Volume 15 > Part 1 > Year 2021 > Page 124 > Rubiaceae > Oldenlandia

3. Oldenlandia corymbosa L.wfo-0000254823

Sp. Pl.: 119. 1753; Hook.f., Fl. Brit. Ind. 3: 64. 1880; King & Gamble, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 72(2): 169. 1904; Pit. in Lecomte, Fl. Indo-Chine 3: 146. 1923; Ridl., Fl. Malay Penins. 2: 54. 1923; Craib, Fl. Siam. 2: 53. 1932; Bremek., Verh. Kon. Ned. Akad. Wetensch., Afd. Natuurk., Sect. 2, 48(2): 254. 1952; Verdc., Fl. Trop. E. Africa, Rub. (Part 1): 308. 1976.— Hedyotis corymbosa (L.) Lam., Tabl. Encycl. 1: 272. 1792; Fukuoka, S.E. Asian Stud. 8(3): 333. 1970; H.Keng, Concise Fl. Singapore 1, Gymn. Dicot.: 155. 1990; Tao Chen & C.M.Taylor in Z.Y.Wu et al., Fl. China 19: 160. 2011; R.J.Wang in K.M.Wong et al., Fl. Singapore 13: 118, fig. 30. 2019.— H. biflora var. corymbosa (L.) Kurz, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 46(2): 133. 1877.

Accepted Name : This is currently accepted.

Description : Annual herbs, erect or procumbent; stems 5–40 cm tall, quadrangular, 4-ribbed, slightly scabrid below nodes. Stipules sheath membranous, truncate to triangular, lobes as 2–3 filiform appendages, 2–3 colleters, yellowish brown. Leaves narrowly elliptic or narrowly oblong, 7–25 by 0.5–6 mm, apex acute, base acute, muricate near margin above, midrib slightly muricate beneath, lateral veins obscure; subsessile. Inflorescences axillary, dichotomous cymes, pseudo-umbellate, flowers 2–5 or solitary; peduncle 0.5–2 cm long. Flowers white, tubular; homostylous; pedicels 2–8 mm long, glabrous to slightly scabrid. Calyx lobes deltoid, 0.3–1 by up to 0.5 mm, margin muricate. Corolla tube 1–1.5 mm long, lobes ovate-deltoid, 0.8–1 by ca 0.5 mm, outside glabrous, inside with a row of hairs at mouth of corolla tube. Stamens inserted, adnate at middle of tube, filaments 0.5 mm long, glabrous; anthers ovate, 0.8–1 mm long. Ovary glabrous; style inserted, 0.5–1 mm long, glabrous; stigma reaching anther position, short, rounded. Capsules opening at top, oblate, 1.5–2.5 by 2–3 mm, not protruding above calyx. Seeds 25–40 per locule, angular, 0.2–0.3 by 0.1–0.2 mm, reticulate.

Thailand : NORTHERN: Mae Hong Son (Mae Sariang), Chiang Mai (Doi Suthep, Doi Inthanon, San Pa Tong), Chiang Rai (Doi Tung), Lamphun (Pa Sang), Lampang (Doi Khun Tan NP), Tak (Lan Sang NP, Doi Mu Soe), Phitsanulok (Thung Salaeng Luang NP); NORTH-EASTERN: Maha Sarakham (Kanthara Vichai); SOUTH-WESTERN: Phetchaburi (Huai Sai), Prachuap Khiri Khan; CENTRAL: Nakhon Pathom, Krung Thep Maha Nakhon (Bangkok); SOUTH-EASTERN: Chon Buri (Bang Saen, Khao Khiao), Rayong (Klaeng), Chanthaburi (Khao Soi Dao, Laem Sing); PENINSULAR: Ranong (Kho Khot Kra, Khao Ya): Phangnga (Luk Sua Cave, Kuraburi); Phuket (Nai Han Beach), Nakhon Si Thammarat (Khiri Wong, Lansaka), Trang (Thung Khai Botanic Garden), Narathiwat (Su-ngai Kolok).

Distribution : Tropics and subtropics of Africa and Asia, from W Africa to New Guinea, China, widely introduced in the Americas (type from the West Indies) and the Pacific region.

Ecology : Weed in open places, to 1,100 m alt. Flowering throughout the year.

Vernacular : Ya lin ngu (หญ้าลิ้นงู)(Bangkok).