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Heenan, P.B.; Molloy, B.P.J.; de Lange, P.J. 2003: Species of Convolvulus (Convolvulaceae) endemic to New Zealand. New Zealand Journal of Botany 41(3): 447–457.

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Heenan, P.B.; Molloy, B.P.J.; de Lange, P.J. 2003: Species of Convolvulus (Convolvulaceae) endemic to New Zealand. New Zealand Journal of Botany 41(3): 447–457.
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Low-growing perennial herb, with creeping rhizomatous stems, short ascending to spreading branches, and lianoid stems up to 20 cm; lianoid stems with a sparse to moderate covering of retrorse hairs. Leaves in rosettes and alternate on stems, 6.5–11.5 × 5.0–12.5 mm, deltoid, deltoidovate to ± broad-oblong, grey, grey-green, to silvergrey; moderately to densely hairy, rarely sparsely hairy, hairs antrorse and appressed; veins prominent and strongly translucent; margin undulate, occasionally sinuate, or with 4–6 pairs of teeth; base truncate, obtuse, occasionally oblique or slightly cordate; apex usually retuse, occasionally obtuse; petiole channelled, sparsely to moderately covered with retrorse and antrorse hairs. Pedicel 5–30(–55) mm long, 0.4–1.2 mm diam., moderately hairy. Sepals 3.9–4.1 × 3.5–3.8 mm, obovate to ovate, green; abaxial surface sparsely to moderately hairy, adaxial surface glabrous; margin fimbriate and translucent; apex subacute to obtuse. Corolla 12– 19 mm long in bud, 20–25 mm wide when open, white, rarely pink, five lobes fused their full length, lobe apex fringed with hairs; tube 5–8 mm long, palegreen; abaxial surface with mid-petaline pink bands with sparse appressed hairs on upper half. Nectary annular, 0.3–0.4 mm tall, yellow. Style 2-cleft, white; fused portion 6.0–9.0 mm long, c. 0.2 mm wide; stigmata 2.5–4.0 × c. 0.5 mm. Ovary c. 1.0 × 1.0–1.2 mm, cream. Filaments 4.0–4.6 mm long, c. 0.5 mm wide at base, tapering to c. 0.2 mm at apex, white; margin with scattered short hairs on lower half; fused to base of corolla tube. Anthers 1.7– 2.0 mm long, white. Capsule 5.8–6.2 mm long, 4.5– 7.5 mm wide, chartaceous, globose, with 2–4 seeds, lower half enclosed in persistent calyx, style base remnant persistent. Seeds* segment-shaped and broader toward apex with a rounded dorsal and two flattened lateral faces meeting at an acute ventral edge, or rounded and broadly obovate without distinct angles, almost triangular to terete in section; 2.8–3.9 × 2.4–3.0 mm; apex and base rounded; hilum concave. Testa black-brown overlaid and ornamented with grey nut-brown, dull, glabrous, moderately covered in low ridges and tubercules, sometimes forming ridges on margins. FL Nov–Jan; FT Dec–Mar. *Seed descriptions are based on Webb & Simpson (2001).
Low-growing perennial herb, with creeping rhizomatous stems, short ascending to spreading branches, and lianoid stems up to 80 cm; lianoid stems with a sparse to moderate covering of retrorse hairs. Leaves in rosettes and alternate on stems, 6–17 × 5–12 mm, deltoid, deltoid-ovate, broad-oblong, green; glabrous or with a few scattered hairs near junction of lamina and petiole; veins immersed on adaxial surface; margin entire to undulate, irregularly lobed; base truncate, sometimes oblique; apex usually retuse, occasionally obtuse to subacute; petiole channelled, sparsely to moderately covered with retrorse and antrorse hairs. Pedicel 8–18 mm long, 0.6–1.3 mm diam., sparsely to moderately hairy. Sepals 3.6–4.0 × 2.1–2.6 mm, obovate to ovate, green; abaxial and adaxial surfaces glabrous; margin fimbriate and translucent; apex subacute to obtuse. Corolla 7–13 mm long in bud, 10–16 mm wide when open, white, five lobes fused for > 3⁄4 of their length; lobe apex fringed with hairs; tube 4–6 mm long, pale green; abaxial surface with mid-petaline green bands with sparse appressed hairs on upper third. Nectary annular, 0.3–0.4 mm tall, yellow. Style 2-cleft, white; fused portion1.6–3.0 mm long, 0.4–0.5 mm wide; stigmata 1.0– 2.5 × c. 0.5 mm. Ovary c. 1.0 × c. 1.0 mm, cream. Filaments 1.7–3.0 mm long, c. 0.5 mm wide at base, tapering to 0.2 mm at apex, white; margin with scattered short hairs on lower half; fused to base of corolla tube. Anthers 1.7–2.0 mm long, white. Capsule 5–6 mm long, 5.0–6.5 mm wide, chartaceous, globose, with 2–4 seeds, lower half enclosed in persistent calyx, style base remnant persistent. Seeds segment-shaped or hemispherical, broader toward apex, with a broadly rounded dorsal surface and usually two flattened or concave lateral faces meeting at a rounded or flattened ventral ridge, sometimes with a single flattened ventral surface, almost triangular in section; 3.1–3.9 × 2.3–3.3 mm; apex and base rounded; hilum concave. Testa brown and ornamented, grey nut-brown, dull, glabrous, densely covered in distinct irregular tubercles and ridges, these often narrow and forming broken ridges along margins of faces. FL Oct–Feb; FT Dec–Mar.

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Key to New Zealand species of Convolvulus

1
Lianoid stems up to 80 cm long; leaves usually glabrous, green; corolla < 18 mm diam. when open, mid-petaline band pale green; seed testa densely covered in distinct irregular tubercules and ridges
Lianoid stems usually less than 30 cm long; leaves moderately to densely hairy, grey to silvery grey; corolla > 18 mm diam. when open, mid-petaline band pink; seed testa moderately to densely covered in low, sometimes inconspicuous tubercules and ridges
2
2
Lianoid stems up to 30 cm long; leaves heterophyllous on the same plant, deltoid, deltoid-ovate, broad oblong, oblong, to ± hastate, at least some with a filiform or linear terminal lobe and smaller basal lobes
Lianoid stems up to 20 cm long; leaves ± uniform, deltoid, deltoid-ovate, to broad-oblong, lacking filiform or linear terminal lobes and smaller basal lobes

Reproduced with permission from New Zealand Journal of Botany and The Royal Society of New Zealand Te Apārangi.

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dbce9a72-eac3-463e-9827-ae2fcd6cf8cb
reference
Names_Plants
12 May 2004
12 May 2004
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