Burmeistera marginata H. Karst. & Triana, Linnaea

González, Favio, 2023, Taxonomic revision of Burmeistera (Campanulaceae-Lobelioideae) in Colombia, Phytotaxa 615 (1), pp. 1-113 : 61

30. Burmeistera marginata H. Karst. & Triana, Linnaea 28: 445. 1856.

Type :— COLOMBIA. Quindío: “Crescit in vicinitate pagi Consota in monte Quindiu” 1350 m, Jan 1852 (fl), J. J. Triana 1585 (lectotype P! [ P00408889 ] p.p.), designated here; isolectotype: BM! [ BM000947547 ]). Figs. 14 , 16A–C .

Upright to climbing herbs up to 60 cm tall. Stem glabrous. Petiole 9–25 mm long, glabrous; blade elliptic to lanceolate, 8–19 × 2.0– 5.5 cm, glabrescent above, tomentose beneath, base decurrent, apex acuminate, margin thoroughly finely toothed, teeth of two size classes, sharp, hydathodes 5 to 8 per cm, secondary veins 12 to 15 per side, intramarginal vein present, continuous. Peduncle 8–10 cm long, glabrous, ebracteolate. Hypanthium narrowly cylindric to obconic, 10–15 × 2–3 mm, glabrous. Calyx lobes ovate, 2–4 × 0.5–1.5 mm, ascending, glabrous, basally spaced by sinuses 0.8‒1.2 mm wide, margin entire, apex obtuse. Corolla green occasionally variegated with purple, glabrous; tube 0.8–1.0 cm long, 1.5–3.0 mm diatemer at its mid- and distal portions, inflated proximally; lobes ovate, strongly falcate, apex acuminate, dorsal lobes 10–12 × 3 mm, lateral lobes, 5‒6 × 2.5‒3.5 mm, ventral lobe ca. 4 × 2 mm. Synandrium 2.6–3.2 cm long, exserted up to 1.5 cm; filament tube 2.2–2.5 cm long; anther tube 4–7 mm long, glabrous, ventral anthers ebarbate. Berries narrowly cylindric, 10–20 × 3–5 mm.

Phenology: — Burmeistera marginata sets flowers and fruits in January, March, May, July, August, November and December.

Distribution, ecology and conservation status: — Burmeistera marginata is restricted to Colombia. Its disjunct distribution includes the type locality in Quindío, and additional localities from sub-Andean forests of the department of Nariño, at elevations between 873 and 1850 m. Following the IUCN´s (2022) criteria [B1(EOO) and B2(AOO), conditions (a) and (b), and C2(a)(i)], this species qualifies as Critically Endangered.

Notes: — Burmeistera marginata is similar to B. cylindrocarpa (see distinctive traits under the latter).

Burmeistera marginata was described based on a colection by J. J. Triana (“Crescit in vicinitate pagi Consota in monte Quindiu”). There are two sheets that correspond to the original description, and collected in the cited locality, one with Triana´s number 1585 (deposited at P), and a second one with the number 3069.1/8. Thus, the sheet deposited at P [ P00408889 ] is here chosen as the lectotype (pro parte), because it is the most complete, and has more handwritten information on the label. However, it is likely that the loose leaf on the lower portion of the sheet does not correspond to B. marginata .

Additional specimens examined:— Nariño. Barbacoas, corr. Junín, 1200 m, 5 Dec 1986 (fl, fr), O. de Benavides 7627 ( PSO) ; Barbacoas, corr. Altaquer, sitio El Barro, 1300 m, Mar 1995 (fr), J. Fernández et al. 12394 ( COL) ; trail from La Planada to Pielapi, 1°4´N, 78°2´W, 1600‒1800 m, 22 Jul 1988 (fl, fr), A. Gentry et al. 63670 ( PSO) ; Ricaurte, camino Las Cruces-Curcuel, 1°08´N, 77°51´W, 1700‒1800 m, 4 Nov 1995 (fl), M. González et al. 1254 ( PSO) ; along road between Altaquer and Junín, km 129‒130, 1130 m, 30 Jan 1976 (fl), J. L. Luteyn et al. 5091 ( COL) ; Ricaurte, Reserva Natural La Planada , hacia El Hondón, 15 Aug 1994 (fl), H. Mendoza 709 ( PSO) ; Ricaurte, entre Pialapi y El Arrayán , 14 Nov 1967 (fl), L. Mora 4054 ( COL) ; Ricaurte, Reserva Natural La Planada , 1850 m, 11 Jul 1991 (fl, fr), F. Stiles 566 ( COL) .

Figures

FIGURE 14. Distribution of Burmeistera hippobromoides, B. ibaguensis, B. kalbreyeri, B. killipii, B. loejtnantii, B. longifolia, B. luteynii and B. marginata.

FIGURE 16. A–C. Burmeistera marginata (Triana 1585, type), leaves (A), leaf margin (B) and flower (C). D–G. B. microphylla (Romero 2320), leaf (D), leaf margin (E), flower (F) and berry (G). H, I. B. multipinnatisecta (Galeano et al. 724, type), leaf (H) and flower (I). J. B. mutisiana (Humboldt & Bonpland s.n., type), leaves and flowers. Scale bars: 1 cm in A, J; 1 mm in B, E, G; 5 mm in C, D; 2 mm in F, H, I.