Davilla papyracea (Dilleniaceae), a New Species from Brazil Author(s): Gerardo A. Aymard C. Source: Kew Bulletin, Vol. 57, No. 2 (2002), pp. 487-490 Published by: Springer on behalf of Royal Botanic Gardens, Kew Stable URL: http://www.jstor.org/stable/4111133. Accessed: 28/02/2011 10:31 Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available at. http://www.jstor.org/page/info/about/policies/terms.jsp. JSTOR's Terms and Conditions of Use provides, in part, that unless you have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles, and you may use content in the JSTOR archive only for your personal, non-commercial use. Please contact the publisher regarding any further use of this work. Publisher contact information may be obtained at. http://www.jstor.org/action/showpublisher?publishercode=kew.. Each copy of any part of a JSTOR transmission must contain the same copyright notice that appears on the screen or printed page of such transmission. JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. Royal Botanic Gardens, Kew and Springer are collaborating with JSTOR to digitize, preserve and extend access to Kew Bulletin. http://www.jstor.org
KEW BULLETIN 57: 487-490 (2002) Davilla papyracea (Dilleniaceae), a new species from Brazil GERARDO A. AYMARD C.' Summary. Davilla papyracea Aymard, a new species with vaginate and winged petioles, from the state of Minas Gerais, Brazil is described and illustrated, and a key to this group of species is provided. While examining specimens of Dilleniaceae for a Flora Neotropica monograph, a new species from Brazil was recognized. This new species is known only from the Atlantic forest of the Brazilian state of Minas Gerais, and is the fifth species of this genus so far discovered which has vaginate and winged petioles. Davilla papyracea Aymard sp. nov. Davillae alatae (Vent.) Briq. et D. steyermarkii Kubitzki, congeneribus sectionis Homalochlenae Kubitzki valde affinis, sed petiolis vaginatis necnon pubescentia aurea ferrugineaque omnino plantam vestiente D. alatae ex Guianis atque Amapai in Brasilia magis pr6xima. A D. steyermarkii et D. alata foliis, petioli alis bracteolisque papyraceis, alis 7-14 mm longis, sepalis interioribus extus sparse adpresso-pubescentibus, staminibus 40-60 praesentibus differt. Typus: Brazil. Minas Gerais, P M. Andrade & M. A. Lopes 168 (holotypus BHCH!, isotypus PORT!). Lianas; branches and branchlets robust, covered by yellow adpressed trichomes when young, sparsely adpressed-pubescent when mature; bark yellow, flaking off when mature. Leaves chartaceous-papyraceous, ovate, ovate-elliptic, 11-21 x 5-11 cm, apex obtuse, mucronulate, base obtuse, smooth, lamina glabrous and papillose on upper surface, except along midrib, the midrib canaliculate and adpressed yellow-pubescent, sparsely adpressed-pubescent on lower surface except along midrib and secondary nerves, which are more adpressed-pubescent, margins not revolute, ciliolate, entire to subsinuate; secondary nerves 26-34, running straight towards margin, impressed on upper surface, raised on lower surface; petiole 1.5-2 cm long, canaliculate, vaginate, wings papyraceous, 7-14 mm wide, densely yellow adpressed-pubescent externally, glabrescent internally. Inflorescence paniculate, 3-4 cm long; rachis and pedicels adpressed yellow pubescent, pedicel 3-5 cm long, bracteole ovate, 4-7 mm long, papyraceous, sparsely adpressed-pubescent externally, glabrous internally. Sepals 5, unequal, suborbicular, glabrous internally, sparsely adpressed yellow-pubescent externally, the exterior sepals 3, 6-10 mm long, the interior sepals 2, coriaceous, compressed at margin, 1-1.5 cm long. Petals Accepted for publication December 2001. 1 UNELLEZ-Guanare, Programa de Recursos Naturales Renovables, Herbario Universitario (PORT), Mesa de Cavacas. Estado Portuguesa. Venezuela 2333. 487
