, margin entire, nerves absent or with 6–8 visible nerves not extending to the margin (mainly in fruit); upper lobe 1–1.5 × 1 mm, lower lobe 1.5–2 × 1.5 mm. Corolla yellow; upper lip 3–4 × 3 mm, broadly ovate, apex rounded; lower lip 5–6 × 8 mm, trilobed to obscurely trilobed, lobes with rounded apex; spur up to 5–6 × 1.5 mm, cylindrical, apex rounded or acute, 1–4-fid, as long as 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, globose to ellipsoid, surface reticulate with elongated testa cells.

Distribution:— Utricularia subulata is pantropical ( Taylor 1989) and recorded in all Brazilian regions ( Miranda et al. 2016). It is found in humid sandy savannas, shallow moist soils over rocks, ditches, pools, streams and swamps ( Taylor 1989). In the VNP this species occurs in areas of grassy white-sand savannas.

Taxonomic notes:—It differs from U. pusilla by the presence of appendages on the traps with few hairs and the linear leaves, and from U. triloba by the non-lanceolate calyx lobes with five prominent nerves extending to the acute apex, typical of U. triloba . It also differs from U.nervosa by the size of the corolla, larger in U. nervosa (1.2–1.8 cm long).

Specimens:— BRAZIL. Roraima, Caracaraí, Viruá National Park : PPBio grid L1 / N6, 12 September 2010, S. M. Costa 706, T.D. M. Barbosa ( INPA!, UEC!) ; PPbio grid L3 / N2, 13 September 2010, S. M. Costa 711, T.D. M. Barbosa ( INPA!, UEC!) ; PPbio grid L3 / N2, 13 September 2010, S. M. Costa 713, T.D. M. Barbosa ( INPA!, UEC!) ; PPBio grid N1 - N2 / L3 , 22 January 2011, S. M. Costa 830, T.D. M. Barbosa ( INPA!, UEC!) ; “ Estrada Perdida ”, 25 January 2011, S. M. Costa 875, K. G. Cangani ( INPA!, UEC!) ; “ Estrada Perdida ”, 16 July 2010, T.D. M. Barbosa 1120, S. M. Costa ( INPA!, UEC!) ; “ Estrada Perdida ”, 17 July 2010, T.D. M. Barbosa 1147, S. M. Costa ( INPA!, UEC!) ; “ Estrada Perdida ”, 18 July 2010, T.D. M. Barbosa 1159, S. M. Costa ( INPA!, UEC!) .

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.