Volume 8 > Part 2 > Year 2007 > Page 372 > Euphorbiaceae > Macaranga

12. Macaranga kurzii (Kuntze) Pax & K.Hoffm.wfo-0000232050

in Engl., Pflanzenr. IV. 147. vii: 360. 1914; Airy Shaw, Kew Bull, 26: 290. 1972; Whitmore, Gard. Bull. Singapore 31: 55. 1978; Chiu, Guihaia 2: 148. 1982, in clavi; Gardner, Sidisunthom & Anusarnunthorn, Forest Trees N. Thailand: 313. 2000.— Tanarius kurzii Kuntze, Rev. Gen. Pl.: 619. 1891.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Shrub, treelet or small tree; twigs slender, ca 3 mm in diam., rounded, often with slightly knobbly leaf scars, pubescent, with scattered to dense long whitish pilose spreading hairs, sometimes very dense. Stipules elliptic, ca 4 mm long, tomentose, erect, very soon caducous. Leaves: petiole 3–13 cm long, very slender, sinuous, rounded, finely pubescent sometimes with a few long spreading white hairs, kneed; blade rhomboid-ovate, 6–18 by 3–8 cm, very rarely tricusped, papery, base usually very broadly cuneate, occasionally subtruncate, minutely cordate or under 1 mm peltate, several inconspicuous nectaries near petiole insertion, margin entire or scattered with tiny inconspicuous teeth, apex long caudate, venation with 3 basal nerves, below granular, subglabrous to velvety, scattered long white hairs, usually main nerves pubescent, sometimes all and sometimes with hairs arising from pustules on the lamina, above main nerves finely crisped pubescent and diffuse to fairly dense solitary hairs on lamina arising from pustules. Staminate inflorescences open, broad, diffuse racemes, 5–10 by 4–6 cm, branches 1–4 cm long, slender, thread-like; flower clusters evenly spaced, often contiguous; bracts opposite or subopposite, large and leafy; bracteoles inconspicuous, minute, ca 0.5 by 0.5 mm, apex blunt, smaller than flower cluster, soon caducous. Staminate flowers 2–4 per cluster, sessile; sepals free; stamens ca 17, 4-locular. Pistillate inflorescences 3.5–10 cm long with a cluster of 2 or 3 apical bracts; bracts deltoid, leafy, 15–30 by 6–10 mm, margin finely (deeply) regularly dentate, apex long caudate. Fruits solitary, 2-locular, strongly lobed, to 5 by 8 mm, with close dark granular glands and densely softly spiny; pedicel ca 10 mm long; calyx caducous; stigmas ca 10 mm long, thread-like.

Thailand : NORTHERN: Chiang Mai (Doi Suthep), Chiang Rai, Phitsanulok; NORTH EASTERN: Phetchabun, Loei; EASTERN: Chaiyaphum, Nakhon Ratchasima.

Distribution : China, Laos, Lower Burma (type).

Ecology : Locally abundant, patchy occurrence.

Notes: This species has a superficial resemblance to Macaranga trichocarpa. It is instantly recognisable by the long spreading white hairs, especially frequent on the inflorescence rachis.