Kilauea pritchardia
Pritchardia Beccariana • Beccari's fan palm • Beccari's loulu • Loulu • Hāwane • Wāhane
The Essence
"Pritchardia beccariana is one of the tallest members of its genus, a solitary Hawaiian fan palm restricted to the island of Hawaiʻi, on the northeastern and eastern slopes of Mauna Loa in the wet forests near Hilo. Joseph Rock found it in December 1914 by Glenwood near Kīlauea at about 3,500 ft and formally described it in 1916, honouring his friend and coworker Odoardo Beccari; he wrote to Beccari that it was "a beautiful palm of fine symmetry... a very distinct species and very different from any other Pritchardia known to me." Rock later sent Beccari material collected at 4,200 ft on land opposite the residence of Walter M. Giffard, who helped collect it, and urged him to describe it as a new species; Beccari judged the smaller habit, leaves, stalks and fruits to be effects of the higher elevation and instead erected the variety giffardiana, today treated as a synonym. Mature trees rise far above a canopy of ʻōhiʻa and tree ferns in the ʻŌlaʻa forest of Hawaiʻi Volcanoes National Park, where they can be seen from Wright Road (Highway 148); it is one of five loulu species native to Hawaiʻi Island. The species is listed as Endangered on the IUCN Red List, with NatureServe rating it Critically Imperiled. Habitat loss, weed invasion, insects and the destruction of seedlings by rats and pigs are the main threats. Palmpedia notes that within uncleared forest outside the park it is "not considered rare," but that the barriers to reproduction warrant close observation. In cultivation it is rare, though often available from palm specialty nurseries; Palms For California rates it poorly suited to high-wind sites, where the leaves shred progressively as the palm gains height, and warns that some petioles are sharp-edged. It bears a striking resemblance to the Fiji fan palm (Pritchardia pacifica) and to Thurston's fan palm (P. thurstonii)."
The genus Pritchardia honours William Thomas Pritchard (1829–1907), a British official and consul stationed in Fiji, adventurer and author of Polynesian Reminiscences (1866). The epithet beccariana commemorates the Italian botanist Odoardo Beccari (1843–1920), Rock's friend and coworker, perhaps best known for describing the titan arum in Sumatra in 1878. The Hawaiian name loulu means "umbrella," from the former use of the leaves as protection against rain or sun.
Early Hawaiians ate the immature fruits, called hāwane or wāhane, peeling them for the soft endosperm, which tastes like coconut meat. The leaves (lau hāwane) were used for thatching and made into fans, umbrellas, hats (pāpale) and baskets, and the trunks of taller loulu were fashioned into spears and used as construction material. Trunks were notched to allow climbing for immature fruit and fronds, and old notches remain visible on some trees today.
Natural Habitat
Montane wet forest between about 300 and 1,300 m (1,000–4,200 ft) on Mauna Loa, in areas receiving more than 2,500 mm (100 in) of rain a year; POWO records that it grows in the wet tropical biome. It occurs in the ʻŌlaʻa forest within Hawaiʻi Volcanoes National Park and in uncleared forest outside the park, with mature trees emerging above ʻōhiʻa (Metrosideros polymorpha) and tree ferns. It was historically present much lower, likely down to near sea level, before urbanization and farming destroyed the lowland forest.
Specimen Gallery Under Curation
Discovering authentic visual assets in the field...
Biology & Morphology
"A large solitary fan palm reaching about 20 m (65 ft) tall on a smooth greyish trunk 20–25 cm (8–10 in) thick, carrying a crown of some 25–30 nearly circular, almost flat leaves about 1.8 m wide and equally long on petioles of similar length, divided only one-fifth to one-quarter of their length into many stiff-tipped segments and incompletely covered beneath with scattered lepidia, with inflorescences of 2–4 panicles shorter than or equalling the petioles and large globose to ellipsoid fruits 40 x 30–40 mm ripening black."
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 Pritchardia 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 Pritchardia 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.
The seeds are large. All timing and treatment figures above come from a genus-level Pritchardia propagation protocol written for P. affinis, not from work on P. beccariana itself.
Cultivation & Care
Light
Tolerates shade or full sun, though it grows considerably faster in sun; Rare Palm Seeds advises light shade when young and in dry, hot climates, and Palmpedia notes that in the hottest climates it needs protection from the midday sun. In southern California it does fairly well in partial shade but is a slow plant.
Water
High. Requires constantly moist soil and must not suffer drought, consistent with a habitat receiving over 2,500 mm of rain a year; Palms For California rates drought tolerance low and dry-heat tolerance moderate.
Soil
Humus-rich, moist but very well-drained soil; somewhat adaptable.
Relatively cold hardy for a Pritchardia. Palms For California gives a minimum temperature of about 30 °F (-1 °C) with moderate cool tolerance; Rare Palm Seeds lists frost tolerance as light. Hawaiian Pritchardia are more tolerant of cooler temperatures than their South Pacific counterparts, which is why they are especially popular with growers in subtropical and Mediterranean-climate regions such as southern California, southern Europe and southern Australia. No specific USDA zone rating was found in the sources consulted.
Pests, Diseases & Care
Pests
Latana camara (Mealybug Vector)
MODERATESap-sucking leading to sooty mold and potential virus transmission.
Ant control and application of horticultural oils.
Strategus aloeus (Ox Beetle)
HIGHAdults bore into the base of young palms, causing structural instability.
Soil drenching and manual inspection of the root flare.
Diseases
Colletotrichum spp. (Anthracnose)
MODERATEBlack necrotic spots on leaflets under high humidity.
Copper-based fungicides and reduction of overhead irrigation.
Phytophthora palmivora (Bud Rot)
CRITICALNecrosis of the spear leaf and decay of the meristem.
Fosetyl-Al application and optimizing canopy ventilation.
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 Global regional vectors.
Apply prophylactic fungicidal drench in the nocturnal phase.
Improve canopy ventilation to disrupt fungal sporulation cycles.
Sources & Conservation
Curated- Pritchardia beccariana Rock | Plants of the World Online | Kew Science · accessed 2026-08
- Pritchardia beccariana - Wikipedia · accessed 2026-08
- Pritchardia beccariana - Palmpedia - Palm Grower's Guide (includes Palmweb description) · accessed 2026-08
- Pritchardia beccariana - Palms For California (Geoff Stein) · accessed 2026-08
- Pritchardia beccariana Rock - The IUCN Red List of Threatened Species · accessed 2026-08
- GBIF Backbone Taxonomy - Pritchardia beccariana Rock (key 5294658, incl. vernacular names, distributions and IUCN Red List category) · accessed 2026-08
- Pritchardia beccariana - Beccari's Fan Palm - rarepalmseeds.com · accessed 2026-08
- Arecaceae (Pritchardia) propagation protocol - Reforestation, Nurseries and Genetics Resources (genus-level, written for P. affinis) · accessed 2026-08