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Network Scan Data Selbyana 23(2): 137-180. 2002. NEW SPECIES AND NOTES ON MYRTACEAE FROM NORTHERN SOUTH AMERICA BRUCE K. HOLST Marie Selby Botanical Gardens, 811 South Palm Ave., Sarasota, FL 34236-7726 USA. E-mail: [email protected] ABSTRACT. In preparation for the treatment of Myrtaceae for the Flora of the Venezuelan Guayana, two new combinations (Eugenia yatuae, Myrcia intonsa) and 12 new species are presented (Calyptranthes conduplicata, Calyptranthes nigrescens, Eugenia conduplicata, Eugenia magna, Marlierea convexivenia, Marlierea foveolata, Marlierea mcvaughii, Marlierea subcordata, Marlierea ventuarensis, Myrcia kylisto­ phylla, Myrcia liesneri, Myrciaria puberulenta), as well as notes on species distribution and circumscription. Key words: MYliaceae, Guayana Shield, Venezuela, Guianas, Brazil, Colombia, Peru, Bolivia, Ecuador INTRODUCTION The neotropical genera of M yrtaceae most in need of study are Myrcia and Eugenia. Because In preparation for the treatment of the Myr­ of their large sizes, no one has attempted to treat taceae for the Flora of the Venezuelan Guayana, them as a whole since the major publications of 12 new species were found as well as numerous Berg (1855-1856, 1857-1859, 1861). A serious new records for the Venezuelan Guayana and for problem is the lack of naturally delimited sub­ the Amazonian regions of Colombia, Peru, Bra­ groups within the genera that would provide zil, and Bolivia. Additionally a number of col­ workable units. The previous attempts have lections in the past two decades have provided proven either artificial, i.e., Berg's division of critical material needed to augment previously Eugenia based on shape of the inflorescence, or incomplete descriptions. unworkable on a large scale, i.e., the sections by Notes presented here are not limited to spe­ McVaugh (1969) in Myrcia, which even he not­ cies in the Venezuelan Guayana since, it was ed were somewhat artificial. Perhaps the greatest necessary to study Myrtaceae from the Guianas, contribution then that anyone could make to­ eastern Colombia, northern Brazil, northern Ve­ ward increasing the attractiveness of working on nezuela, and the Antilles. Sixteen genera are such huge genera is laying out the groundwork known to be native in the Venezuelan Guayana. for an effective subgeneric classification. That is Pimenta, Eucalyptus, and Syzygium have been beyond the scope of this work, but it should be found cultivated in the area being treated in the one of the principal goals for future research. Flora of the Venezuelan Guayana (the states of Amazonas, Bolivar, and Delta Amacuro), with Additionally, several morphological characters only Syzygium becoming naturalized. Certain in need of more study in the fleshy-fruited, species groups will be treated in a broad sense mainly neotropical Myrtoideae are anthers (mor­ in the Flora, especially in Eugenia and the sec­ phology, dehiscence), leaf venation, trichomes tion Myrcia of Myrcia. Select citations of type (types, branching), acicular appendages, and specimens and additional material examined are bark characters. presented here, as the format of the Flora of the Venezuelan Guayana and other checklists do not allow for extensive specimen citations. Any attempt to treat the species in any part of NEW SPECIES AND COMBINATIONS northern South America would be very difficult jf not for the previous works of McVaugh (l958b, 1969) in Bassett Maguire's Botany of Calyptranthes conduplicata B. Holst, sp. nov. the Guayana Highlands, that of Amshoff (1942, TYPE. Venezuela. Amazonas: Carretera San 1948, 1950) which culminated in her Myrtaceae Carlos-Solano, 2-6 km SO de Solano, 100 treatment in the Flora of Suriname (1951), and m, 25 Apr. 1974 (ft), G. Morillo, B. de Mor­ the Flora Neotropica treatments of Landrum illo & C. Wood 3940 (HoJotype: VEN; Iso­ (1981, 1986). types: MICH, MY). FIGURE 1. 137 138 SELBYANA Volume 23(2) 2002 Calyptranthes nigrescens B. Holst affinis, sed dis­ two collections from evergreen lowland forests tincta: petiolo crasso, 1.5-2 cm Ion go (nec 1-2 mm at 100-160 m elevation in southwestern Ama­ longo); foliis basi obtusis ad rotundatis (nec subcor­ zonas state, Venezuela. datis). Calyptranthes nigrescens B. Holst, sp. nov. Tree 6-10 m tall; inflorescence and vegetative TYPE: Rio Pasimoni, entre la boca y Piedra buds lightly pubescent with appressed whitish Arapacoa, 175 m, 01050'N, 66°45'W, 20-30 trichomes; branchlets laterally compressed in Oct 1986 (ft); B. Stergios & O. Martinez cross section. Leaves stoutly petiolate, the peti­ 9529 (Holotype: PORT; Isotypes: MO, NY, oles 1.5-2 cm long, 2 mm diameter, drying dark, shallowly channeled and mostly terete in cross SEL, US). FIGURE 2. section; blades drying dark reddish brown, ellip­ Calyptranthes multiflora O. Berg affinis, sed dis­ tic to oblong, 11-24 X 5-8.5 cm, coriaceous tineta: foliis 9-15 cm