488 KEW BULLETIN VOL. 57(2) not seen. Stamens 40-60, filaments 5-6 mm long, glabrous, anthers oblong, coma 1 mm long, glabrous; Carpels 2, glabrous, not lenticellate, styles 2, 8-10 mm long, glabrous, stigma capitate. Fruits not seen. Fig. 1. BRAZIL. MINAS GERAIS, Montes Claros-Caratinga, 22 February 1984, P M. Andrade & M. A. Lopes 168 (holotypus, BHCH!, isotypus, PORT!). DISTRIBUTION. Known only from the type locality. LOCAL NAME. "Cip6 Carij6" (Portuguese). HABITAT. Atlantic forest region. NOTES. Because the margins of the inner sepals are adpressed against each other to form alate margins, Davilla papyracea belongs to section Homalochlaena (Kubitzki 1971). The vaginate petioles and golden and ferrugineous pubescence on all parts of the plant suggest that this new species is most closely related to D. alata (Vent.) Briq. from the Guianas and Amapai, Brazil and D. steyermarkii Kubitzki from the Venezuelan-Brazilian border (Kubitzki 1980; Aymard 1998). Davilla papyracea can be distinguished from other species with vaginate and winged petioles by several characters, as summarised in the following key. KEY TO SPECIES OF DAVILLA WITH VAGINATE AND WINGED PETIOLES 1. Leaves, petiole wings and bracteoles papyraceous, blades ovate, ovate-elliptic, lateral veins 26-34; inflorescence 3-4 cm long; pedicels 3-4 mm long; stamens 40-60...... D. papyracea Leaves, petiole wings and bracteoles coriaceous or rigidly coriaceous, blades elliptic, oblong, lanceolate, or obovate-lanceolate, lateral nerves 6-22; inflorescence 5-18 cm long; pedicels 5-35 mm long; stamens 100-200... 2 2. Petiolar wings 4-14 mm wide; all parts of plant covered by a ferrugineous pubescence, or sparsely yellow pubescent...*... 3 Petiolar wings 1-3 mm wide; all parts of plant glabrous or sparsely pilose, not covered by a ferrugineous or yellow pubescence... 4 3. Leaves elliptic, upper surface smooth; sparsely yellow-pubescent, venation not lacunose-areolate on lower surface, glabrescent when mature; petioles 4-6 cm long; inner sepals golden-sericeous externally; petals 5, 10-15 mm long; stamens 100-150... D. alata Leaves obovate-lanceolate, upper surface scabrous; densely ferrugineous pubescent, venation prominently lacunose-areolate on lower surface; petioles 1-2 cm long; inner sepals ferrugineous externally; petals 3, 5-6 mm long; stamens 180-200...... D. steyermarkii 4. Branches and branchlets striate, scabrous; leaf blades lanceolate to lanceolate- elliptic, the lateral veins joining 1-2 mm from margin; petioles 3-5 cm long; sepals sparsely pilose externally; stamens 150-200, carpels lenticellate............. D. morii Branches and branchlets not striate, smooth; leaf blades elliptic to oblong, the lateral veins joining 3-5 mm from margin; petioles 1-3 cm long; sepals glabrous externally; stamens 120-130, carpels not lenticellate?? D. macrocarpa
NEW SPECIES OF DAVILLA FROM BRAZIL 489 FIG;. 1. Davilla papyracea. A habit;. B detail of midrib and secondary nerves covered by adpressed pubescence on lower surface; C flower with sepals removed to show stamens and the 2 carpels; D flowers with all sepals intact. Drawn from P M. Andrade & M. A. Lopes 168 by C. E. Armstrong
490 KEW BULLETIN VOL. 57(2) ACKNOWLEDGEMENTS The author is grateful to S. Mori (NY), J. M. Lock (K) and, an anonymous reviewer for comments and suggestions on the manuscript. I thank B. Manara (VEN) for the Latin diagnosis, the New York Botanical Garden for making its facilities available for my research, and C. E. Armstrong for preparing the illustration. REFERENCES Aymard, G. (1998). Dilleniaceae. In: P. E. Berry, B. K. Holst & K. Yatskievych (eds.), Flora of the Venezuelan Guayana 4: 676-685. Missouri Botanical Garden, St. Louis. Kubitzki, K. (1971). Doliocarpus, Davilla, und verwandte Gattungen (Dilleniaceae). Mitt. Bot. Staatssamml. Munchen 9: 1-105. 1 (1980). Eine neue Davilla art aus Venezuela. Mitt. Bot. Staatssmml. Miinchen 16: 501-502.