Premna vietnamensis

 Premna vietnamensis Bo Li, PLoS ONE 13(5): e0195811 (5) (2018).

Premna vietnamensis Bo Li, Photo by Hoang Thanh Son

its native range is Vietnam.

Latin name:

Premna vietnamensis Bo Li

Family:

Lamiaceae Martinov

Synonyms:

No synonyms are recorded for this name.

Vietnamese name:

Vọng cách việt nam. 

Describtion:

Woody climbers, up to 5 m in length. Branchlets, petioles, leaf blades and inflorescences densely covered with long, spreading, golden-brown hairs. Branches grey, terete, sparsely dusty tomentose, with an interpetiolar ridge between petioles. Branchlets reddish brown, spreading, terete, without bracts at the base. Leaves simple, opposite, almost distichous, or slightly decussate, ovate-oblong to elliptic, rarely cordate-ovate, papery, (6.5–) 9.0–14 (–15.5) × 3.5–5.5 cm, apex acute, base cordate, margin serrate in the distal half of the leaf lamina; veins 4–6 pairs, abaxially raised and adaxially obviously compressed, secondary veins curved and jointed near margin; petiole short, 2.0–6.0 mm long, slightly inflated. Inflorescences terminal, a congested thyrse, subglobose to pyramid-shaped, 1.5–3.0 cm long, 2.0–2.5 cm wide, but infructescence elongated to 2.5–4.5 cm, peduncle 1.0–2.5 cm long; bracts lanceolate, ca. 1.0 mm long, easily deciduous; bracteoles subulate, tiny. Calyx campanulate, 2.0–3.0 mm long, green when young but purplish to brownish black when mature, obviously 2-lipped; upper lip emarginate to irregularly 2–3 lobed, covering a semi-globose fleshy appendage behind the lobes, lower lip 2 lobed, lobes slightly fleshy, apex rounded. Corolla greenish yellow, 2-lipped, 4.0–4.5 mm long; tube externally glabrous, internally densely white villose around throat; upper lip 1-lobed, upward reflexed, entire, oblong-obovate, apex rounded; lower lip 3-lobed, middle lobe oblong-obovate, straight or slightly recurved, lateral lobes rounded to obovate, strongly backward reflexed. Stamens 4, subequal, filaments yellowish to greenish white, glabrous, upward reflexed, slightly exserted; anther white. Ovary globose, 1.0–1.5 mm long, glabrous; style yellowish to greenish white, slender, upward reflexed. Fruits drupaceous, clavoid to nearly globose, 5.0–6.0 × 4.5–5.5 mm; exocarp membranous, green when young, from yellowish green, purplish green to bluish brown when mature, sarcocarp succulent, endocarp hard, warty; one pyrene with four seeds, only one fully develops.

Distribution: 

Vietnam (Gia Lai Province).

Ecological:

Plants reproduce by seeds. Usually grows on the banks of moist streams, where there is little light, outside the mouths of tropical evergreen forests in the wet season, at altitudes not exceeding 1,200m. 

Cultivation:

Flower and fruit season:

February to early March. 

Ecology:

The plant grows well along roadside and edges of primary evergreen broad-leaved forest at elevations around 600–650 m. a.s.l., and climbs up to 5 m on many kinds of shrubs. 

Chemical and Pharmacology:

Uses:

Typus:

Collector Team:

D.V.Hai & N.S.Khang HK 28042017-01

Locality:

Gia Lai Province, K'Bang District, Dong Commune, 650 m

Collection Date:

28 Apr 2017

Type Herbaria:

holotype IBSC

isotype HN

isotype IBSC

isotype JXau

Latitude:

14° 13' 4" N

Longitude:

108° 36' 28" E

Distribution Of Types:

Vietnam (Indo-China, Asia-Tropical)

References:

https://www.ipni.org/n/77177680-1

http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77177680-1

Hai DV, Min D-Z, Khang NS, Tan Y-H, Thoa PTK, Bramley GLC, et al. (2018) Premna vietnamensis (Lamiaceae, Premnoideae), a distinct new species from the Central Highlands of Vietnam. PLoS ONE 13(5): e0195811. https://doi.org/10.1371/journal.pone.0195811