e-Flora of Thailand

Volume 15 > Part 1 > Year 2021 > Page 74 > Rubiaceae > Involucrella

2. Involucrella coronaria (Kurz) Neupane & N.Wikstr.wfo-0001342536

Taxon 64: 317. 2015.— Scleromitrion coronarium Kurz, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 46(2): 136. 1877.— Hedyotis coronaria (Kurz) Craib, Fl. Siam. 2: 38. 1932; Fukuoka in S.E. Asian Stud. 8(3): 320, fig. 4. 1970. Fig. 10. Plate VI: A–B.


Accepted Name : This is currently accepted.



Synonyms & Citations :

Hedyotis connata Hook.f., Fl. Brit. India 3: 62. 1880, nom. illeg. superfl.; King & Gamble, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 72(2): 163. 1904; Ridl., J. Straits Branch Roy. Asiat. Soc. 59: 109. 1911.— Oldenlandia connata (Hook.f.) K.Schum. in Engler & Prantl, Nat. Pflanzenfam. 4(4): 25. 1891, nom. illeg. superfl.; Pit. in Lecomte, Fl. Indo-Chine 3: 110, fig. 12. 1922.— O. connata (Hook.f.) Kuntze, Revis. Gen. Pl. 1: 292. 1891, isonym.
Hedyotis coronata Wall. [Numer. List n. 856. 1829, nom. nud.] ex B.D.Jack., Index Kew. 1(2): 1101. 1893, nom. illeg.; Ridl., Fl. Malay Penins. 2: 48. 1923.
Oldenlandia coronata (Wall. ex Hook.f. & Jackson) Williams, Bull. Herb. Boiss. Sér. 2, 5: 950. 1905; Craib, Bull. Misc. Inf. Kew 1912: 101. 1912.
Hedyotis merguensis Hook.f. in Benth. & Hook.f., Gen. Pl. 2: 57. 1873, nom. inval.; Kurz, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 46(2): 136. 1877; Tao Chen & C.M.Taylor in Z.Y.Wu et al., Fl. China 19: 166. 2011.


Description : Herbs 15–40 cm tall; stems radially creeping, quadrangular, pubescent. Stipules 7–9 mm long, lobes ca 10, bristle-like, ciliate. Leaves oblong-elliptic, 2–10 by 0.5–3 cm, base acute, apex attenuate or mucronate, subcoriaceous, upper surface greyish brown, scabrous, lower surface puberulent, lateral veins 5–7 pairs; sessile. Inflorescence terminal, densely capitates; bracts ca 5 mm long, smaller at base, filiform, denticulate, scabrous. Flowers white or purplish white, heterostylous, stamens and style not exserted from corolla tube. Sepals 4–5; tube obconical, ca 2 mm long; lobes lanceolate, ca 3 mm long, glabrous. Petals 4–5; tube 7–12 mm long; lobes lanceolate, ca 3 mm long, glabrous. Stamens 4–5. Ovary 2-loculed, ovules numerous, glabrous. Longistylous flowers: filaments ca 0.3 mm long; anthers linear-oblong, 1.5–2 mm long; style filiform, 4–6 mm long, glabrous. Brevistylous flowers: filaments ca 0.5 mm long; anthers oblong, 1.5–2 mm long; style 2–3 mm long, glabrous. Capsules obscurely dehiscent, ovoid, 2–4 by 1.5–2 mm, glabrous; calyx persistent. Seeds ca 20 per locule, 0.4–0.5 mm long, angular.


Thailand : NORTHERN: Chiang Mai (Mae Pan Falls, Doi Inthanon, Doi Angka, Mae Klang Falls, Doi Suthep-Pui, Doi Chiang Dao), Chiang Rai (Doi Tung, Doi Pha Hom Pok, Phan, Doi Bang Mahan), Phayao (Doi Luang), Nan (Doi Phu Kha, Tham Sa Koen), Lampang (Doi Luang), Phitsanulok (Thung Salaeng Luang); NORTH-EASTERN: Phetchabun (Nam Nao NP), Loei (Phu Luang, Phu Suan Sai), Bueng Kan (Phu Wua, Bungkhla), Nakhon Phanom (Phu Langka, Ban Phaeng), Khon Kaen (Phu Pha Man); EASTERN: Chaiyaphum (Nam Phrom), Nakhon Ratchasima (Wang Nam Khiao); SOUTH-WESTERN: Kanchanaburi (Erawan, Sai Yok), Phetchaburi (Kaeng Krachan); SOUTH-EASTERN: Chon Buri, Rayong (Khao Chamao-Khao Wong NP), Chanthaburi (Khao Soi Dao); PENINSULAR: Ranong (Hot Spring), Phuket (Khao Phra Thao), Nakhon Si Thammarat (Khao Luang), Phatthalung (Khao Pu-Khao Ya), Trang (Khao Chong), Satun (Tarutao, Khuan Kalong), Narathiwat (Bacho).


Distribution : India (Assam), Myanmar (Tenasserim – type), Laos, Vietnam, Malaysia, Indonesia, the Philippines, China (Yunnan, Hainan).


Ecology : Evergreen, dry evergreen and dry deciduous forests, 0–1,150 m alt. Flowering: June–April.


Vernacular : Wang ot (วังอด)(Loei); ya ngoen (หญ้าเงิน)(Nakhon Si Thammarat).


Main

Figure 10
Plate 6: A–B
Involucrella coronaria (Kurz) Neupane & N.Wikstr.