A new generic system for the pantropical Caesalpinia group (Leguminosae) Author Gagnon, Edeline https://orcid.org/0000-0003-3212-9688 Institut de recherche en biologie vegetale and Departement de sciences biologiques, Universite de Montreal, H 1 X 2 B 2, Montreal, Quebec, Canada edeline.gagnon@gmail.com Author Bruneau, Anne Institut de recherche en biologie vegetale and Departement de sciences biologiques, Universite de Montreal, H 1 X 2 B 2, Montreal, Quebec, Canada Author Hughes, Colin E. Department of Systematic and Evolutionary Botany, University of Zuerich, 8008, Zuerich, Switzerland Author de Queiroz, Luciano Paganucci Universidade Estadual de Feira de Santana, BR 116, Km 03, Campus Universitario, Feira de Santana 44031 - 460, Bahia, Brasil Author Lewis, Gwilym P. Comparative Plant and Fungal Biology Department, Royal Botanic Gardens, Kew, Richmond, Surrey, TW 9 3 AB, United Kingdom text PhytoKeys 2016 2016-10-12 71 1 160 http://dx.doi.org/10.3897/phytokeys.71.9203 journal article http://dx.doi.org/10.3897/phytokeys.71.9203 1314-2003-71-1 FFA8FF9AFFEAFFDABA68757DFF9EFF8B 160340 14. Pterolobium R. Br. ex Wight & Arn., Prodr: 283. 1834 Figs 23 , 24A-C Cantuffa J.F. Gmel. (1791). Reichardia Roth (1821), nom. illeg., non Roth (1787), nec Roth (1800). Type . Pterolobium lacerans R. Br. ex Wight & Arn., nom. illeg. ( Cantuffa exosa J.F. Gmel. = Pterolobium exosum (J.F. Gmel.) E.G. Baker; this now considered a synonym of Pterolobium stellatum (Forssk.) Brenan). Description. Lianas or scrambling / trailing shrubs, armed with prickles on shoots, as well as in pairs at the base of leaves. Stipules small, inconspicuous, subulate or triangular-subulate, caducous. Leaves alternate, bipinnate, ending in a pair of pinnae, 6-30 cm long; petiole and rachis pubescent to sparsely pubescent or glabrous; pinnae opposite, in 5-20 pairs; leaflets opposite, in 6-25 pairs per pinna, linear-oblong to elliptic-oblong, apex rounded to emarginate, sometimes mucronate, eglandular or punctate-glandular, 6-15 x 1.5-10 mm. Inflorescences terminal or axillary racemes, often aggregated into panicles, pubescent to glabrous, 4-25 cm long; bracts small, caducous. Flowers bisexual, sub-actinomorphic to zygormophic; calyx comprising a short hypanthium and 5 sepals, glabrous to pubescent, the lower sepal cucullate, covering the other 4 sepals in bud; petals 5, free, yellow to white, equal to slightly differentiated, claws pubescent, the median petal sometimes inrolled; stamens 10, free, filaments pubescent (occasionally glabrous); ovary pubescent, stigma chambered. Fruit a red to brown samara, the basal seed-containing portion 12-20 x 8-15 mm, reticulate or smooth, glabrous to pubescent, the upper suture much prolonged and broadly winged, the wing 20-45 mm long and usually wider distally, 1 (-2)-seeded. Geographic distribution. A genus of 10 species; one in southern tropical Africa, East Africa and Arabia, nine in SE Asia (one endemic to India, two in China, four in Indo-China [one endemic to Thailand, two extending to Malesia], three restricted to the Malay Peninsula and Archipelago [one endemic to the Philippines]). Habitat. Seasonally dry tropical upland evergreen forest, riverine and humid forest, woodland and wooded grassland. Etymology. From ptero - (Greek: wing) and lobion (Greek: pod, fruit), in reference to the fruit which is a samara. Notes. Vidal and Hul Thol (1974) published a revision of Pterolobium , with a key to species. We provide below a list of species currently accepted in the genus, taking into account the treatment of Pterolobium sinense as a synonym of Pterolobium macropterum ( Chen et al. 2010b ). References. Roti-Michelozzi (1957) ; Brenan (1967 : 40-42); Vidal and Hul Thol (1974 , 1976 ); Hul Thol and Hideux (1977) ; Hou et al. (1996 : 654-700); Chen et al. (2010b) . Figure 23. Pterolobium stellatum (Forssk.) Brenan. A part of flowering branch B flower C longitudinal section of flower D petal E stamen F infructescence with mature fruits G samara with part cut away to reveal seed. A-E from Richards 11275 F from Eggeling 3400 G from Sandwith 25. Drawn by L. M. Ripley, originally published in Flora of Tropical East Africa, Leguminosae subfamily Caesalpinioideae , page 41, fig. 7 (1967). Figure 24. Pterolobium stellatum (Forssk.) Brenan. A inflorescences (P. van Wyk, Africa, unvouchered ) B fruits (J. Anton-Smith, Africa, unvouchered ) C close up of fruits (B. T. Wursten, Flora of Zimbabwe (http://www.zimbabweflora.co.zw/speciesdata/image-display.php?species_id=127190&image_id=1), Zimbabwe, unvouchered ). Mezoneuron hildebrandtii Vatke D inflorescences (D. Du Puy, Majunga, Madagascar, Du Puy M286 (P)) E fruits (D. Du Puy, Antsiranana, Madagascar, Du Puy M273 (P)). Mezoneuron kauaiense (H. Mann) Hillebr. F flower and buds I fruit (D. Eickhoff, Wikicommons (https://commons.wikimedia.org/wiki/Category:Mezonevron_kavaiense) cultivated, Hawaii, U.S.A., unvouchered ). Caesalpinia crista L. emend. Dandy & Exell (? Ticanto ) G flowers H young fruits (P. Grard: Institut Francais de Pondichery , Andhra Pradesh, India, unvouchered ).