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Baccharis chionolaenoides (Asteraceae), a new species of subgenus Tarchonantoides from Santa Catarina State (Brazil)/Baccharis chionolaenoides (Asteraceae), una nueva especie del subgenero Tarchonantoides del estado de Santa Catarina (Brasil).

INTRODUCTION

The genus Baccharis L. is comprised of five subgenera: Baccharis, Molina (Pers.) Heering, Pteronioides Heering, Stephananthus (Lehm.) Heering, and Tarchonantoides Heering (Heering, 1904). The subgenus Tarchonantoides is well defined by non-tufted indument, functionally male flowers with short and free style branches, and female flowers with broad corollas with five papillose teeth, short style branches, pappus with several series of accrescent and persistent bristles (non accrescent, deciduous only in B. curitybensis Heering ex Malme), and by short or long twin trichomes on cypselas. The subgenus includes the "Lanugobaccharis" group of Hellwig (1996). It comprises 18 species with greatest center of diversity in southeastern Brazil with 17 species (Deble, unpubl. data).

Giuliano (2005) described the monotypic section Curitybenses with Baccharis curitybensis because this species shows several contradictory characters which make it problematic for placement within any described subgeneric taxon. The author related, by pappus bristles in two deciduous series and cypselas 10-ribbed, the singular B. curitybensis with the subgenus Baccharis, but recognized that the non-tufted indument, the free style branches of the functionally male flower, the glandular apex of the female flower and the twin trichomes on the cypsela wall not occur in any species of subgenus Baccharis. Muller (2006) placed B. curitybensis in the subgenus Tarchonantoides, and this concept is accepted in the review of the subgenus from Brazil (Deble, unpubl. data). The analyses of collections made in Urubici (Santa Catarina, Brazil) evidenced a new species closely related to B. curitybensis, described herein.

TAXONOMIC TREATMENT

Baccharis chionolaenoides D. Falkenberg & Deble, sp. nov. TYPE: BRAZIL, Santa Catari na, Urubici: extremo sul do topo do Morro da Igreja, pouco alem da area cercada pelo CINDACTA, &, 06-XII-1996 (fl. and fr.), D. B. Falkenberg 8961 (holotype, FLOR!; isotypes, CTES! SI! MBM! UEC!). Fig. 1.

A Baccharis curitybensi primo aspectu, sed foliis ad apicem ramorum coronatis, basi in pseudopetiolo longe attenuato (vs. foliis petiolatis), cypselis majoribus, 2.4-3.2 mm (versus 1.3-1.8 mm), obconicis (versus cylindricis), cum paucis (versus densis) pilis geminis vestitis, setis pappi florum marium apice non plumoso (versus plumoso), cellulis apicalibus in papillas longas, ascendentes erectisve, acutas (versus patentes, subclavatas) productis bene differt.

Subshrubs 0.3-0.4 m high; stems spreading or erect, dichotomously branched; young shoots densely orange- to yellow-lanuginose; older shoots ochre to darker. Leaves elliptic to oblanceolate, 2.2- 6.4 cm long, 0.7-2.4 cm wide, spirally alternate, crowded at the apex of the branches, discolorous, margin entire, revolute, apex slightly acute to obtuse, base long-attenuate in a pseudopetiole up to 2.5 cm long; leaf blade coriaceous, greenish brown, olive or light brown, 3-veined from near base, adaxially glabrous or sparsely floccose in the proximal third and prominently reticulate-veined, densely yellow, ochre or yellowish-ochre lanuginose, apparently 3-veined abaxially; young leaves adaxially with dense to sparser deciduous whitish hirsute trichomes, abaxially densely orange to yellow lanuginose. Capitulescence in terminal corymbs of 4-9 capitula. Capitula pedunculate; peduncles densely ochre lanuginose, up to 3.8 cm long; bracts 0-1, lanceolate, up to 2.5 mm long. Female capitula hemispheric, 9.5-12.2 mm long, 9.5-14.2 mm wide, involucre 6.3-9.8 mm long, 7.3- 11.5 mm wide, flowers 46-63. Involucral bracts in 4-5 series, cartilaginous, abaxially densely ochre lanuginose, 1-3-veined, veins dark brown, visible only on the ventral surface. Outer bracts ovate-lanceolate, 3.8-5.2 mm long, 1.4-2 mm wide, median bracts elliptic to elliptic-lanceolate, 4.4-6.5 mm long, 1.2-1.6 mm wide, inner bracts lanceolate to linear-lanceolate, 4.9-6.2 mm long, 1-1.4 mm wide. Clinanthium flat, with scattered whitish flagellate trichomes. Corolla tubular, 3.1-4 mm long, apically with five acute, papillose teeth up to 0.3 mm long. Style slightly exceeding the corolla, 4-5 mm long; style branches lanceolate, 0.8-1 mm long. Pappus yellowish, 3.9-5.2 mm long; bristles 45-64, multiseriate, deciduous. Cypsela obconical, 2.4-3.2 mm long, brown, 10ribbed, with sparse twin trichomes. Male capitula hemispheric, 6.5-8.6 mm long, 7.8-13 mm wide, involucre 4.8-6.5 mm long, 7.8-12.5 mm wide, flowers 43-58. Involucral bracts in 3-5 series, cartilaginous, dorsum dense ochre lanuginose, 1-veined, veins dark brown, visible only on the ventral surface. Outer bracts lanceolate, 3.5-4.5 mm long, 1.1-1.5 mm wide, median bracts lanceolate to elliptic-lanceolate, 4.1-4.9 mm long, 1.2-1.6 mm wide, inner bracts elliptic-lanceolate to elliptic, 4.4-5.4 mm long, 0.9-1.3 mm wide. Clinanthium flat, densely covered by whitish flagellate trichomes. Corolla 4.2-5.1 mm long; tube 2-2.9 mm long, with a few trichomes scattered in the distal half; lobes 1.8-2.2 mm long. Style not or slightly exceeding the corolla, 4-4.6 mm long; branches free, lanceolate, 0.6-0.8 mm. Anthers 1-1.1 mm long. Pappus yellowish, 3.8-5 mm long; bristles 31-52, multiseriate, narrowed at apex. Abortive cypsela cylindrical, 0.5-1 mm long, glabrous.

