Lasianthus chrysoneurus (Korthals) Miquel (1857:322)

Napiroon, Tiwtawat, Chayamarit, Kongkanda, Dawson, Sally, Till, Walter & Balslev, Henrik, 2020, A synopsis of Lasianthus (Lasiantheae, Rubiaceae) in Thailand and two additional new species, Phytotaxa 439 (1), pp. 1-38 : 11-12

9. Lasianthus chrysoneurus (Korthals) Miquel (1857:322) .— Mephitidia chrysoneura Korthals (1851:222) . Type: —

INDONESIA. Java, P. W. Korthals 222 (lost, neotype designated by Zhu 2002):― INDONESIA. Java, Jawa Barat,

1917, C. A. Backer 22515 (Neotype L0306249 image!). ( Figure 3E ).

= Lasianthus glabrescens Miquel (1857:317) . Type: ― INDONESIA. Java, Zollinger 621 (holotype L0310703 image!; isotype K000763993!).

= Lasianthus kurzii Hook.f. (1880:183) . Type: ― MYANMAR. Chopedang, 1827, Wall. Cat. 8310 (holotype K000031671!).

= Lasianthus hoaensis Pierre ex Pitard var. microphyllus Pitard (1924:383) . Type (lectotype designated here): — CAMBODIA. Mont. de l’Elephant, 6 August 1919, M. Poilane s.n. (lectotype P02285244!; isolectotype P02285245!, P02285246!).

T hailand: —NORTHERN. Chiang Mai: Doi Inthanon National Park, 25 July 1987, J. F. Maxwell 87-720 (BKF, CMUB). NORTH-EASTERN. Loei: 29 December 1971, C. F. Van Beusekom et al. 4563 (BKF, K), 24 November 1958, T. Smitinand 4953 (BKF), Phrao district, 8 June 1997, W. Nanakorn & S. Watthana 9166 (BKF, QBG). EASTERN. Chaiyaphum: Phu Khieo Wildlife Sanctuary, October 1999, C. Phengklai 12276 (BKF), 16 December 1971, C. Phengklai 4360 (BKF), 20 September 1984, N. Fukuoka T36217 (BKF). Nakhon Ratchasima: Khao Yai National Park, 18 July 1973, G. Murata, N. Fukuoka & C. Phengklai 16248 (BKF), 22 October 1971, C. F. Van Beusekom & R. Geesink 3272 (BKF). SOUTH-EASTERN. Prachinburi: Khao Yai National Park, July 1966, K. Larsen, T. Smitinand & E. Warncke 198 (AAU, BKF, K). Chanthaburi: Pong Nam Ron, 13 July 2008, P. Phonsena, D. Chusithong & W. Chausook 6106 (BKF). Trat: Ban Saphan Hin, 4 August 1973, G. Murata, N. Fukuoka & C. Phengklai 17596 (BKF), 3 May 1974, R. Geesink, T. Hattink & C. Phengklai 6494 (BKF, K). PENINSULAR. Ranong: Klong Naka Wildlife Sanctuary, 7 September 1984, N. Fukuoka, T. Santisuk & W. Na Nakhon T35954 (BKF), 22 June 1974, R. Geesink, T. Hattink & C. Phengklai 7374 (BKF, K). Krabi: Khao Phanom Bencha National Park, 11 July 1992, K. Larsen, S. S. Larsen, C. Niyomdham, P. Sirirugsa, D. D. Tirvengadum, C. T. Norgaard 4331 (AAU, BKF).

Distribution: — India, Myanmar, China (Yunnan), Vietnam, Laos, Cambodia, Indonesia (Java), and Papua New Guinea, Thailand (Northern, North-Eastern, Eastern, South-Eastern, Peninsular).

Ecology: —Evergreen forest, in shaded places at an elevation of 50‒ 900 m. Flowering and fruiting in JulyAugust.

Notes: ―The morphological characters of the specimens cited above match Korthals’ description of L. chrysoneurus . Some specimens identified as L. kurzii Hook. f. (1880:183) in a previous revision of Thai Lasianthus ( Zhu 2001) are here referred to L. chrysoneurus . Zhu et al. (2012) noted that the type of L. chrysoneurus mentioned in the protologue ( Korthals 1851) should be found in L. Miquel (1857) had indicated that when making his combination. The type in the L herbarium had disappeared so Zhu et al. (2012) neotypified L. chrysoneurus with the collection C. A. Backer 22515 (L).

Lasianthus chrysoneurus is close to L. obscurus (Blume ex Candolle) Miquel (1857:317) from which it differs in indument characters; Lasianthus chrysoneurus has appressed pubescent branches, branchlets, abaxial leaf surface, stipules, bracts, and calyx, whereas L. obscurus is appressed pubescent on those organs especially on the fresh fruit surface of living plants which can easily be observed in the field. From our field survey it appears that L. chrysoneurus can be found more easily than L. obscurus in natural forests and protected areas.

Figures

FIGURE 3A‒O. Lasianthus werefound in Thai naturalforests:A) L. appressus;B) &C) L.attenuatus;D) L.chinensis;E) L.chrysoneurus; F) L. constrictus; G) L. cyanocarpus; H) L. ellipsoideus; I) L. ellipticus; J) L. fordii; K) L. foxworthyanus; L) & M) L. hirsutus; N) L. hispidulus and O) L. inodorus.