Apoballis rupestris (Zoll. & Moritzi) S.Y.Wong & P.C.Boyce

• Genus: Apoballis
• Botanical Background: First described in 1854 by Zollinger & Moritzi as Schismatoglottis rupestris, the species was transferred to Apoballis by Wong & Boyce in 2010.

• Geographical Range: Occurs naturally from western Sumatra through the Lesser Sunda archipelago.
• Environment: Thrives under shaded canopy in humid tropical forests, in humus‑rich, well‑draining soil. Prefers stable moisture, high humidity (≥ 70 %), and warm temperatures (18 – 30 °C).

Leaves

• Glossy, ovate to sagittate blades up to 30 cm long
• Slender petioles arising from a creeping rhizome 
• Texture thin and somewhat parchment‑like

Inflorescence (Spadix & Spathe)

• Greenish‑white spathe encloses a central spadix bearing separate male and female flowers
• Blooming period infrequently observed but follows typical Araceae anthesis

Growth Habit

• Forms tight colonies via underground rhizomes
• Plants are low‑growing (10–20 cm tall) and spread laterally

Light Requirements

• Bright, indirect light; avoid direct sun

Watering & Humidity

• Keep soil evenly moist
• Maintain high humidity

Soil & Potting Mix

• Rich, loose mix of peat, compost, perlite and orchid bark

Temperature & Fertilizer

• Maintain 18 – 30 °C
• Feed monthly with balanced liquid fertilizer during growth

Division and Cuttings

• Divide rhizomes ensuring each segment has at least one growth bud

Seeds

• Rarely available; germination requires warm, moist shade

Typical Issues

• Spider mites, mealybugs and scale
• Avoid waterlogging to prevent root rot

Treatment Recommendations

• Apply insecticidal soap or neem oil
• Improve airflow and drainage

• “Rupestris” indicates a rock‑dwelling habit
• Echinate (spiny) texture contrasts with smooth pollen in related genera

• Prized for its compact, colony‑forming habit and rock garden interest

Wild Population Status

• Not formally assessed by IUCN; habitat loss in Sumatra and Lesser Sunda Islands may pose threats

Market Availability

• Rare in general trade; occasionally offered by specialist aroid nurseries