Bot. Jahrb. Syst. 21: t. 2 (1896), original illustration
Full name and orig. publication: Goyazia Taub., Bot. Jahrb. Syst. 21: 451 (11 Feb. 1896).
Etymology: Named after the community of Goyaz (or Villa-Boa de Goyaz), in Brazil.
Synonyms: -
Infrafamilial position: Gesnerioid Gesneriaceae (Gesnerioideae) - Gloxinieae.
Description: Small, perennial, saxicolous herbs with scaly rhizomes. Stem thin, stiff, wiry. Leaves opposite, somewhat anisophyllous; petiole short, swollen; lamina thick-leathery, with pericraspedodromous venation (side veins reading the margins, joining the superadjacent secondaries, and surrounding the total lamina at the margin). Flowers axillary, solitary, with short pedicel. Corolla with straight, subcampanulate tube, slightly widening towards the throat, limb oblique, with subequal lobes. Stamens 4, included, adnate to corolla base; filaments slender; anthers subreniform, coherent. Nectary annular, 5-lobed. Ovary superior, ovoid-globose; stigma bilobed. Fruit a dry, bivalved capsule.
Chromosome number: Unknown.
Species number: 2 [G. rupicola Taub., G. petraea (S.M.Phillips) Wiehler].
Species names (incl. publication and synonyms): See Skog, L.E. & J.K. Boggan. 2005: World checklist of Gesneriaceae: http://persoon.si.edu/Gesneriaceae/Checklist.
Type species: Goyazia rupicola Taub.
Distribution: C Brazil (Planalto).
Ecology: Terrestrial herbs growing on damp and mossy rocks; dormant in winter.
Notes: The genus is still little known. It is said to be related to Achimenes, Eucodonia, Gloxinia, and Monopyle by Wiehler (1983), differing by the thin, wiry stems, the short, swollen petiole, and the thick, leathery leaves exhibiting an unusual (pericraspedodromous) venation pattern. Molecular (ndhF) data (Smith 2001, Roalson et al. 2005a,b), however, suggest a closer affinity with Moussonia and Gloxinia.
Selected references: Wiehler, Selbyana 1: 395 (1976), emend. & rev.; Wiehler, Selbyana 6: 1-219 (1983); Smith, Ann. Missouri Bot. Gard. 88: 135-143 (2001), molec. syst.; Roalson, Boggan, Skog, Zimmer, Taxon 54(2): 389-410 (2005a), molec. syst.; Roalson, Boggan, Skog, Selbyana 25(2): 225-238 (2005b), tax.; Boggan, Gesneriads 56 (3): 26-32 (2006), surv.
Bibliography: See Skog, L.E. & J.K. Boggan. 2005. Bibliography of the Gesneriaceae. 2nd edition: http://persoon.si.edu/Gesneriaceae/Bibliography.
Illustrations:
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Goyazia rupicola Taubert, type species Bot. Jahrb. Syst. 21: t. 2 (1896), original illustration |
last modified: 2007-07-13