Eriosema hatschbachii Fort.-Perez & G.P.Lewis

Fortuna-Perez, A.P., Lewis, G.P., Cândido, E.S. et al. 2013. Eriosema hatschbachii (Leguminosae, Papilionoideae), a new species from Minas Gerais, Brazil. Kew Bulletin 68: 641. https://doi.org/10.1007/s12225-013-9471-z

Type

Type: Brazil. Minas Gerais: Gouveia, Serra do Espinhaço, emdireção à Diamantina na BR-259, c. 1 km antes da UsinaEólica Experimental da CEMIG, 18 Sept. 2012 (fl.), A. P. Fortuna-Perez, Pereira, J. & Martins, C. 1401 (holotype OUPR!; isotypes K!, UEC!).

Morphology General Habit

Subshrub c. 1 m tall, stems erect from woody base, few branched at apex, with leaves only near the apex, tomentose to densely albo-tomentose

Morphology Leaves Stipules

Stipules 3 – 6 × 1.5 – 3 mm, lanceolate, mostly free, persistent on the apex of the stems, albo-tomentose

Morphology Leaves

Leaves trifoliolate, leaflets glandular-punctate; petioles 2 – 3 mm long, densely tomentose

Morphology Leaves Leaflets

Leaflets 2 – 5 × 0.5 – 1.6 cm, adaxial surface villous, abaxial surface densely albo-tomentose, obovate to elliptic (-oblong), apex rounded to acute, mucronate, base acute to cuneate, margin entire, many parallel secondary veins on the leaflets (similar to the venation seen on nearly all species of the genus Tephrosia); petiolules to 1 mm long, tomentose

Morphology Reproductive morphology Inflorescences Bracts

Bracts to 5 – 12 × 1 – 2 mm, ovate to lanceolate, adaxial surface densely albo-tomentose, abaxial surface glabrous, indumentum to 5 mm long, multi-veined

Morphology Reproductive morphology Inflorescences

Inflorescence a terminal or axillary raceme with up to 25 flowers crowded at the apex, the whole raceme (including peduncle) up to 7 cm long, densely albo-tomentose, pedicels (5 –) 8 – 12 mm long

Morphology Reproductive morphology Flowers Calyx

Calyx 5-lobed, tomentose to densely tomentose, margin ciliate, 5- to 7-veined, glandular-punctate; tube 2 – 3 mm long, the 2 vexillary lobes 5 – 6 mm long, the 3 carenal lobes 4 – 11 mm long, the central one larger (11 mm long) than the other two; corolla yellow, the standard 15 – 22 × 9 – 11 mm (excluding claw), elliptic to obovate, multi-veined, apex rounded to slightly retuse, base auriculate, auricles 0.5 – 0.8 mm long, adaxial surface villous, abaxial surface glabrous; claw 1 – 3 mm; wing petals 10 – 15 × 4 – 5 mm (excluding claw), obovate, apex rounded, glabrous, glandular-punctate, with lunate sculpturing on approximately half of the outer surface, auriculate, auricle 1 – 1.8 mm long; claw 2 – 5 mm long; keel petals 11 – 12 × 3 – 5 mm (excluding claw), falcate to obovate, apex acute to rounded, glandular-punctate, glabrous to pilose at the apex; claw 3 – 4 mm long; stamens 12 – 19 mm long, uniform; ovary pilose; the style curved, stigma minute

Morphology Reproductive morphology Fruits

Fruit brown, albo-pilose, 15 – 18 mm long, 9 – 10 mm wide, stamen tube persistent

Morphology Reproductive morphology Seeds

Seeds black, 5 mm long, 3.5 mm wide.

Distribution

Eriosema hatschbachii occurs in the municipality of Gouveia in Minas Gerais state, Brazil, and grows in campo rupestre vegetation on stony soil.

Ecology

Eriosema hatschbachii occurs in the Espinhaço Range of Brazil and was collected in “campo rupestre” (upland rocky fields) vegetation type.

Conservation

According to IUCN Red List criteria (IUCN 2001), the conservation status of Eriosema hatschbachii must be considered Data Deficient (DD) because it is known only from two collections. Until very recently there was only one known collection of this species (Hatschbach 27353 collected in 1971), but the first author returned to the same locality in September 2012 and collected the species in flower and fruit.

Phenology

Collected in flower and fruit in September.

Note

The epithet hatschbachiihonours S. GehrtHatschbach, a prolific collector of Brazilian plants for many decades. Many of his collections have been recognised as new species. The taxon is morphologically similar toEriosemafloribundumBenth. and E. pycnanthumBenth. var. pycnanthum, but is diagnosed by many parallel secondary veins on the leaflets (similar to the venation seen on nearly all species of the genus Tephrosia Pers.), erect stems with leaves only near the apex, and by its longer pedicels (8 – 12 mm long vs from sessile to 3 mm in E. pycnanthum and up to 7 mm in E. floribundum).