Portal de Periódicos da CAPES

New Species of Swartzia (Fabaceae: Faboideae) from Amazonia

1994; Missouri Botanical Garden Press; Volume: 4; Issue: 2 Linguagem: Inglês

10.2307/3391588

1945-6174

John J. Pipoly, Agustín Rudas Ll., Agustín Rudas Ll.,

Botany and Geology in Latin America and Caribbean

Studies in Amazonian plant diversity have revealed the presence of two new species of Swartzia, S. oscarpintoana Pipoly & Rudas and S. gracilis Pipoly & Rudas. RESUMEN. Estudios en diversidad vegetal amaz6nica revelaron la presencia de dos nuevas especies del genero Swartzia, S. oscarpintoana Pipoly & Rudas y S. gracilis Pipoly & Rudas. Swartzia oscarpintoana Pipoly & Rudas, sp. nov. TYPE: Colombia. Amazonas: Mcpio. La Pedrera, Inspecci6n Santa Isabel, Parque Nacional Natural Cahuinari, Rio Cahuinari, 01?28'S, 70?46'W, 300 m, 29 Nov. 1990 (fr), J. Pipoly, A. Rudas et al. 12886 (holotype, COL; isotypes, F, FMB, GH, K, MO, NY, US). Figure 1. Quoad stylum terminalem, stigma capitellatum atque ovarium arcuatum fusiformeque, praeclare acl sectionem Terminalem pertinet, et intra has propter ramulos dense chocolatino-nitido-velutinos, foliola imparipinnata coriacea supra nitida subtus dense chocolatino-velutina, inflorescentiam ramulinam racemosamque allopatricae S. pictae valde arcte affinis, sed ab ea pedicellis cylindricis (non clavatis), bracteis caducis (non persistentibus), lobulis calycinis 5-6 (non 4), gynophoro ovarioque dense adpressovelutino (non glabro) denique stylo 8-12 (non 5-7) mm longo statim separabilis. Tree to 40 m tall x 38 cm DBH; branchlets, stipules, petioles, leaf rachis, petiolules, and abaxial leaflet surface velvety with shiny chocolate-brown hairs; branchlets strongly 6-10-ribbed, the ribs rounded, disappearing with age, 5-10 ram diam.; pith moderately hard. Stipules caducous, coriaceous, extremely widely ovate, 5-7 mm long, 6-8 mm wide, apex rounded, velutinous without, glabrous within, the margin entire. Leaves imparipinnate; petioles terete, 0.5-1 cm long, conspicuously pulvinate; rachis subterete, slightly canaliculate adaxially, (10-)14-19.5 cm long, stipellate at each pair of leaflets, the stipels coriaceous, ovate, 2-3 mm long, 2-2.5 mm wide, apex acute, densely velutinous; petiolules subterete, 2-3.5 mm long, densely velutinous; leaflets 4-6-jugate, coriaceous, dimorphic, the basal pair obovate to oblanceolate, (4.5-)56.5(-9) cm long, 2.2-3 cm wide, apex short-acuminate, base truncate, the midrib impressed above, prominently raised below, secondary veins 12-16 pairs, nitid and punctate above, densely velutinous below, the margin revolute, entire; other leaflets narrowly oblong to narrowly oblanceolate, (7.5-)1116 cm long, (1.8-)2.5-3(-4) cm wide, the apex abruptly acuminate, the acumen 0.7-1 cm long, the base obliquely truncate to subcordate, the midrib impressed above, prominently raised below, secondary veins 10-14, nitid and punctate above, densely velutinous below, the margin revolute, entire. Inflorescence ramuligerous, a simple axillary raceme, 10-20(-23) cm long; rachis erect, velvety with shiny chocolate-brown hairs; floral bracts coriaceous, ovate, 0.8-1.2 mm long, 0.6-0.8 mm wide, the apex acute, glabrescent above, densely velutinous below, caducous; bracteoles obsolete, without scars; pedicels cylindrical, 2-3(-5) mm long; calyx stiffly coriaceous, rupturing into 5-6 irregular lobes at maturity, 7-15 mm long, 3-6 mm wide, apex acute, densely appressed-velutinous without, glabrous within; corolla and androecium unknown; gynophore 1-2.5 cm long, the ovary fusiform, arcuate, 15-30 mm long, 3-5 mm diam., densely appressedvelutinous, the style black, 8-12 mm long, the stigma capitellate. Fruit, unknown. Distribution. Known only from the type, collected in Amazonas, Colombia, 300 m elevation. Ecology. Swartzia oscarpintoana grows in varzea forest on lateritic soils (rebalse alto), dominated by Lepidocaryum tenue Martius and Astrocaryum jauari Martius. It is a common element of the canopy at the margin of the varzea forest, on deep alluvial deposits near the terrafirme transition zone. Etymology. This species is named for Oscar Hernando Pinto, former regional director of INDERENA for the Amazon Basin of Colombia, whose collaboration and interest in the promotion of national parks as biodiversity research centers has NOVON 4: 165-168. 1994. This content downloaded from 207.46.13.118 on Sun, 11 Sep 2016 04:55:35 UTC All use subject to http://about.jstor.org/terms