Taxon Details: Swartzia froesii R.S.Cowan
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Narratives:
Family:
Fabaceae (Magnoliophyta)
Fabaceae (Magnoliophyta)
Scientific Name:
Swartzia froesii R.S.Cowan
Swartzia froesii R.S.Cowan
Accepted Name:
This name is currently accepted.
This name is currently accepted.
Description:
Authors: Benjamin M. Torke and Vidal de Freitas Mansano
Type: Brazil. Amazonas: [Mun. São Gabriel da Cachoeira], São Joaquim, Rio Içana, 5 Apr 1952 (bud), R. L. Fróes 28396 (holotype: IAN-75199; isotype: US).
Description: Shrub or spindly tree, exceeding 5 m; young branchlets densely ferruginous-velutinous. Stipules narrowly ovate-lanceolate, ca. 8-11 mm, glabrous adaxially, densely subappressed velutinous abaxially, caducous, except for rotund base. Leaves imparipinnate, with 4 pairs of opposite lateral leaflets; petioles unwinged, 2.4-5.9 cm, densely subappressed ferruginous-velutinous, pulvinus ca. 1-2 cm; rachis unwinged, estipulate or essentially so, 14-38 cm, densely subappressed ferruginous-velutinous, stipels apparently minute or absent; petiolules 2.5-6 mm, densely subappressed velutinous; leaflet blades thickly chartaceous, ovate, elliptic or obovate, the margin deflexed, 9-25 x 4-11.2 cm, base obtuse or rounded to acute, apex obtuse to acuminate, upper surface mostly glabrous, sometimes velutinous on midrib at base, lower surface densely semi-erect pilose, densely subappressed velutinous on midrib, midrib and other venation impressed above, salient beneath, secondary veins ca. 7-9 on each side of midrib, strongly ascending, fading near margin. Inflorescences simple racemes, borne in leaf axils, sometimes 2-several fasciculate, to ca. 15-flowered; axes 2.5-11+ cm, densely subappressed ferruginous-velutinous; bracts ovate to triangular, 3.9-6.3 mm, glabrous adaxially, densely subappressed velutinous abaxially, sometimes stipulate, with stipules somewhat smaller than bracts and early caducous; pedicels apically dialated, 3.5-6.5 mm, densely semi-erect ferruginous-velutinous; bracteoles lacking; flower buds broadly ovoid to ellipsoid, 8.6-9.4 x 7.5-8.8 mm, densely subappressed ferruginous-velutinous. Calyx densely subappressed velutinous externally, mostly glabrous internally, velutinous at center in narrow ring around stamens; the segments 4-5, coriaceous, subequal, ovate to elliptic, 8-10 x 3-8 mm; petal white, glabrous internally, sericeous externally, claw ca. 2 mm, blade oblate, ca. 10 x 12 mm. Androecium glabrous, the stamens arranged in two groups; those of the abaxial group 3, filaments ca. 12.3 mm, anthers oblong in outline, ca. 2.6 mm; those of the adaxial group numerous, more than 50, filaments 7-12.5 mm, anthers oblong-elliptic in outline, 0.8-1.6 mm. Gynoecium with stipe 3-4 mm, glabrous to sparsely velutinous; ovary ca. 6.5 x 4 mm, densely golden sericeous-tomentose, locule glabrous, ovules ca. 13; style lateral at ovary apex, somewhat down-curved, 1.2-1.7 mm, glabrous, except at base; stigma punctiform. Fruits unknown.
Common names: No common names have been recorded.
Distribution: Known only from two locations along tributaries of the upper Rio Negro in northwestern Amazonas, Brazil.
Ecology: Swartzia froesii has been collected in low forest "capoeira" and shrubby "caatinga" on white-sands. Nothing else is known about its ecology.
Phenology: The species has been collected in flower and bud in March and April.
Taxonomic notes: Swartzia froesii belongs to Swartzia section Unifoliolatae. It appears to be very closely related to another poorly known species from northwestern Amazonia, Swartzia monachiana, with which it shares its dense indument, relatively large bracts and short pedicels, ovary stipe, and style. The latter species, which is known only in fruit, differs from S. froesii in its less pubescent leaflets, adaxially salient midrib and apparently glabrous ovary. Both species are probably closely related to an incompletely known and as yet undescribed species from Amazonian Venezuela (Stergios & Stergios 11413) that has smaller leaflets and bracts and a more appressed, sericeous indument.
Uses: No uses have been recorded.
Etymology: The specific epithet honors R. L. Fróes, collector of the type specimen.
Conservation status: The conservation status of Swartzia froesii is unknown. As of 2011, it has been collected in only two localities, both in the under-collected and largely intact ecosystems of the expansive Território Indígena Alto Rio Negro.
