Kase
Masoala Madagascariensis • Hovotralanana • Mandanozezika
The Essence
"Masoala madagascariensis is one of only two species in the genus Masoala, both endemic to Madagascar. It is a solitary, squat but massive litter-trapping palm: 20-31 stiff leaves 3-4 m long are held in a shuttlecock crown that catches falling debris, and the palm sends aerial roots up into the trapped litter. Genera Palmarum separates the genus from the superficially similar Marojejya by its lax bisexual rather than congested unisexual inflorescences, and by its symmetrical fruit with apical stigmatic remains. It is also among the world's rarest palms. The IUCN assessment, dated 17 December 2010 and published in 2012, lists it as Critically Endangered under criteria C2a(i); D, with just 30 mature individuals in a severely fragmented, declining population recorded from six to eight locations. The threats recorded are shifting agriculture, gathering of terrestrial plants, and logging and wood harvesting; the species occurs in at least one protected area, and is protected in Marojejy, Masoala and Mananara Avaratra. Uses recorded by IUCN include thatch and handicrafts from the leaves, an edible palm heart, and fruits with edible nuts, alongside international trade in seed for horticulture. Among growers it is a prized collector's palm - Palmpedia quotes a grower calling it one of the "holy grail" palms - but a very slow one, apparently taking decades to form a trunk in cultivation. Documented specimens include plants at Floribunda Palms in Hawaii, in Thailand, and in the Gold Coast hinterland of Queensland, Australia."
The genus Masoala is named after the Masoala Peninsula in northeast Madagascar, where, according to Genera Palmarum, the palm was first collected and described. The epithet madagascariensis is botanical Latin for "of Madagascar". Both genus and species were described by the French botanist Henri Lucien Jumelle (author abbreviation Jum.), first published in Annales du Musee Colonial de Marseille, ser. 5, 1(1): 8 (1933). Palmpedia gives the phonetic rendering mah-soh-AH-lah mad-ah-gas-kahr-ee-EN-sis.
The type material was collected by Perrier (Perrier 11938) at Marambo, Antalaha, in October 1912 and is held at Paris (P). Although named in 1933, the palm remained effectively unknown as a living plant for a further half-century: until 1986 it was represented only by very incomplete material in the Paris Herbarium, which gave little indication of its appearance or relationships. Genera Palmarum could therefore place Masoala only in an uncertain position among the arecoid palms, until new material was collected as the book went to press. The 1995 monograph assessed the palm as Vulnerable, noting it was then known from only three recent sites, all with low numbers; IUCN likewise published a Vulnerable listing in 1998, before the 2010 assessment moved it to Critically Endangered.
Natural Habitat
A palm of very humid lowland rain forest in northeastern Madagascar. It grows on dry hillsides through to swampy valley bottoms, and occasionally on ultramafic soils. The Palms of Madagascar (1995) recorded it at 200-420 m; later survey work revised this to 50-700 m, the limits IUCN uses. The monograph knew it from Marojejy, Masoala and Mananara, from the Marojejy Massif south to the Bay of Antongil; later fieldwork extended the known distribution to eight discontinuous locations between Mahavelona and Marojejy, with IUCN recording 6-8 locations. IUCN classifies the system as terrestrial and the habitat as subtropical/tropical moist lowland forest, and reports continuing decline in its area, extent and quality. POWO records the species as a tree of the wet tropical biome.
Curated Specimens

Botanical specimen of Masoala Madagascariensis.

Botanical specimen of Masoala Madagascariensis.

Botanical specimen of Masoala Madagascariensis.

Botanical specimen of Masoala Madagascariensis.