Distribution and habitat. Baccharis chionolaenoides is known only from type population, which occurs in Morro da Igreja, Aparados da Serra Geral, Urubici city, where it was found on cliffs of volcanic rock, at 1,800 m altitude.

Observations. Baccharis chionolaenoides is placed within section Curitybenses Giuliano, being easily distinguished from B. curitybensis by leaves crowded at the apex of the branches, a long leaf base attenuated into pseudopetiole (vs. distinctly petiolate), pappus of the functionally male flower non-plumose, apical cells projected like long, erect, acute papillae (vs. plumose, with apical cells projected like long, patent, subclavate papillae), and cypselas obconical, 2.4-3.2 mm long (vs. cylindrical, 1.3-1.8 mm), sparsely clothed by twin trichomes (vs. densely clothed by twin trichomes).

The section Curitybenses comprises two species, that occur in south (Santa Catarina and Parana states) and southeastern (Sao Paulo state) Brazil, being segregated from the other species of the subgenus Tarchonantoides by cypselas essentially 10-ribbed (very rarely 9 or 11) and non-accrescent, deciduous pappus of female flowers.

[FIGURE 1 OMITTED]

Paratypes

BRAZIL. Santa Catarina. Urubici, extremo sul do topo do Morro da Igreja, pouco alem da area cercada pelo CINDACTA, [masculinidad], 29-I-1997 (fl.), D. B. Falkenberg 9421 (FLOR!); idem, 16-X-1993, D. B. Falkenberg 6290 (FLOR!); idem, [masculinidad], 06-XII1996 (fl.), D. B. Falkenberg 8962 (FLOR!); idem, [masculinidad], 03-XI-1996 (fl.), D. B. Falkenberg 8724 (FLOR! CTES! SI! MBM! UEC!); idem, 08-X1996, D. B. Falkenberg 8378 (FLOR!); idem, 18VI-1996, D. B. Falkenberg 7958 (FLOR!).

Etymology. The specific epithet refers to its habit resembling species of the genus Chionolaena DC. (Asteraceae), especially Chionolaena latifolia.

Key to species of Baccharis section Curitybenses

1. Leaf base attenuate in a pseudopetiole. Cypsela obconical, 2.4-3.2 mm long, sparsely clothed by twin trichomes. Pappus of functionally male flower non-plumose, with apical cells projected like long, erect, acute papillae ... B. chionolaenoides

1. Leaf base distinctly petiolate. Cypsela cylindrical, 1.3-1.8 mm long, densely clothed by twin trichomes. Pappus of functionally male flower plumose, with apical cells projected like long patent, subclavate papillae ... B. curitybensis

ACKNOWLEDGEMENTS

We are grateful to the two anonymous reviewers for helpful suggestions and corrections. The discovery of this species occurred during fieldwork for the thesis of the first author, done at CPG Biologia Vegetal, Unicamp (SP, Brazil) under the direction of George J. Shepherd (UEC).

Original recibido el 21 de septiembre de 2009, aceptado el 17 de marzo de 2010.

BIBLIOGRAPHY

Giuliano, D. A. 2005. New infragenera in Baccharis. Novon 15: 534-541.

Heering, W. 1904. Die Baccharis-Arten des Hamburger Herbars. Jahrbuch der Hamburgischen Wissenschaftlichen Anstalten 21(3): 1-46.

Hellwig, F. H. 1996. Taxonomy and evolution of Baccharidinae (Compositae), in D. J. N. Hind & H. J. Beentje (eds.), Compositae: Systematics. Proceedings of the International Compositae Conference, Kew 1: 575-590.

Muller, J. 2006. Systematics of Baccharis (Compositae-Astereae) in Bolivia, including an overview of the genus. Systematic Botany Monographs 76: 272-278.

Daniel de Barcellos Falkenberg (1) & Leonardo Paz Deble (2)

(1) Departamento de Botanica, UFSC, 88040-900, Florianopolis, SC, Brasil; daniel@ccb.ufsc.br (author for correspondence)

(2) Departamento de Ciencias Florestais, UFSM, 97105-900, Santa Maria, RS, Brasil.
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Author:de Barcellos Falkenberg, Daniel; Deble, Leonardo Paz
Publication:Darwiniana
Article Type:Report
Date:Jul 1, 2010
Words:1329
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