Plant of the month December,2021
Eng (thai)

 

 

Argyreia pseudosolanum Traiperm & Suddee, PhytoKeys 149: 110. 2020.
Convolvulaceae

Description: Climbers, densely silky hairs on lower surface of leaves, petioles, peduncle, bracts, pedicels, sepals and petals outside on mid-petaline bands and tube. Leaves elliptic to lanceolate, 7–17 cm long; base cuneate to obtuse or rounded; apex acute, apiculate; leaf blade dark green above, paler below; margins entire; secondary veins 5–8 on either side; petioles 0.3–1.2 cm long, grooved above. Inflorescences axillary cymes, 3–5-flowered; peduncle 4–6 mm long; bracts lanceolate, 5–7 mm long, caducous; pedicels 4–5 mm long. Flowers: sepals obovate with rounded apex; 2 outer obovate, 7.5–8 mm long, third sepal asymmetrical; 2 inner obovate, 5–6 mm long. Corolla rotate, 5-lobed, 1.8–2 cm long, white; tube short; limb distinctly star-shaped, ca 3 cm in diam. Stamens 5, exserted, subequal, 18–24 mm long; filaments basally fused to corolla tube, with a few multicellular uniseriate hairs at attachment point; anthers oblong-sagittate, 3–4 mm long, longitudinally dehiscent; pollen globose, finely spiny. Disc annular, undulate. Style slightly longer than stamens; stigmas 2, subglobose. Fruit a berry, subglobose, enclosed by enlarged calyx, 0.8–1 cm in diam. Seeds 2.

 

Distribution: Endemic to Northeastern Thailand, only known from Phu Langa National Park, Bueng Kan Province, on sandstone in dry evergreen forest, ca 500 m.

Thai name: เครือเศวตภูลังกา (khruea sawate phulangka)

Photos: Withawat Kieobang (Bueng Kan)

References: 
Traiperm, P. & Suddee, S. (2020). A new species of Argyreia (Convolvulaceae) from Thailand. Phytokey 149: 109-115.