Lasianthus lamdongensis V.S.Dang, Naiki

41. Lasianthus lamdongensis V.S.Dang, Naiki & Toyama (2021: 48)— Fig. 66 View FIGURE 66 (plate), Fig. 67 View FIGURE 67 (map)

Type: — VIETNAM. Lam Dong Province, Bidoup Nui Ba National Park , 1698 m elev., 24 February 2016, Tagane S., Nagamasu H., Naiki A., Dang V.S., Nguyen V.N., Wai J. V 4312 ( holotype VNM![ VNM00042913 View Materials ]; isotypes FU!, VNM! [ VNM00042914 View Materials , VNM00042915 View Materials ], the herbarium of Iriomote Station ( Japan)) .

Specimens examined: — VIETNAM. Central: Lam Dong Province, Bidoup Nui Ba National Park , 1698 m elev., 12°09’52.95’’N, 108°32’00.38’’E, in hill evergreen forests, 24 February 2016, Tagane S., Nagamasu H., Naiki A., Dang V.S., Nguyen GoogleMaps V.N., Wai J. V 4312 ( FU, VNM, the herbarium of Iriomote Station ( Japan)) .

Distribution: —Endemic to Vietnam (known only from the Bidoup Nui Ba National Park, Lam Dong Province).

Habitat & Ecology: —In hill evergreen forests at 1400–1700 m elev.

Phenology: —Flowering and fruiting from February to July.

Vernacular name: —Xú hưƠng lâm đồng.

Notes: — Lasianthus lamdongensis is similar to L. capitatus Blume (1827: 996) in the shape of leaves, linear bracts, and relatively small flowers, but differs from the latter in having smaller leaves (7–9 × 1.5–2.5 cm vs. 10–15 × 3–3.5 cm), more secondary veins (8–9 on each side of midrib vs. 7–8 on each side of midrib), shorter petioles ( 4–5 mm long vs. 5–8 mm long), smaller bracts ( 4–5 mm long vs. 5–10 mm long) and larger calyx tubes ( 2–3 mm long vs. 1–2 mm long).

It is also similar to L. camlamensis V.S.Dang & Naiki which was described from Hon Ba Nature Reserve in Khanh Hoa Province, but differs from the latter in having smaller leaves (7–9 × 1.5–2.5 cm vs. 9–12 × 2–4 cm), more secondary veins (8–9 on each side of midrib vs. 7–8 on each side of midrib), shorter petioles ( 4–5 mm long vs. 5–8 mm long), bracts 4–5 mm long (vs. inconspicuous), white (vs. orange) when ripe, and fruits with 6 (vs. 4) pyrenes.