longis, subeordatis, eoriaceis when dry ("quebradiza" when fresh, fide Mor­ (nec 5-10 cm longis, aClltis ad cuneatis, membrana­ illo et al. 3940), glabrous, glands numerous, im­ ceis); baga 1.5-2.5 cm diam. (nec 0.5-0.8 cm diam.), pressed-punctate to plane on upper surface, parieti crassa (nee tenui); foliis, infiorescentiis et fruc­ slightly elevated on lower surface; apex abruptly tibus sieeatis uigris (nee atroviridibus nee olivaceis). acuminate-caudate, conduplicate-recurved in apical lA, base obtuse to rounded, slightly de­ Shrub or tree 4-12 m tall; glabrous with the exception of vegetative buds, which are ap­ current on petiole; midvein broad, plane or with two convex ridges on upper surface, secondary pressed-pubescent; the whole plant typically veins inconspicuous, ca. 16-20 per side, margin­ dries blackish; branchlets terete in cross section, al vein 2-3 mm from the margin and parallel to the nodes slightly thickened. Leaves subsessile, it. Inflorescences paniculate, 7-13 cm long in­ the petioles 1-2 mm long, stout; blades drying cluding peduncle, to 4.5 cm broad, axillary or blackish, particularly on upper surface, ovate to subterminal, 25-35-flowered, main axis laterally elliptic, 9-15 X 2-6 cm, coriaceous, glands in­ compressed in cross section; peduncles 1-2.4 conspicuous; apex acuminate, usually abruptly cm long; bracts not known, deciduous before an­ so and conduplicate, sometimes rounded and thesis; pedicels 0-2 mm long; bracteoles not with a short (ca. 1 cm long) acumen, base sub­ known, deciduous before anthesis. Flower buds cordate, appearing at times nearly peltate due to obovoid, ca. 3 mm long, glabrous without, apic­ the reflexed angle of the blade and overlapping ulate; hypanthium prolonged ca. 2 mm above blade tissue at the base; midvein convex to bi­ summit of ovary, strongly reflexed after anthe­ convex, broad, secondary veins numerous, in­ sis; calyx closed in bud, circumscissile, very thin conspicuous, marginal vein 0.5-3 mm from the and mostly deciduous after anthesis; petals 2 and margin and mostly parallel to it. Inflorescence perhaps a few vestigial ones as well, broadly of paired panicles in the leafaxils, 8-11 cm ovate to suborbicular, ca. 1.5 mm long. Stamens long, with relatively slender branches, axillary ca. 100; anthers ca. 0.3 mm long; filaments ca. to subterminal, 9-ca. 30-flowered; peduncles 1- 2.5 mm long. Ovary bilocular, ovules 2 per Joc­ 3(-4) cm long; bracts deciduous well before an­ ule; style stout, 4-5 mm long; stigma punctate. thesis; pedicels lacking in terminal flowers of 3- Fruits not known. Seeds not known. flowered branches or 4-7 mm long in lateral ones; bracteoles deciduous well before anthesis, Paratype: VENEZUELA. Amazonas: Dept. Ca­ acicular glands often present. Flower buds ob­ siquiare, Calio Miguel, 160 m, 02°50'N, ovoid, ca. 3 mm long, apiculate, calyptrate, oc­ 66°50'W, 20 Apr. 1991 (st), Aymard 9037 casionally tearing irregularly, glabrous; hypan­ (PORT, SEL). thium prolonged ca. 1 mm beyond the summit of the ovary, explanate after anthesis; calyptra Calyptranthes conduplicata is related to C. ni­ ca. 3 mm wide, glabrous within; petals 5, grescens B. Holst, C. multiflora O~ Berg, and C. clawed, 2~3 mm long. Stamens numerous; an­ forsteri o. Berg. It differs from C. nigrescens by thers oblong to nearly globose, ca. 0.3 mm long; having stoutly petiolate leaves (petioles 1.5-2 filaments ca. 5 mm long. Ovary 2-locular, the cm long) that are obtuse to rounded at base (vs. walls thick, ovules 2 per locule; style 4-5 mm 1-2 mm long and subcordate at base). From C. long; stigma punctate. Fruits purple-black to multiflora and C. forsteri, it is distinguished by black, 1.5-2.5 cm diameter, wall 2-3 mm thick. having the leaves abruptly acuminate-caudate Seeds 1, kidney-shaped, ca. 1.5 cm long, hypo­ and conduplicate (vs. short-acuminate and acute cotyl elongated, cotyledons contortuplicate. to obtuse at apex and plane) as well as by the stout and long pediceJs (vs. pedicels < 1 cm Paratypes: BRAZIL. Amazonas: Munic. S. Ga­ long). briel da Cachoeira, CUCU!, Igarape Bonte, Mata Calyptranthes conduplicata is known from de Igapo, OJ °21 'N, 66°50'W, 27 Oct. 1987 (past HOLST: MYRTACEAE 139 FIGURE 1. Calyptranthes conduplicata (Morillo et al. 3940, Isotype, MICH). 140 SELBYANA Volume 23(2) 2002 ft); Farney et al. 1807 (MO); Foz do rio Marie, 7514 (PORT, SEL); Dept. Rio Negro, Rio Yatua, aftuente do rio Negro, 00025'N, 66°24'W (fr), 4 entre la piedra Catipan y Ipaca, 2 Dec. 1984 (fr), Dec. 1987, Kawasaki 356 (MO, NY). COLOMBIA. Stergios & Aymard 7545 (MO, PORT, SEL); Guainfa: just south of jct. of Rio Negro, Rio Dept. Rio Negro, Rio Emoni, hasta aprox 8 km Guainia and Casiquiare, 65 m, 01°59'N, arriba de la boca, 17-18 Apr. 1985 (fr), Stergios 67°06'W, 25 Jun. 1984 (fr), Davidse & Miller & Aymard 8239 (PORT, SEL); Dept. Rio Negro, 26576 (MO, SEL, VEN); Rio Guainia, near Pta.
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