Lasianthus constrictus Wight (1846:515)

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 : 12-13

12. Lasianthus constrictus Wight (1846:515) . Type: ― MYANMAR. Mergui, presented in 1871, W. Griffith s.n. (holotype K000031672!).

= Lasianthus constrictus Wight var. latifolius Craib (1934:209) . Type: ― THAILAND. Pattani: Khao Kala Kiri (current name, San Kala

Khiri), 15 April 1928, A. F. G. Kerr 14940 (holotype K000777033!; isotype BK257385!, K000777034!). ( Figure 3F ).

T hailand: —SOUTH-EASTERN. Chonburi: Koh Chang, 2 August 1973, G. Murata, N. Fukuoka & C. Phengklai T-17451 (AAU, BKF). Chanthaburi: Khao Khitchakood National Park, 8 February 1987, C. Niyomdham, R. Kubat & M. Fuchs 1318 (AAU, BKF). PENINSULAR. Songkhla: Khao Nam Khang National Park, 28 August 1995, K. Larsen et al. 46089 (AAU, BKF, PSU). Narathiwat: Ban Bala south of Waeng district, 16 August 1995, K. Larsen & S. S. Larsen 32762 (AAU, BKF,K), 2 March 1974, K. Larsen & S. S. Larsen 32851 (AAU, BKF, K). Ranong: Kapoe district, Khlong Na Kha Wildlife Sanctuary, C. Puff & K. Sridith 930707-1/4 (AAU, BKF, PSU, WU).

Distribution: — Burma, Singapore, Malaysia ( Sarawak, Sabah), Brunei, Indonesia (Sumatra, Java, Kalimantan), Thailand (South-Eastern, Peninsular).

Ecology: —Evergreen forest, in shaded places at an elevation of 300‒ 600 m. Fruiting in October‒November.

Notes: ―Herbarium specimens of Lasianthus constrictus are superficially similar to L. reticulatus Blume (1827:1000) but differ by having small leaves 7‒14 × 3‒5 cm, (3‒) 4 (‒5) pairs of lateral veins, calyx limb truncate or minutely toothed, fresh fruits 1.5‒2 cm diameter, drupes with 2‒4 pyrenes, 0.8‒1 cm diameter when dry, immature and mature fresh fruits with blue color. In contrast L. reticulatus has large leaves 20‒26 × 6‒9 cm, 5‒7 pairs of lateral veins, calyx campanulate, fresh fruits 0.8‒1 cm diameter, drupes with 1‒4 pyrenes, drupes 0.5‒0.8 cm when dried, immature fresh fruits green and blue when ripe. Lasianthus constrictus is also closely related to L. rabilii Craib (1933:24) from which it differs by having blue fresh fruits, drupes globose with base rounded and 0.8‒1 cm diameter, while L. rabilii has black fresh fruits and drupes that are globose with the base narrowed and 6‒7 mm diameter.

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.