Lasianthus vuquangensis V.S.Dang, Naiki & Yahara (2021:26)

Dang, Van-Son & Naiki, Akiyo, 2023, A revision of the genus Lasianthus Jack (Rubiaceae) from Vietnam, Phytotaxa 581 (1), pp. 1921-1935 : 1921-1935

publication ID

https://doi.org/10.11646/phytotaxa.581.1.1

persistent identifier

https://treatment.plazi.org/id/43284262-FF15-FF54-5AB6-FB7340C1C465

treatment provided by

Plazi

scientific name

Lasianthus vuquangensis V.S.Dang, Naiki & Yahara (2021:26)
status

 

73. Lasianthus vuquangensis V.S.Dang, Naiki & Yahara (2021:26) — Fig. 106 View FIGURE 106 (plate), Fig. 104 View FIGURE 104 (map) Type: — VIETNAM. Ha Tinh Province, Vu Quang National Park , 1130 m elev., 26 July 2015, Yahara T., Toyama H., Tagane S., Nguyen N.,

Yang C.J., Nguyen H. V3806 ( holotype VNM! [ VNM00042946 View Materials ]; isotypes DLU!, FU!, the herbarium of Iriomote Station ( Japan)) .

Specimens examined: — VIETNAM. Central: Ha Tinh Province, Vu Quang National Park, 1130 m elev., 18˚15’34.07”N, 105˚20’47.01’’E, in lower montane forest, 26 July 2015, Yahara T., Toyama H., Tagane S., Nguyen N., Yang C.J., Nguyen H. V3806 ( holotype VNM!; isotype DLU!, FU!, the herbarium of Iriomote Station (Japan)); in the same location, 1240 m elev., 18˚12’31.06”N, 105˚23’42.05’’E, in lower montane forest, 21 June 2016, Yahara T., Nguyen N., Toyama H., Tagane S., Okabe N., Nguyen H. V 5632 ( DLU, FU, the herbarium of Iriomote Station ( Japan)) .

Distribution: —Endemic to Vietnam (known only from the Vu Quang National Park, Ha Tinh Province).

Habitat & Ecology: —Evergreen forest, in shaded places at 1000–1240 m elev.

Phenology: —Flowering and fruiting from April to July.

Vernacular name: —Xú hưƠng vũ quang.

Notes: — Lasianthus vuquangensis is similar to L. rhinocerotis Blume (1826: 996) in the branches and branchlets densely brown-villous, the shape of leaves and calyx lobes 6, but differs from the latter in having smaller leaves (7–10 × 1.5–2.5 cm vs. 9–18 × 3–6.5 cm), fewer secondary veins (5–6 on each side of midrib vs. 9–12 on each side of midrib), bracts 1–2 mm long (vs. 6–15 mm long), smaller calyx lobes ( 1–2 mm long vs. 3 mm long), larger corolla tubes ( 6–8 mm long vs. 4 mm long) and fruits with 6 (vs. 5) pyrenes.

It is also similar to L. rhinocerotis subsp. pedunculatus (Pit.) H.Zhu (1998: 154) which is distributed in China and Vietnam, but differs from the latter in having smaller leaves (7–10 × 1.5–2.5 cm vs. 15–21 × 4–7 cm), fewer secondary veins (5–6 on each side of midrib vs. 9 on each side of midrib), bracts 1–2 mm long (vs. 6–12 mm long), smaller calyx lobes ( 1–2 mm long vs. 3 mm long), larger corolla tubes ( 6–8 mm long vs. 4 mm long) and fruits with 6 (vs. 4–5) pyrenes.

VNM

Institute of Tropical Biology

FU

Fudan University, Department of Biology

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