Ormosia altimontana Meireles & H.C. Lima

Meireles, Jose Eduardo & Lima, Haroldo Cavalcante De, 2013, A new species of Ormosia (Leguminosae, Papilionoideae, Sophoreae) from the Brazilian Atlantic Rain Forest, Phytotaxa 143 (1), pp. 54-60: 55-58

publication ID

http://doi.org/ 10.11646/phytotaxa.143.1.3

persistent identifier

http://treatment.plazi.org/id/C04187BA-FFAD-FFE2-F78B-FD29FF7FFEF8

treatment provided by

Felipe

scientific name

Ormosia altimontana Meireles & H.C. Lima
status

sp. nov.

Ormosia altimontana Meireles & H.C. Lima   , sp. nov. ( Figures 1 View FIGURE 1 and 2 View FIGURE 2 )

Ormosia altimontana   differs from O. friburgensis   and O. ruddiana   by a combination of fewer leaflets (5–7 versus 9–13), with longer pulvinules (4 –10 mm versus 1–4 mm), a densely tomentose golden to fulvous abaxial surface, and prominent secondary veins, and slightly longer flowers (11–12 mm long versus 8–10 in O friburgensis   , flower length unknown in O ruddiana   ).

Type:— BRAZIL. Rio de Janeiro: Nova Friburgo, Reserva Ecológica de Macaé de Cima , Rio das Flores, Trilha para o Pirineus , 13 December 1997 (fl), H.C. de Lima et al. 5515 (holotype RB!, isotypes NY!, K!, SPF!)  

Trees to 20 m high; young branches, stipules, leaves, inflorescences and fruits densely to sparsely tomentose with golden to fulvous hairs; stipules triangular, 10–12 × 8–10 mm, tomentose, early caducous. Leaves alternate, imparipinate, petiole (1.5–) 2.5–3.5 (–5) cm long, rachis (2.8–) 4.5–6.5 (–9) cm long; leaflets 5–7, opposite, the pulvinule wrinkled, (4–)5–7(–10) mm long, the blade elliptic to oblong, rarely ovate, coriaceous, 4–10 × 1.5–4 cm, basally attenuate to obtuse, apically acute, rarely obtuse, the margins revolute, the adaxial surface glabrous, the abaxial surface tomentose with golden to fulvous hairs, the secondary veins prominent abaxially, 9 to 14 pairs, essentially straight and parallel, diverging from midrib by 45º to 60º angles. Inflorescences paniculate, terminal, densely to sparsely tomentose; bracts lanceolate, 3.5–4 × 1 mm. Flowers papilionoid, 11–12 mm long; pedicel 1 mm long, bracteoles 2, lanceolate, 2.5 × 0.5 mm, attached to the base of calyx; calyx campanulate, 8 mm long, the base gibbous, the tube 5 mm long, the teeth triangular, 3 × 2,5– 3 mm, the apex acute; corolla violet, the standard orbicular with the blade 9 × 9 mm and the claw 3 mm long, the wings oblong with the blade 8 × 2.5–3 mm and the claw 2 mm long, the keel petals free, obovate in outline, with the blade 7–7.5 × 3–3.5 mm and the claw 2.5 mm long. Stamens 10, filaments free, alternating long and short, varying from 4 – 7 mm long; anthers slightly dimorphic, ca. 0.5 mm long on the long stamens and ca. 0.3 mm on the short ones. Gynoecium 8.5 mm long; stipe 0.5 mm; ovary 4.5 mm long, tomentose; style 3.5 mm long, curved; stigma entire, papillate. Fruits indehiscent, 3–4.5 × 2– 2–7 cm, woody, the seed chamber inflated; young fruit wrinkled, densely tomentose with golden to fulvous hairs; mature fruits sparsely tomentose to glabrous, brown. Seeds 1 (–2) per fruit, essentially globose to slightly elliptic, rarely dorsoventrally compressed, 1.2–1.6 x 1.4–2.2 x 1.4–1.8 cm, testa deep red, orange/yellow surrounding the hilum; hilum elliptic to oblong, 4–6 × 2 mm.