Botanical specimen of Masoala Madagascariensis.
Biology & Morphology
"Solitary, unarmed, pleonanthic and monoecious, with a hard-wooded trunk 3.5-10 m tall (14-20 cm thick when clean, 30-35 cm while still clothed in sheath remnants), a shuttlecock crown of 20-31 stiff, marcescent, litter-accumulating leaves 3-4 m long with 55-70 bright green leaflets on each side of the rachis, interfoliar inflorescences 0.7-1.3 m long branching to two orders with triads borne in pits, and subglobose fruit 24-25 x 18-19 mm that ripen yellowish brown and carry a pronounced terminal stigmatic boss over a thick fibrous endocarp. Genera Palmarum records a chromosome number of 2n = 32 for the genus."
Morphology
Symmetrical columnar trunk with characteristic leaf-scar patterning and lignified outer cortex.
Adventitious root system spreading radially to maximize hydraulic intake in competitive soil matrices.
Distinctive unknown habit and medium stature providing a unique architectural profile.
Foliage
Vibrant green canopy featuring characteristic frond architecture optimized for photon interception and transpiration efficiency.
Specialized green tissues exhibiting moderate metabolic expansion rates.
Reproduction
Complex inflorescence branching typical of the Masoala clade, exhibiting seasonal reproductive synchrony.
Nutrient-dense drupes encased in a fibrous pericarp, optimized for protection and dispersal.
Dormant embryonic tissues with high endosperm density, characteristic of resilient Masoala specimens.
Ecology
Active rhizosphere communication with mycorrhizal fungal networks, enhancing phosphorus and micronutrient uptake.
Interlocked with local entomological vectors, primarily Meliponini bees or specialized coleoptera.
Gravity-mediated and animal-vectored dispersal mechanisms ensuring regional genetic distribution.
Germination & Propagation
Germination Timeline
Hydration soak.
Incubation in moist media.
Sprout emergence.
Germination is adjacent-ligular and the first seedling leaf (eophyll) is bifid. The seed is enclosed in a thick, fibrous endocarp that adheres to it as a hard layer. Rare Palm Seeds rates germination 2 out of 5 on its difficult-to-easy scale, i.e. toward the difficult end. Palmpedia quotes a grower reporting that the palm is so slow in cultivation that its potential is hard to judge, apparently taking decades to form a trunk.
Cultivation & Care
Light
Rare Palm Seeds gives light shade in all climates, including dry, hot ones, and deep shade for young plants. This is consistent with its origin in humid lowland rain forest.
Water
High. Rare Palm Seeds lists its water requirement as high, and Palmpedia recommends warm, sheltered and moist conditions. In habitat the palm occupies the most humid forest, including swampy valley bottoms.
Soil
No cultivation-specific soil recommendation was found in the sources consulted. In habitat it tolerates a wide moisture range, from dry hillsides to swampy valley bottoms, and occasionally grows on ultramafic soils. It is a litter-trapping palm: leaf litter accumulates in the leaf bases and the palm sends aerial roots up into the trapped material.
No USDA zone rating was found in any authoritative source. Rare Palm Seeds lists frost tolerance as none and wind tolerance as low, and describes it as a palm for the humid tropics; Palmpedia advises warm, sheltered and moist conditions. Treat it as strictly tropical and frost-intolerant.
Pests, Diseases & Care
Pests
Brassolis sophorae (Coconut Caterpillar)
MODERATEDefoliation of pinnate leaflets, reducing photosynthetic capacity.
Manual removal and application of Bacillus thuringiensis (Bt).
Coraliomela brunnea (Leaf Miner)
LOWNecrotic galleries in young leaves, particularly in spiny species.
Targeted contact insecticides during peak emergence.
Diseases
Colletotrichum spp. (Anthracnose)
MODERATEBlack necrotic spots on leaflets under high humidity.
Copper-based fungicides and reduction of overhead irrigation.
Ganoderma zonatum (Butt Rot)
LETHALRadial wood decay and structural instability at the base.
No chemical cure; immediate isolation and removal.
Nutritional Deficiencies
Interveinal chlorosis (Younger fronds)
Chelated Fe-EDDHA Soil Pulse
Marginal chlorosis (Older fronds)
Mg-Sulfate (Kieserite) saturation
Frizzletop / Distorted spear
Systemic Mn-Sulfate application
Care Tips
Biosurveillance pulse synchronized for Madagascar regional vectors.
Apply prophylactic fungicidal drench in the nocturnal phase.
Improve canopy ventilation to disrupt fungal sporulation cycles.
Sources & Conservation
Curated- Masoala madagascariensis Jum. | Plants of the World Online | Kew Science (POWO) · accessed 2026-08
- Masoala madagascariensis. The IUCN Red List of Threatened Species 2012: e.T38608A2880970 (Rakotoarinivo & Dransfield) · accessed 2026-08
- Masoala madagascariensis Jum. | PALMweb (full description from Dransfield & Beentje 1995, The Palms of Madagascar, RBG Kew / IPS) · accessed 2026-08
- Masoala Jum. (genus) | PALMweb - etymology, diagnosis and description from Genera Palmarum (Dransfield et al. 2008, RBG Kew) · accessed 2026-08
- Masoala madagascariensis - Palmpedia, Palm Grower's Guide · accessed 2026-08
- Masoala madagascariensis - Rare Palm Seeds (description and cultural requirements) · accessed 2026-08
- Masoala madagascariensis - Wikipedia · accessed 2026-08
- Masoala (palm genus) - Wikipedia · accessed 2026-08
- GBIF Backbone Taxonomy - Masoala madagascariensis Jum. (taxon key 5293757) · accessed 2026-08