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| Argyreia pseudosolanum Traiperm & Suddee
in Traiperm & Suddee, 2020.
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Abstract
Argyreia pseudosolanum Traiperm & Suddee, sp. nov. from the NE region of Thailand is described and illustrated. The new species is remarkable in having a very distinctive corolla shape similar to Solanum, and staminal filament bases glabrous or nearly glabrous with a few multicellular, uniseriate hairs at the attachment point on the corolla tube. Detailed descriptions, illustrations, a summary of the ecology and an IUCN conservation status are provided.
Keywords: filament morphology, new species discovery, Phu Langka, SE Asian biodiversity, staminal trichomes, taxonomy
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| Figure 1. Argyreia pseudosolanum. A Stem with leaves and inflorescences B adaxial leaf surface C abaxial leaf surface D upper part of leaf, showing secondary veins on adaxial leaf surface E inflorescence bracts, outer (left) to inner (right) F 5 sepals from outer (left) to innermost (right) G flower in front view H opened corolla with 5 stamens I pistil, showing undulate disc and biglobose stigma J filament insertion showing an attachment point K single stamen L close-up of lower part of stamen, showing a few multicellular uniseriate hairs M multicellular uniseriate hair N young fruits with sepals O fruit in longitudinal section, showing 2 immature seeds.
All drawn by N. Chitchak from voucher specimens Suddee et al. 5363 (BKF) (A–M), P. Kochaiphat 353 (BKF) (N, O).
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| Figure 2. Argyreia pseudosolanum inflorescence, corolla and young fruit details. A and C inflorescence and flower in lateral view, showing cymose inflorescence with short peduncle, and rotate corolla shape B flower in frontal view, showing 5-lobed corolla limb (star-shaped), exserted genitalia and pinkish anthers (voucher: Suddee et al. 5363) D young fruits (voucher: P. Kochaiphat 353).
Photographs A–C by W. Kiewbang, D by P. Kochaiphat.
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Argyreia pseudosolanum Traiperm & Suddee
Diagnosis: Similar to Argyreia corneri in having a white rotate corolla, but differs in narrowly elliptic, oblong or lanceolate leaf shape (versus ovate), the ovate outer sepal shape (versus broadly ovate), the limb distinctly star-shaped with 5-triangular lobes (versus limb vaguely 5-angled).
Distribution and ecology: In mixed deciduous forest on a sandstone plateau. Elevation: 530 m.
Etymology: The specific epithet refers to the corolla shape, which is similar to Solanaceae and not found elsewhere in Argyreia.
Vernacular name: Khruea sawate phulangka (เครือเศวตภูลังกา), the name is given by the authors.
Paweena Traiperm and Somran Suddee. 2020. A New Species of Argyreia (Convolvulaceae) from Thailand. PhytoKeys. 149: 109-115. DOI: 10.3897/phytokeys.149.50379
