Cyrtandra roseiflora H.J.Atkins

Atkins, H. J. & Kartonegoro, A., 2021, A TAXONOMIC REVISION OF CYRTANDRA (GESNERIACEAE) IN SULAWESI, INDONESIA, Edinburgh Journal of Botany 78 (364), pp. 1-122 : 96-98

31. Cyrtandra roseiflora H.J.Atkins , Edinburgh J. Bot. 60(3): 318 (2004).

– Type: Indonesia, Sulawesi, Central Sulawesi, Mt Sojol , 26 ii 2000, Mendum et al. 00173 (holotype BO; isotypes E, L). Figure 49 .

Shrub to 1 m in height. Stems slender, striate, subglabrous. Leaves opposite, subequal or one in each pair markedly reduced; petiole 3–4 mm long, subglabrous; blades of developed leaves 6–11 × 1.5–3 cm, narrow oblong to narrow elliptic, base acute and more or less symmetrical at base, not decurrent, margin serrate, apex acuminate; 5–7 pairs of lateral veins, occasionally looping and joining with vein above and with short veins running to the teeth, glabrous above and below. Reduced leaves c.4 × 2 mm, cordate. Inflorescences axillary and at the base of stems in axils of fallen leaves, 1- or 2-flowered, sessile; pedicel 5–7 mm long, sparsely hairy; bracts 2–4 mm long, linear, sparsely hairy, not connate. Calyx narrow campanulate, light green to brown, 12–14 mm long, slightly bilabiate, lobes subulate, upper lobes c. 6 mm long, lower lobes c. 7 mm long, sparsely hairy. Corolla pale red outside, paler internally, in tube and throat, 30–35 mm long, narrow funnel-shaped, gradually widening to mouth, slightly pouched on lower side, arcuate, lobes rounded, not recurved, c.7 × 7 mm, hairy externally, subglabrous internally. Stamens with filaments 3–5 mm long, attached 20–22 mm from base of corolla, glabrous; anthers 2 mm long, cohering at apices and face to face before dehiscence; staminodes 2, less than 1 mm long. Gynoecium 11–22 mm long; disc cupular, with undulate, fringed margin, 2–2.5 mm long; ovary and style eglandular hairy; stigma bilobed, lobes 1 mm, pressed together. Fruits ovoid, c.5 × 3 mm (immature?), sparsely hairy, calyx and base of style persistent.

Distribution. Central and South Sulawesi (see Figure 51 ).

Habitat and ecology. Montane forest at an altitude of 1500–1800 m.

Etymology. This species is named for its pale red flowers ( Atkins, 2004).

Proposed IUCN conservation category. Cyrtandra roseiflora is known from only two locations, so it has not been possible to calculate an EOO, but it has an AOO of 8 km 2, based on a 2 × 2 km grid cell size, under the B criteria ( Bachman et al., 2011). The type collection is from Mount Sojol Nature Reserve in Central Sulawesi, which has protected status (UNEP-WCMC & IUCN, 2019), and the second is from Mount Sesean, which has no formal protection. They are both from montane forest at altitudes of 1500 and 1800 m, which is less threatened than lowland areas, with 70% of forest at this altitude in ‘Great to Good’ condition ( Cannon et al., 2007). It is suggested that this species is considered Least Concern (LC).

Additional specimen examined. INDONESIA. South Sulawesi. North Toraja: Mt Sesean , 7 xi 2018, Ardi WI 345 ( KRB) .

Cyrtandra roseiflora can be distinguished from others in Sulawesi by its glabrous, serrate leaves, and pale red flowers with white throat. The specimen Rachmat 1002a (BO), cited under the original description, is part of a mixed collection with some sheets containing a different species. To avoid later confusion, this specimen has not been included in the list of additional collections here.

Figures

Figure 49. Cyrtandra roseiflora. a, Habit; b, opened corolla, showing position of stamens and staminodes; c, opened calyx, showing inner surface; d, gynoecium including disc. Drawn by Christina Oliver from Mendum et al. 00173. Reproduced from Atkins (2004) with the permission of the Trustees of the Royal Botanic Garden Edinburgh.

Figure 51. Distribution of Cyrtandra rantemarioensis (black triangles), C. roseiflora (white circles) and C. rubribracteata (red circles).