Additional specimens: — BRAZIL. Rio de Janeiro: Mun. Nova Friburgo, Reserva Ecológica de Macaé de Cima, trilha para pedra da Bicuda, 22ºS, 43º03’W, 17 August 1990 (fr), M.P.M. de Lima et al. 201 (RB! K! SP!); Sitio Bakus, elevacão na frente da casa, 22º22’30.2’’S, 42º29’44.8’’W, 1450 m elev., 26 January 2006 (fr), H.C. de Lima et al. 6417 (RB!, UEC, K, MBM, NY); Sitio Bakus, Mata de encosta no topo do morro, 16 January 2008 (immat fl), H.C. de Lima et al. 6844 (RB!); Sitio Bakus, CTI, Mata de encosta no topo do morro, 17 January 2008 (immat fl), H.C. de Lima et al. 6852 (RB!); Sitio Sophronithes. Trilha por trás da casa, beirando o Rio das Flores, 16 February 2008 (immat fr), J.E.Meireles et al. 575 (RB!); Picada da Pedra Branca , 28 December 1989 (fr), M. Nadruz 547 (RB!) GoogleMaps   .

Distribution and phenology:— Ormosia altimontana   is known only from the municipality of Nova Friburgo, occurring at elevations above 1000 m in the upland Atlantic forest. Ormosia altimontana   was collected with flowers in December and February, and with fruits from the end of February to December.

Discussion:— According to Rudd (1965) in her infrageneric classification for the American species of Ormosia   , O. altimontana   should be assigned to section Ormosia   , series Excelsae Rudd (1965:309) due to the secondary veins of the leaflets being essentially straight and parallel and the pods indehiscent.

The new species is morphologically related to O. friburgensis Taub. ex Harms (1924: 290)   and to O. ruddiana Yakovlev (1970: 129)   . All three species have large, globose, deep red to orange colored seeds. However, O. friburgensis   and O. ruddiana   have more numerous [(7–) 9–13 versus 5–7], thinner leaflets with less conspicuous secondary veins, a glabrate (versus tomentose) abaxial surface, and shorter pulvinules [(1–)2–3(–4) mm long]. The flowers of O. ruddiana   are unknown, but the flowers of O. friburgensis   tend to be shorter than those of O. altimontana   [8–10(–11) mm versus 11–12 mm].

The results of the Principal Component Analysis of morphometric measurements of vegetative traits for the three closely related species is presented in Figure 3 View FIGURE 3 . The ordination shows that O. altimontana   specimens form a distinct cluster that is clearly separate from another cluster containing specimens of O. friburgensis   and O. ruddiana   . That separation occurs mainly along Component 1 (x axis on figure 3), which seems to be mostly associated with the traits: hair density (‘HairDensity’), secondary vein number (‘SecondVein_N’), pulvinule length (‘Pulvinule’), and leaflet number (‘Lflt_N’). On the other hand, traits related to leaflet dimension (‘Lflt_W’ and ‘Lflt_L’) and rachis length (‘Rachis’) were mostly associated with intra specific variation. The distinction between specimens of O. friburgensis   and O. ruddiana   is less clear, but revisiting the delimitation of these two species is beyond the scope of this study.

In spite of growing in the same geographic region, O. altimontana   does not co-occur with O. friburgensis   . The new species is only found in elevations above 1000 m whereas O. friburgensis   grows at lower altitudes. Extensive fieldwork has been conducted in the Macaé de Cima region and these two species were never found together. More importantly, no specimen with intermediate morphology between the O. friburgensis   and O. altimontana   was ever found.

Thus, we conclude that morphological and ecological differentiation between O. altimontana   and O.ruddiana   and O.friburgensis   are sufficient to support the recognition of O.altimontana   as a new and distinct species.

MBM

San Jose State University, Museum of Birds and Mammals

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Limoniidae

Genus

Ormosia