老挝棋子豆 lao wo qi zi dou

Pithecellobium laoticum Gagnepain, Bull. Soc. Bot. France 99: 48. 1952; Cylindrokelupha laotica (Gagnepain) C. Chen & H. Sun.

Trees, ca. 10 m tall. Branchlets brownish, terete, glabrous. Leaf petiole 3-4.5 cm; petiolar glands at apex and insertion of first leaf pair, more than 1 mm high, 1.5-3 mm in diam., hollow inside; pinnae 1 pair; pinna rachis 5-12 cm; petiolules ca. 3 mm; leaflets 3 pairs, opposite, sublanceolate or oblanceolate, 6-10 × 2-3 cm, terminal one largest, firmly papery, lateral veins 5-9 pairs, glabrous on both surfaces, base attenuate, apex mucronate, slightly unequally sided. Heads ca. 20-flowered, ca. 2 cm in diam. (including filaments), 1 or 2 axillary or arranged in panicles; peduncles 1.5-2 cm. Calyx campanulate, 2-3 mm; teeth deltoid. Corolla 4.5-5.5 mm; lobes lanceolate, ca. 3 mm, margin and apex golden pubescent. Stamens ca. 1 cm, staminal tube equaling corolla tube. Ovary stipitate, glabrous. Legume and seeds unknown. Fl. Mar.

Margins of dense forests; 500-700 m. Yunnan [Laos, Vietnam].

The Chinese record of Archidendron dalatense (Kostermans) I. C. Nielsen (FRPS 39: 48. 1988, as Cylindrokelupha dalatensis (Koster­mans) T. L. Wu) is based on a misidentification of A. laoticum. See S. Hang and J. Chen (Acta Bot. Yunnan. 12: 121-122. 1990, as C. laotica).