Stylogyne carautae Carrijo & M.F.Freitas

First published in Kew Bull. 64: 695 (2009 publ. 2010)
This species is accepted
The native range of this species is Brazil (Rio de Janeiro, NE. São Paulo). It is a tree and grows primarily in the wet tropical biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: threatened. Confidence: confident
[AERP]

Carrijo, T.T. & Freitas, M.F. 2009. Stylogyne carautae (Myrsinaceae), a new species from south-eastern Brazil. Kew Bulletin 64: 695. DOI: https://doi.org/10.1007/s12225-009-9151-1

Type
Brazil. Rio de Janeiro, Divisa Rio-São Paulo, M. A. N. Coelho 658 et al. (holotypus RB).
Morphology General Habit
Shrub, 4 – 5 m tall
Morphology Branches
Branches 2.7 – 3.4 mm diam., cylindrical, glabrous; mature terminal bud 7.3 mm long, with cylindrical, nigrescent glandular points or rust-coloured indumentum
Morphology Leaves
Leaves alternate, chartaceous, oblong-elliptical, 19.0 – 21.0 cm long, 7.0 – 8.0 cm wide, base attenuated, apex acute to apiculate, venation brochidodromous, principal vein thinning towards apex; secondary veins in 17 – 20 pairs, prominulous below, connected by a submarginal looping vein, densely translucent punctate and punctate-lineate below, margin entire, sub-revolute, decurrent to base of petiole; petiole canaliculate, 8.0 – 10.7 mm long, 1.9 – 2.8 (3.2) mm diam., glabrous; margins orange or dark punctate and punctate-lineate
Morphology Reproductive morphology Inflorescences
Inflorescence lateral, axillary and pseudo-terminal, paniculate-corymbous, 2.0 – 2.5 cm, centripetal, 4 – 5 flowers per corymb; bracts precociously deciduous
Morphology Reproductive morphology Flowers
Flowers 4-merous, dextral-twisted, petals not twisted in bud
Morphology Reproductive morphology Flowers Androecium Stamens
Staminate flowers 3.8 – 4.0 mm long at anthesis, bracts 0.8 – 0.9 mm long, sub-chartaceous, lanceolate, glabrous, margin entire, with tiny translucent glands apparent or not; pedicels cylindrical, 2.0 – 3.5 mm long, glabrous; calyx campanulate, 1.8 – 2.0 mm long, lobes sub-chartaceous, erect, ovate, glabrous, 1.2 – 0.8 × 1.3 – 1.9 mm, apex subtriangular, bases c. 0.3 mm fused, margin entire; corolla campanulate, glabrous, petals membranous, sub-equal, 3.7 – 4.4 mm long, tube 0.9 mm long, lobes elliptical, 3.6 – 3.9 × 1.5 – 1.9 mm, asymmetrical, reflexed, apex acute, slightly acuminate, inconspicuous orange punctate, margins entire, not hyaline; stamens 3.1 mm long, filaments 1.2 mm long, adnate to base of corolla tube; anthers basifixed, elliptical-lanceolate, 2.5 × 0.8 mm, dorsifixed, introrse, coloration uniform, dehiscent by lateral longitudinal slits with dilated apical pores, apex obtuse, apiculate, base cordate; pistillode absent or vestigial (conical)
Morphology Reproductive morphology Flowers Gynoecium Pistil
Pistillate flowers not observed
Morphology Reproductive morphology Fruits
Fruit spherical, 6.0 × 5.5 mm, conspicuously and prominently punctate and punctate-lineate; seeds spherical, endosperm spherical, perforated; embryo transverse
Distribution
Brazil: Rio de Janeiro and São Paulo states.
Ecology
Stylogyne carautae is restricted to the Coastal Atlantic Forest of São Paulo and Rio de Janeiro states, in the Serra do Mar mountain range. The species occurs in lowland wet forest, at 100 – 140 m altitude. The forest covers a 100 km wide strip along the coasts of southeast and southern Brazil, with a rugged topography of Precambrian rocks forming high summits with steep slopes (Mantovani1993). The climate is subtropical, with annual rainfall ranging from 1400 to 4000 mm, without a marked dry season.
Conservation
According to the IUCN (2001) Red List criteria, this species should be classified as Vulnerable VU B1abiii, as its extent of occurrence is estimated to be less than 20,000 km², and it is known to exist at no more than 10 locations with a continuing decline in area, extent and quality of habitat.
Note
This species is dedicated to Dr Jorge Pedro Pereira Carauta, a pre-eminent authority on the systematics of Moraceae. Stylogyne carautae belongs to a small group of taxa with 4-merous white flowers and pseudo-terminal and/or lateral inflorescences. Due to its leaves’ size and shape, and 4-merous flowers, S. carautae is closely related to S. depauperata. However, S. carautae can be easily distinguished by its brochidodromous leaf venation, pseudo-terminal and lateral inflorescences (not only lateral inflorescences), petals with an acute and asymmetrical apex (not rounded and symmetrical), with entire and membranous margins (not slightly erose and hyaline).
[KBu]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0
  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Bulletin

    • Kew Bulletin
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0