Neotropical Aquifoliaceae

Milton Groppo

Universidade de São Paulo, Departamento de Biologia, FFCLRP, Ribeirão Preto, SP, Brazil. 

Description

Trees or shrubs, usually evergreen, sometimes deciduous, rarely prostrate subshrubs (Ilex prostrata Groppo). Stipules present, small and often deciduous. Leaves alternate, rarely (sub)opposite, simple, usually glabrous, when pubescent, then the trichomes simple, lamina in some species black-doted, margins entire, crenate, serrate or spinescent. Inflorescences axillary, derived from thyrses: cymes, thyrsoids, fascicles or apparently solitary flowers. Flowers 4-6(-23)-merous, actinomorphic, unisexual by abortion (plants dioecious), sepals of valvate aestivation, little joined at base; petals usually white or cream, base connate to the base; stamens as many as the petals, alternate, reduced to staminodes in the female flowers; gynoecium syncarpic, with 4-6(-23) carpels, ovary superior, locule as many as the carpels, usually with one ovule each, placentation axillary, the ovule inserted at the top of the axis, style very short to absent, stigma flat or discoid; gynoecium reduced to a pistillode in the male flowers. Fruit a drupe, with 1-6 pyrenes, with one seed each, epicarp red, purple or virtually black, mesocarp fleshy. Seeds with oily, proteinaceous, abundant endosperm.

Distribution in the Neotropics

  • In the Neotropics, Ilex L. can be found from sea level up to ca. 4,000 metres (Andes).

Distinguishing characters (always present)

Other important characters

Key differences from similar families

  • Aquifoliaceae is frequently confused with Celastraceae (Maytenus Molina spp.) and Symplocaceae (Symplocos Jacq.).
  • From Maytenus it is readily distinguished by the lack of a disc in the flowers (conspicuous in Maytenus), and the fruit (drupe vs. capsule in Maytenus).
  • Leaves in species of Ilex are not pruinose (covered with a wax layer) like in many species of Maytenus. Additionally, the top of the branches in Maytenus is, in many species, 4-angled or striate, or even winged.
  • In Ilex the branches are usually rounded in transverse section.
  • Symplocos species often bear flowers with 5-100 stamens (in 1-4 whorls), with a nectariferous disc surrounding the style base (absent in Ilex). The style is clearly distinct from the ovary (short or absent in Ilex), this (sub) inferior (superior in Ilex).
  • Leaves in Symplocos usually become light-green when dry, different from Ilex (grayish or dark-colored).
  • Additionally, many species of Symplocos have glandular-denticulate leaves.

Number of genera

  • One genus, Ilex, worldwide, with more than 500 species, ca. 300 of them in Tropical America.
  • Nemopanthus Raf.  (one species in North America) was recently included under the synonymy of Ilex (Powell et al. 2000).

Useful tips for generic identification

  • Trees or shrubs with simple usually alternate leaves.
  • Flowers usually white or cream, small, with joined petals at base.
  • Ovary syncarpic with short or absent style.
  • Fruit a red, purple or virtually black drupe with 4-6 pyrenes.
  • Although the plants are dioecious, the presence of staminodes in the pistillate flowers and of a pistillodium in the staminate flowers may misinterpret the flowers as bisexual

Status

  • Ilex (Native)

General notes

  • Several species of Ilex (e.g. I. aquifolium L., I. cornuta Lindl. & Paxton, I. crenata Thunb., and I. opaca [Soland.] ) are cultivated as ornamentals, mainly because their decorative fruits and/or foliage. However, their use in the Neotropics as ornamentals is occasional.
  • The species with most economic importance in the Neotropics is by far Ilex paraguariensis A.St.-Hil., native in Argentina, Brazil, Paraguay, and Uruguay. From the leaves of this species is made a tea, the "mate", "erva-mate" or "yerba-mate", largely consumed in South Brazil, Argentina, Paraguay and Uruguay. Mate is a part of the popular culture in those places, being characteristically served hot in a gourd (called "cuia" in Brazil) and drank with a straw (the "bomba"). It can be also be served as a cold beverage ("tererê"), usually in a decorative cow horn, especially in Paraguay and Brazil.
  • Other species of llex, such as I. dumosa Reissek or I. theezans Mart. were sometimes used in the past as substitutes of the true mate.
  • Other species, as I. tarapotina Loes. (Colombia and Peru) and I. vomitoria Aiton
    (Mexico and North America) are used as teas, mainly because their emetic or stimulating effects.
  • The wood of some species (I. affinis Gardn., I. brevicuspis Reissek, I. cerasifolia Reissek, I. dumosa,  and I. theezans) is locally used in Brazil in works of carpentry, and as fuel.

Important literature

Andrews, S. 1985. A checklist of Aquifoliaceae of Bahia. Rodriguésia 37(63): 34-44.

Baas, P. 1974. The wood anatomical range in Ilex (Aquifoliaceae) and its ecological and phylogenetic significance. Blumea 21: 193-258.

Edwin, G. & Reitz, r. 1967. Aquifoliaceae. In: Reitz, R. (ed) Flora Ilustrada Catarinense. Herbário Barbosa Rodrigues, Itajaí.

Giberti, G.C. 1979. Las especies argentinas del género Ilex (Aquifoliaceae). Darwiniana 22(1-3): 217-240.

Giberti, G.C. 1994. Aquifoliaceae. In: Spichiger, R. & Ramella, L. (eds.) Flora del Paraguay. Conservatoire et Jardin botaniques de la Ville de Genève/Missouri Botanical Garden.

Groppo, M. 2003. Aquifoliaceae. in: Cavalcanti, T.B. & Ramos, A.E. (orgs.) Flora do Distrito Federal, Brasil. v.3: 51-62. Embrapa Recursos Genéticos e Biotecnologia

Groppo, M. & Pirani, J.R. 2002. Aquifoliaceae. In In: Wanderley, M.G.L., Shepherd, G.J., Giulietti, A.M. (Coord.). Flora Fanerogâmica do Estado de São Paulo. vol. 2: 31-37. São Paulo, Fapesp/HUCITEC.

Loesener, T. 1942. Aquifoliaceae. In A. Engler & K. Prantl (Eds.) Die Natürlichen Pflanzenfamilien 2nd ed. 20b: 36-86. Wilhelm Engelamnn, Leipzig.

Loizeau, P.-A. 1994. Les Aquifoliaceae péruviennes. Boissiera 48: 1-306.

Loizeau, P.-A. & Spichiger, R. Aquifoliaceae. In N. Smith, S.A. Mori, A. Henderson, D.W. Stevenson & S.V. Heald (eds.) Flowering Plants of the Neotropics. p. 26-27. Princeton University Press, Princeton and Oxford.

Powell, M., Savolainen, V., Cuénoud, P., Manen J.-F. & Andrews, S. 2000. The mountain holly (Nemophantus mucronatus) revised with molecular data. Kew Bulletin 55: 341-347.

Reissek, S. 1861. Ilicineae. In C.P.F Martius & A.W.Eichler (eds.) Flora brasiliensis. 11(1): 37-80. Monachii. Lipsiae.

Viani, R.A.G. & Vieira, A.O.S. 2007. Flora arbórea do rio Tabagi (Paraná, Brasil): Celastrales sensu Cronquist. Acta Botanica Brasilica 21(2): 457-472.

How to cite

Groppo, M. (2009). Neotropical Aquifoliaceae. In: Milliken, W., Klitgård, B. & Baracat, A. (2009 onwards), Neotropikey - Interactive key and information resources for flowering plants of the Neotropics. http://www.kew.org/science/tropamerica/neotropikey/families/Aquifoliaceae.htm.