Authors: Benjamin M. Torke and Vidal de Freitas Mansano
Type: Brazil. Amazonas: [Mun. São Gabriel da Cachoeira], São Joaquim, Rio Içana, 5 Apr 1952 (bud), R. L. Fróes 28396 (holotype: IAN-75199; isotype: US).
Description: Shrub or spindly tree, exceeding 5 m; young branchlets densely ferruginous-velutinous. Stipules narrowly ovate-lanceolate, ca. 8-11 mm, glabrous adaxially, densely subappressed velutinous abaxially, caducous, except for rotund base. Leaves imparipinnate, with 4 pairs of opposite lateral leaflets; petioles unwinged, 2.4-5.9 cm, densely subappressed ferruginous-velutinous, pulvinus ca. 1-2 cm; rachis unwinged, estipulate or essentially so, 14-38 cm, densely subappressed ferruginous-velutinous, stipels apparently minute or absent; petiolules 2.5-6 mm, densely subappressed velutinous; leaflet blades thickly chartaceous, ovate, elliptic or obovate, the margin deflexed, 9-25 x 4-11.2 cm, base obtuse or rounded to acute, apex obtuse to acuminate, upper surface mostly glabrous, sometimes velutinous on midrib at base, lower surface densely semi-erect pilose, densely subappressed velutinous on midrib, midrib and other venation impressed above, salient beneath, secondary veins ca. 7-9 on each side of midrib, strongly ascending, fading near margin. Inflorescences simple racemes, borne in leaf axils, sometimes 2-several fasciculate, to ca. 15-flowered; axes 2.5-11+ cm, densely subappressed ferruginous-velutinous; bracts ovate to triangular, 3.9-6.3 mm, glabrous adaxially, densely subappressed velutinous abaxially, sometimes stipulate, with stipules somewhat smaller than bracts and early caducous; pedicels apically dialated, 3.5-6.5 mm, densely semi-erect ferruginous-velutinous; bracteoles lacking; flower buds broadly ovoid to ellipsoid, 8.6-9.4 x 7.5-8.8 mm, densely subappressed ferruginous-velutinous. Calyx densely subappressed velutinous externally, mostly glabrous internally, velutinous at center in narrow ring around stamens; the segments 4-5, coriaceous, subequal, ovate to elliptic, 8-10 x 3-8 mm; petal white, glabrous internally, sericeous externally, claw ca. 2 mm, blade oblate, ca. 10 x 12 mm. Androecium glabrous, the stamens arranged in two groups; those of the abaxial group 3, filaments ca. 12.3 mm, anthers oblong in outline, ca. 2.6 mm; those of the adaxial group numerous, more than 50, filaments 7-12.5 mm, anthers oblong-elliptic in outline, 0.8-1.6 mm. Gynoecium with stipe 3-4 mm, glabrous to sparsely velutinous; ovary ca. 6.5 x 4 mm, densely golden sericeous-tomentose, locule glabrous, ovules ca. 13; style lateral at ovary apex, somewhat down-curved, 1.2-1.7 mm, glabrous, except at base; stigma punctiform. Fruits unknown.
Common names: No common names have been recorded.
Distribution: Known only from two locations along tributaries of the upper Rio Negro in northwestern Amazonas, Brazil.
Ecology: Swartzia froesii has been collected in low forest "capoeira" and shrubby "caatinga" on white-sands. Nothing else is known about its ecology.
Phenology: The species has been collected in flower and bud in March and April.
Taxonomic notes: Swartzia froesii belongs to Swartzia section Unifoliolatae. It appears to be very closely related to another poorly known species from northwestern Amazonia, Swartzia monachiana, with which it shares its dense indument, relatively large bracts and short pedicels, ovary stipe, and style. The latter species, which is known only in fruit, differs from S. froesii in its less pubescent leaflets, adaxially salient midrib and apparently glabrous ovary. Both species are probably closely related to an incompletely known and as yet undescribed species from Amazonian Venezuela (Stergios & Stergios 11413) that has smaller leaflets and bracts and a more appressed, sericeous indument.
Uses: No uses have been recorded.
Etymology: The specific epithet honors R. L. Fróes, collector of the type specimen.
Conservation status: The conservation status of Swartzia froesii is unknown. As of 2011, it has been collected in only two localities, both in the under-collected and largely intact ecosystems of the expansive Território Indígena Alto Rio Negro.
Flora and Monograph Treatment(s):
Swartzia froesii R.S.Cowan: [Article] Cowan, Richard S. 1967. Swartzia (Leguminosae, Caesalpinioideae Swartzieae). Fl. Neotrop. Monogr. 1: 3-228.
Swartzia froesii R.S.Cowan: [Article] Cowan, Richard S. 1967. Swartzia (Leguminosae, Caesalpinioideae Swartzieae). Fl. Neotrop. Monogr. 1: 3-228.