Volume 13 Number 1 2003 NOVON A New Species of Doliocarpus and a New Species of Tetracera (Dilleniaceae) from Brazil Gerardo Ay mard C. UNELLEZ-Guanare, Programa de R. N. R., Herbario Universitario (PORT), Mesa de Cavacas, Estado Portuguesa, Venezuela 2333 ABSTRACT. During the course of a taxonomic study of the Neotropical species of Dilleniaceae, two new species from Brazil were discovered: Do¬ liocarpus lombardii from the “Mata Atlantica’’ and Tetracera boomii from the “Mata de Restringa” and “Cerrado” vegetation dominated by Curatella americana L. The two new species are described, illustrated, and compared to closely related spe¬ cies. By its sessile inflorescence Doliocarpus lom¬ bardii is closely related to D. sessiliflorus Martius, but differs from that species in its longer leaf blades (9-22 cm long), densely pubescent on the lower surface; sepals 5, 6—1 1 mm long, ovate or elliptic, adpressed sericeous in midrib internally; and fruit densely hispid. Tetracera boomii is known only from two places in Bahia and Sergipe states, Brazil, and is similar to T. lasiocarpa Ei- chler in that both bear follicles 1—1.5 cm long, densely hispid at the apex; however, T. boomii dif¬ fers from that species in its leaves rigid-coria¬ ceous, elliptic, aerolate below and margins den¬ tate, inflorescences 1-2 cm long, bracteoles ca. 6 mm long, sepals 11—14, filaments 4-5 mm long, and aril completely covering the seed. Key words: Brazil, Dilleniaceae, Doliocarpus, Tetracera. Species of Doliocarpus Rolander are mostly lia¬ nas (rarely shrubs), with inflorescences that are ramiflorous, fasciculate, or glomerate, the ovary un- icarpellate, 1-celled, the fruit a berry, and seeds covered with white arils. Tetracera L. is the only genus in the Dilleniaceae with either unisexual or bisexual flowers; all Neotropical species are andro- dioecious (Dickinson, 1968; Kubitzki, 1970). Do¬ liocarpus includes about 45 species and Tetracera ca. 20; Brazil is the center of diversity for both genera. Tetracera boomii G. Aymard C., sp. nov. TYPE: Brazil. Bahia: Entre Rios, 23 km from Subau- ma on road to Entre Rios, 29 May 1981, S. A. Mori & B. M. Boom 14196 (holotype, CEPEC not seen; isotype, NY). Eigure 1. Haec species T. lasiocarpae affinis, sed ab ea foliis rig- ido-coriaceis ellipticis subtus areolatis margine dentatis, inflorescentia 1-2 cm longa dense adpresso-pubescente; sepalis 11 ad 14, petalis 4 intus dense sericeis, lilamentis 4—5 mm longis atque arillo semen omnino tegente. Liana, bark brown, flaking; branches and branchlets sparsely adpressed pubescent to gla- brescent when mature. Leaves elliptic, rigid-coria¬ ceous, 4—22 X 3—13 cm, base cuneate, apex rotun- date, scabrous and sparsely pilose on the upper surface, papillate and glabrescent on the lower sur¬ face, except for the midrib and secondary nerves, these sparsely adpressed pubescent, with stellate and simple trichomes, margins dentate mostly in the upper half, the veins elevated, areolate below, sunken above, with 6 to 15 parallel nerves on each side of mid-nerve, craspedodromous venation; pet¬ ioles 0.5-2.2 cm long. 1-4 mm wide, subwinged, canaliculate, adpressed pubescent. Inflorescence thyrsoid, axillary or terminal, 1—2 cm long, rachis densely adpressed pubescent, bracteoles lanceo¬ late, ca. 6 mm long, sparsely adpressed pubescent externally, sericeous internally mostly in the mid¬ dle, pedicel 0.5—5 mm long, 1 to 3 flowers per Novon 13: 1-4. 2003. 2 Novon lcm Figure 1. Tetracera boomii G. Aymard C. —A. Branch with leaves and inflorescences. —B. Upper leaf surface. —C. Upper part of the inflorescence. —D. Lower leaf surface. —E. Cross section of stem with vascular tissue arranged in bands separated by abundant parenchyma. (Drawn from the isotype, Mori & Boom 14196, NY.) cyme. Flowers androdioecious, bisexual; sepals 11- 14, unequal, the outer 4—10 mm long, broadly ovate, the inner 10—12 mm long, broadly ovate, sparsely adpressed sericeous externally, densely se¬ riceous internally, except at the margins; petals 4, obovate to oblanceolate, 8—12 mm long, glabrous externally, glabrous internally except in the mid¬ point, which is densely adpressed sericeous. Sta¬ mens 100—120, filaments 4—5 mm long, glabrous, anthers oblong, ca. 0.75 mm long; staminate flowers not seen. Caqiels 7 to 8, ca. 5 mm long, free, densely hispid sericeous, style ca. 2 mm long, gla¬ brous. Follicles 1 — 1.5 cm long, divergent, densely hispid at the apex, with large yellow trichomes; Volume 13, Number 1 2003 Aymard Doliocarpus and Tetracera 3 Table 1. Comparison of the distinguishing characters of Tetracera boomii and T. lasiocarpa. Tetracera boomii Tetracera lasiocarpa Leaves rigid-coriaceous, elliptic, areolate below; mar¬ gins dentate subcoriaceous, obovate or elliptic, without are- oles; margins mucronate-dentate Inflorescence 1—2 cm long, densely adpressed pubescent; bracteoles ca. 6 mm long 5-10 cm long, slrigose pubescent; bracteoles 2—4 mm long Sepals 11-14 7-9 Petals 4, densely sericeous at midpoint internally 5, glabrous internally Filaments 4—5 mm long ca. 3 mm long Aril completely covering the seed covering half the seed style persistent, 1—2 mm long; seeds 1 per carpel, 4—5 mm long, black, aril laciniate, completely cov¬ ering the seed. Distribution and habitat. Tetracera boomii is known only from two collections, in “Mata da Res- tringa” and “Cerrado” areas dominated by Cura- tella americana in the Brazilian states of Bahia and Sergipe. Because of its scabrous leaves and many-flowered cymes, Tetracera boomii belongs to the section Te¬ tracera (Kubitzki, 1970). Based on the size of the follicles (1—1.5 cm long), which are densely hispid at the apex with large yellow trichomes, this new species is related to T. lasiocarpa from Bahia, Brazil. However, T. boomii can be distinguished from T. la¬ siocarpa by the characters indicated in Table 1. This species is named in honor of Brian M. Boom, whose collections and fieldwork have added much to our knowledge of the Bahian flora. Paratypes. BRAZIL. Sergipe: Santa Luzia do Itanhi, 500 m S of Distrito de Castro, 29 Nov. 1993, S. C. de Sant'Ana et al. 480 (CEPEC, NY). Doliocarpus lombardii G. Aymard C., sp. nov. TYPE: Brazil. Minas Gerais: Parque Estadual do Rio Doce, Marlieria-Salao Dourado, 15 June 1995, ./. A. Lombardi