Research Article |
Corresponding author: Nguyen Van Ngoc ( mr.ngocnv@gmail.com ) Academic editor: Pavel Stoev
© 2016 Nguyen Van Ngoc, Shuichiro Tagane, Hoang Thi Binh, Hironori Toyama, Norikazu Okabe, Chinh Nguyen Duy, Tetsukazu Yahara.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Ngoc NV, Tagane S, Binh HT, Toyama H, Okabe N, Nguyen Duy C, Yahara T (2016) Popowia bachmaensis (Annonaceae), a new species from Bach Ma National Park, Central Vietnam. PhytoKeys 65: 125-131. https://doi.org/10.3897/phytokeys.65.8792
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A new species, Popowia bachmaensis Ngoc, Tagane & Yahara, sp. nov. is described from Bach Ma National Park in Thua Thien Hue Province, Central Vietnam. This species is morphologically similar to Popowia pisocarpa (Blume) Endl. ex Walp., but can be readily distinguished from it by its lower stems, smaller leaves, shorter flowering pedicels, shorter carpels, longer sepals and inner petals. A detailed description, comprising illustrations, and supplemented with DNA barcodes of the two regions of rbcL and matK, are provided.
Annonaceae , Bach Ma National Park, new species, Popowia , Vietnam
Popowia Endlicher is a small genus of the family Annonaceae. It was firstly described in the Genera Plantarum secundum Ordines Naturales for the type species, Popowia pisocarpa (Blume) Endl. ex Walp (
The genus Popowia has been classified within tribe Mitrephoreae Hook. f. & Thomson with the genus Goniothalamus (Blume) Hook.f. & Thomson, Mitrephora Hook.f. & Thomson, Neouvaria Airy Shaw, Oxymitra Hook. f. & Thomson and Pseuduvaria Miq. (
In a recent taxonomic revision of Annonaceae in Vietnam,
Here, the second Vietnamese species of Popowia is reported, which was found in Bach Ma National Park, Phu Loc District, Thua Thien Hue Province. This national park was established in 1991 with a total area of 37,487 hectares and is recognized as a biodiversity hotspot because of its unique topography, high species richness and highly threatened biodiversity. The peak of Bach Ma Mt. is 1,450 m high and is covered by clouds almost throughout the year. The park preserves virgin forests, which depending on their altitudinal distribution can be classified as follows: seasonal evergreen forests, hill evergreen forests, and lower montane forests. So far 2,373 species of vascular plants, accounting for approximately 17% species of the total flora of Vietnam, have been recorded from the National Park (
During our botanical inventory of Bach Ma National Park in 2015, a new species of genus Popowia was discovered, P. bachmaensis Ngoc, Tagane & Yahara, sp. nov. Here, it is described, illustrated and the DNA barcodes are provided of the two plastid regions rbcL and matK (
The new species was recognized through literature review, examined specimens in the herbaria
Leaf pieces were dried using silica-gel in the field and DNA isolation was performed by the CTAB method (Doyle and Doyle 1987) with minor modifications described in
Similar to Popowia pisocarpa (Blume) Endl. ex Walp., but distinguished from that species by having small habits (30–60 cm tall vs. 3–7 m tall in P. pisocarpa), smaller leaves (4.6–10.8 cm × 2.0–5.6 cm vs. 5.5–14 cm × 2.5–7 cm in P. pisocarpa), longer petioles (ca. 1.8–3 mm vs. 2–5 mm long) shorter flowering pedicels (2–3.5 vs. 4–7 mm long), longer sepals (ca. 3 mm vs. 2 mm long), longer inner petals (6 mm vs. 3 mm long), shorter carpels (2.1 mm vs. 10 mm long) (The measurements of P. pisocarpa derive from
VIETNAM. Thua Thien Hue Province, Bach Ma National Park, in evergreen forest, 16°13'41.60"N, 107°51'09.35"E (DMS), alt. 485 m, 23 May 2015, with flowers and young fruits, Yahara T, Tagane S., Toyama H., Nguyen Ngoc, Nguyen Chinh, Okabe N. V2557 (holotype:
Shrubs, 30–60 cm tall. Young twigs hirtellous with yellowish brown hairs, glabrescent, blackish. Leaves alternate; petioles 1.8–3 mm long, hirtellous; blades elliptic, elliptic-obovate, obovate, (3.7–)4.6–10.8(–15) × 2.0–5.6 cm, length/width ratio 1.7–2.5(–3.2), base obtuse, usually asymmetric, apex acuminate, acumen up to 1.4 cm long, margin entire, ciliate, papery, dull greyish green to dull blackish brown adaxially, pale green, dull greyish green, or greyish brown abaxially, minutely granular, pubescent on both surfaces when young, glabrescent adaxially when old; midribs prominent abaxially, pubescent on both surfaces; secondary veins 7–11 pairs, arising at angle of 45–55 degrees from a midrib, prominent abaxially when dry, pubescent on both surfaces; tertiary veins faintly visible, scalariform-reticulate. Inflorescences extra-axillary or leave-opposed, fascicles of 1–3 flowers. Pedicels 2–3.5 mm long, hirtellous; bracts triangular, ca. 1 mm long, ca. 0.5 mm wide, brownish pubescent outside and margin, glabrous inside, bracteoles caducous. Sepals 3, broadly ovate, ca. 3 × 3 mm, pubescent outside, glabrous inside. Petals 6, white; outer petals ovate-triangular, ca. 2.7 × 1.5 mm, pubescent outside, glabrous inside; inner petals narrowly ovate-triangular, ca. 6 × 3.2 mm, pubescent on both surfaces except lower part of inside. Stamens 22 per flower, reverse truncated pyramid, ca. 1.1 × 0.8 mm, glabrous, the connective truncate, flat-topped or slightly concave, ca. 0.1–0.2 mm long; anthers ca. 0.7 mm long. Carpels 6 per flower, ca. 2.1 mm long; ovary ca. 1.1 mm long, glabrous; stigmas and pseudostyles reverse conical, ca. 1 × 0.7 mm. Immature fruiting pedicels ca. 3.5–4.0 mm long, pubescent with reddish brown hairs; monocarp three, globose, ca. 2.2 mm in diam., pubescent with short white hairs, hairs blackish brown when dried. Seeds one per monocarp, ca. 1.5 mm long, reddish brown, glabrous, furrowed when dried.
Vietnam (so far known only from its type locality).
Mature flowers and young fruits were collected in May.
The specific epithet ‘bachmaensis’ is derived from the type locality, Mt. Bach Ma, Vietnam.
Data Deficient (DD). During the botanical inventory carried out from 21 to 28 May 2015 from the foot to the top of Mt. Bach Ma, 15 individuals of Popowia bachmaensis were observed in all. They were found on the slopes of secondary hilly evergreen forest, at ca. 500 m elevation. Among them, only two individuals produced flowers, one produced fruits, and the others are just saplings. According to the population size observed, this species can be qualified as Critically Endangered (CR) (
The authors thank the staff of the Vietnam Administration of Forestry, Dalat University, and the Bach Ma National Park for arranging the necessary collecting permits, and for supporting our survey. We are grateful to the curators and staff of the herbaria