Lasianthus latifolius (Blume ex DC.) Blume ex Miq. (1857: 320)

44. Lasianthus latifolius (Blume ex DC.) Blume ex Miq. (1857: 320) View in CoL — Fig. 70 View FIGURE 70 (plate), Fig. 67 View FIGURE 67 (map)

Type: — INDONESIA. Java, Blume s.n. ( lectotype L! [L0057522], designated by Zhu 2012) .

Mephitidia latifolia Blume ex DC. (1830: 453) . Type: — INDONESIA. Java, Blume s.n. ( lectotype L! [L0057522], designated by Zhu 2012).

Specimens examined: — VIETNAM. Central: Gia Lai Province, K’Bang District, Kon Chu Rang Nature Reserve , 1015 m elev., 20 April 2021, Dang V.S., Truong B.V. & Duong M.T.T.N., Dang 464 ( VNM) .

Distribution: —Southeast Asia region ( Cambodia, Indonesia). In Vietnam, Lasianthus latifolius occurs in Kon Chu Rang Nature Reserve of Gia Lai Province.

Habitat & Ecology: —This species was collected under the canopy of the evergreen forest at around 900–1100 m elev.

Phenology: —Fruiting from February to May, fruiting from June to October.

Vernacular name: —Xú hưƠng lá rộng.

Notes: — Lasianthus latifolius is a new record for the flora of Vietnam. This species is characterized by having elliptic-oblong leaves, secondary veins 6–7 on each side of midrib, flowers white, calyx lobes longer than the calyx tube, and fruits globose with 6 pyrenes. It is closely related to L. calycinus Dunn (1912: 367) which is endemic to China, but differs from the latter in having fewer secondary veins (6–7 on each side of midrib vs. 8–9 on each side of midrib), longer petioles ( 10–15 mm long vs. 8–10 mm long), smaller calyx (tube ca. 1.5 mm long, lobes ca. 2.5 mm long vs. tube 2–2.5 mm long, lobes 4–5 mm long) and larger corolla ( 8–12 mm long vs. 7–9 mm long).

Additional corolla morphology for L. latifolius : corolla cylindrical, 8–12 mm long, white, corolla tube 6–8 mm long, pubescent outside, corolla lobes 5, triangular-lanceolate, 2–4 mm long, pubescent outside, floccose inside, the throat hairy; stamens 5, filaments short, anthers oblong, 1–1.4 mm long; ovary with 5 locules, style linear, 7–8 mm long.