Lobelia proctorii Argent & P.Wilkie

Lammers, Th. G., 2011, Revision of the Malesian species of Lobelia section Rhynchopetalum (Campanulaceae: Lobelioideae), Blumea 56 (3), pp. 218-224 : 223

4. Lobelia proctorii Argent & P.Wilkie

Lobelia proctorii Argent & P.Wilkie in Argent et al. (2007) 158. — Type: Argent & Reynoso 8998 (holo PNH, not seen; iso E, K, L), Philippines, Sibuyan Island, Romblon Province, Mt Guiting Guiting, Camp 3 above Magdiwang village , on ridge leading to Mayos Peak , c. 1400 m, 24 Aug. 1989.

Plants lacking rhizomes. Stems woody, 0.4 –0.6 m tall, 10–12 mm diam, simple, erect, glabrous. Leaves sessile, apically rosulate; lamina linear, 6–15 by 0.3–0.6 cm, chartaceous, glabrous; apex acuminate; base attenuate; margin callose-serrate, the teeth incurved. Inflorescence pedunculate, 35– 50-flowered, simple; peduncle 11–12 cm long, moderately short-pubescent; bracts linear, 22– 35 by 1.5– 4 mm, 4.2 –5.5 times longer than their pedicels, glabrous, acuminate at apex, the margin entire or sparsely denticulate; pedicels ascending to spreading, 4 – 8 mm long, bibracteolate at middle, densely short-pubescent; bracteoles linear, 2 – 2.5 mm long. Hypanthium campanulate, 4 – 4.5 by 4 – 4.5 mm, moderately short-pubescent and scurfy-scaly; base rounded. Calyx lobes linear-triangular or subulate, 5 –7 by 1–1.8 mm, 1.2–1.5 times longer than hypanthium, erect, scurfy-scaly toward base; apex acute; margin entire or with 1 pair of low teeth. Corolla green suffused heavily with dark purple, sub-bilabiate, 22– 23 mm long, 5 – 6 times longer than hypanthium, externally sparsely short-pubescent and scurfy-scaly; tube straight, 9 –10 by 2 –4 mm, 3.5 – 5 times longer than broad, tapering from base to mouth; dorsal lobes linear, 12–14 by 0.8 –1 mm; ventral lobes linear, 11–12 by 0.8–1 mm, distinct. Staminal column exserted, emerging from corolla via its dorsal slit; filament tube 15–16 mm, c. 4 times longer than the dorsal anthers, sparsely short-pubescent in lines; anther tube grey, c. 2.5 mm diam, its surface glabrous; dorsal anthers c. 4 mm long; ventral anthers c. 3 mm long, bearded at apex with white trichomes 1–1.5 mm long. Capsule and seeds not seen.

Distribution — Endemic to Sibuyan Island in the Philippines.

Habitat & Ecology — Open grassland and elfin forest on ultramafic soils atop a ridge crest on Mt Guiting Guiting at c. 1400 m. Flowering: May through August.

Icon . Argent et al. (2007) f. 2.