Lasianthus venosus Blume

127. Lasianthus venosus Blume View in CoL

Lasianthus venosus Blume (1826 View in CoL –1827) 990; Miq. (1857) 323; (1869) 249; Bakh.f.(1965) 340. — Type: Blume s.n. (holo L, barcode L0000711 ), Java, Seriboe .

Lasianthus pterospermus Wight (1846) View in CoL 510; King & Gamble (1904) 125; Ridl. (1923a) 160; K.M. Wong (1989) 368, syn. nov. — Type: Kew Dist. 2929 ( Griffith s.n.) (holo K; iso HUH), Peninsular Malaysia.

Lasianthus singalensis Miq.(1869) View in CoL 247,syn. nov. — Type: Korthals s.n. (holo L, barcode L0057495 ; iso L, barcode L0057496 ), Sumatra, Mt Singalang .

Lasianthus chinensis sensu King & Gamble (1904) View in CoL 124,p.p.quoad specimen King’s collector 10100 (L).

Shrubs, up to 4 m high; branchlets terete, 2–2.5 mm diam, appressed-puberulous or glabrous, compressed in the youngest part and often dark-brown when dry. Leaves: blades oblong, elliptic-oblong or obovate-oblong, 12–16 by 3–4.5 cm, thinly coriaceous, glabrous above, appressed-pubescent hairs on midrib and nerves or glabrescent beneath, apex cuspidate-acute or cuspidate-acuminate, base cuneate to subrounded, more or less asymmetric, midrib and nerves flat above, prominent beneath, nerves 9 –12 pairs, ascending at an angle of over 60°, curved to the margin, nervules distinct above, distinct and prominent beneath, subparallel; petioles 2 – 3 mm long, pubescent. Stipules large, oblong-lanceolate to triangular oblong, 6– 8 or to 10 mm long, 3–4 mm broad, appressed-pubescent. Cymes sessile, bracts absent. Flowers sessile; calyx tube obconic, 1–1.5 mm long, sparsely pubescent, lobes 4–5, lanceolate to triangular, 1–1.5 mm long, hirsute both sides; corolla tubular, c. 6 mm long, glabrous and dark outside, lobes 4–5, ovate, c. 2 mm long. Drupes subglobose, 6 – 8 mm diam, glabrous, conspicuously and sharply 8 –10-ridged, crowned by hirsute calyx limbs; pyrenes 4–5, 2-winged on the abaxial face.

Distribution — Malaysia (Peninsular, Sarawak), Indonesia (Sumatra, Kalimantan).

Notes — Lasianthus venosus is characterized by triangular-oblong to oblong-lanceolate stipules up to 10 mm long, drupes sharply 8–10-ridged with 4–5 pyrenes, c. 8 mm diam, pyrenes with 2 wings (a longitudinal wing on each side of the convex of pyrene). Lasianthus pterospermus and L. singalensis are characterized just by the same characteristics as L. venosus . They are surely conspecific.

Miquel (1869) reduced L. rigidus to a synonym of L. venosus . However, the type of L. rigidus is quite different from the type of L. venosus and represent a different species.