Lanonia batoensis Henderson & Nguyen Quoc Dung, 2017

Henderson, Andrew & Dung, Nguyen Quoc, 2017, New species of Lanonia, Licuala, and Pinanga (Arecaceae) from Vietnam, Phytotaxa 323 (2), pp. 159-172 : 159-160

publication ID	https://doi.org/10.11646/phytotaxa.323.2.4
DOI	https://doi.org/10.5281/zenodo.13696688
persistent identifier	https://treatment.plazi.org/id/03C38781-FF88-FFF2-FF77-6AB9FAD1FAB5
treatment provided by	Felipe
scientific name	Lanonia batoensis Henderson & Nguyen Quoc Dung
status	sp. nov.

Treatment

Lanonia batoensis Henderson & Nguyen Quoc Dung View in CoL sp. nov. ( Fig. 1 View FIGURE 1 ).

Type:— VIETNAM. Quang Ngai: Ba To District, road from Ba To to Ba Cung, 14°44’N, 108°53’E, ca. 600 m, 18 July 2012, A. Henderson, Nguyen Quoc Dung & Le Van Tuan 3818 ( holotype VFM!, isotype NY!).

It differs from other species in its inflorescences projecting above the leaves, tubular rachis bracts, and 10.0– 23.5 cm long, pendulous rachillae.

Stems solitary, 1.8 m tall, 3.0 cm diameter. Leaves 12; sheaths not recorded; ligules short, to 2 cm long; petioles 85.0 cm long, thorny along the margins for the ca. proximal one third; blades to 65.0 cm across, split into 19–20 approximately equally wide segments; costa 2.0 cm long; central segment split into 2 lobes, these 40.5–51.0 cm long, 1.3–1.4 cm wide at the apex; lateral segment not recorded; segments briefly indented at the apex. Inflorescences erect, projecting above the leaves, 115.0–130.0 cm long; staminate inflorescences branched to 3 orders; prophylls not recorded; peduncles not recorded; partial inflorescences 6, each subtended by a tubular rachis bract; rachillae to 23.5 cm long, minutely hairy; staminate flowers not seen; pistillate inflorescences branched to 2 orders; prophylls not recorded; peduncles with 4, narrow, tubular, glabrous peduncular bracts; partial inflorescence 1; rachillae 10.0–18.0 cm long, glabrous, pendulous; pistillate flowers not seen at anthesis, solitary; calyx 3-lobed above, each lobe splitting again as the fruits develop to give a 6-lobed calyx; corolla with 3 petals; fruits not recorded.

Distribution and habitat:—Central Vietnam in Quang Ngai province in lowland rainforest at 600 m elevation.

Taxonomic notes:— Lanonia batoensis appears most similar to a group of Lanonia species having numerous, more or less equally wide segments ( L. acaulis , L. centralis , L. poilanei ). It differs from these in its tubular ( versus flattened) rachis bracts and longer, pendulous rachillae.

Additional specimen examined. VIETNAM. Quang Ngai: Ba To District, road from Ba To to Ba Cung, 14°44’N, 108°53’E, ca. 600 m, 18 July 2012, Henderson, Nguyen Quoc Dung & Le Van Tuan 3819 (NY, VFM).