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| Argostemma bachmaense T.V.Do in Do, Zhe & Yang, 2020. DOI: 10.1111/njb.02765 |
Abstract
Argostemma bachmaense, a new species from central Vietnam, is described and illustrated here. The new species is most similar to A. laoticum and A. vietnamicum but can be distinguished from the latter two by having a well‐developed internode with leaf pairs separately arranged along stem, isophyllous or slightly anisophyllous leaves, an oblanceolate to spatulate lamina with attenuate base and lateral veins with 4–5 pairs prominent on abaxially, a terminal, solitary flower, an absent bract, narrowly ovate or broadly lanceolate, 8.5–10.5 × 2.8–4.2 mm petals, 6.5–7.5 mm long stamen with yellow anther, a 8.5–9.5 mm long, exerted style and a globose stigma. Information on ecology, phenology and preliminary conservation assessment of the proposed new species are provided. In addition, we also provide an identification key to the nine Argostemma species found in Vietnam.
Keywords: Argostemma, new species, Rubiaceae, Vietnam
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| Figure 2: (A–J) Argostemma bachmaense sp. nov. (A) habitat, (B) branch bearing a terminal, solitary flower without bracts, (C–E) oblanceolate to spatulate lamina with sparsely trichome on both leaf surfaces, (F) front view of open flower showing petals and stamen shape, (G) lateral view of open flower showing petals and stamen shape, (H) dorsal view of open flower showing petals and sepals shape, (I) shape of anther cone and style, (J) close up of an exserted style and globose stigma. (K–L) view of open flower and leaf shape of A. vietnamicum. (I) view of open flower and leaf shape of A. laoticum. (A–J) photographed by Niu Yang, (K–L) photographed by Bui Hong Quang and (M) photographed by Pranom Chantaranothai. |
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| Argostemma bachmaense sp. nov. (A) habitat, (B) branch bearing a terminal, solitary flower without bracts, (C–E) oblanceolate to spatulate lamina with sparsely trichome on both leaf surfaces, (F) front view of open flower showing petals and stamen shape, (G) lateral view of open flower showing petals and stamen shape, (H) dorsal view of open flower showing petals and sepals shape, (I) shape of anther cone and style, (J) close up of an exserted style and globose stigma. photographed by Niu Yang. |
Argostemma bachmaense T.V.Do, sp. nov.
Etymology: The specific epithet refers to the name of the type locality, Bach Ma National Park, Thua Thien Hue province, central Vietnam where the new species was found.
Truong Van Do, Chen Zhe and Niu Yang. 2020. Argostemma bachmaense (Rubiaceae, Rubioideae, Argostemmateae), A New Species from central Vietnam. Nordic Journal of Botany. DOI: 10.1111/njb.02765
