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| Stachytarpheta atkinsiae Harley & Giul.
in Harley, Antar & Giulietti, 2019.
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Abstract
Stachytarpheta atkinsiae, belonging to the Radlkoferiana group from the Chapada Diamantina, Bahia state Brazil, is here described. It is a red-flowered species, and unusual in being a large, much-branched shrub, with densely lanate indumentum. The species shows similarities with S. froesii and S. radlkoferiana, but differs from both vegetative and floral characters. We provide a full description of the species, together with illustrations, a conservation status assessment, and a distribution map.
Keywords: “campo rupestre”, endemic species, Serra do Espinhaço, taxonomy
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| FIGURE 1. Stachytarpheta atkinsiae. a. Habit. b. Leaf, adaxial surface. c. Leaf, abaxial surface. d. Leaf, detail of revolute margin. e. Inflorescence. f. Flower, including calyx, corolla, bract. g. Corolla tube detail with gland-tipped trichomes. h. Bract, adaxial surface. i. Calyx lobe, internal surface. j. Dissected corolla. k. Detail of the trichome of corolla. l. Anther. m. Style apex with capitate stigma. All from Harley et al. 55488 (type).
Drawn by João Silveira.
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| Figure 2. Stachytarpheta atkinsiae. A. Branch with flowers. B. Habit. C. Habitat.
Photos by Raymond M. Harley.
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Stachytarpheta atkinsiae Harley & Giul. sp. nov.
Type:— BRAZIL. Bahia: Mucugê, Serra do Gobira, ca. 8,4 km ao sul de Mucugê em linha reta, na última subida próxima ao cume, ...., 1555 m. Campo rupestre entre pedras, 19 January 2005, R.M. Harley, A.M. Giulietti & E. Ribeiro 55488 (holotype HUEFS; Isotypes K, MG, SPF).
Stachytarpheta atkinsiae is morphologically similar to S. froesii Moldenke, S. radlkoferiana Mansfeld var. radlkoferiana and S. radlkoferiana var. lanata S.Atkins. All taxa are red-flowered and those species are the only ones to share with S. atkinsiae the discolorous leaves, ± glabrous on adaxial surface and white-lanate on abaxial surface and with a revolute margin. S. atkinsiae has leaves sessile or with petiole up to 2 mm long, lamina 2.0–3.7 × 1.0–2.3 cm, elliptic, apex obtuse; bracts linear, 10–12.5 mm long; base of flowers obscured by lanate indumentum. S. froesii differs from the new species as follows: it has leaves with petiole 5–8 mm long, lamina 1.5–2.8 × 1.4–2.5 cm, broadly obovate, apex rotund to truncate, base of flowers not obscured by lanate indumentum and especially because the bracts which are linear as in S. atkinsiae, measure only c. 4 mm long. S. radlkoferiana var. radlkoferiana and var. lanata differ from the new species as both possess obovate and not linear bracts, as well as having much smaller, sessile leaves. S. radlkoferiana var. radlkoferiana has imbricate leaves on the young shoots, 0.7–1.5 × 0.4–0.8 cm., linear-elliptic to long-triangular or narrowly oblong, while S. radlkoferiana var. lanata has ovate leaves, which measure 1.0–1.4 × 0.5–0.7 cm.
Type:— BRAZIL. Bahia: Mucugê, Serra do Gobira, ca. 8,4 km ao sul de Mucugê em linha reta, na última subida próxima ao cume, ...., 1555 m. Campo rupestre entre pedras, 19 January 2005, R.M. Harley, A.M. Giulietti & E. Ribeiro 55488 (holotype HUEFS; Isotypes K, MG, SPF).
Stachytarpheta atkinsiae is morphologically similar to S. froesii Moldenke, S. radlkoferiana Mansfeld var. radlkoferiana and S. radlkoferiana var. lanata S.Atkins. All taxa are red-flowered and those species are the only ones to share with S. atkinsiae the discolorous leaves, ± glabrous on adaxial surface and white-lanate on abaxial surface and with a revolute margin. S. atkinsiae has leaves sessile or with petiole up to 2 mm long, lamina 2.0–3.7 × 1.0–2.3 cm, elliptic, apex obtuse; bracts linear, 10–12.5 mm long; base of flowers obscured by lanate indumentum. S. froesii differs from the new species as follows: it has leaves with petiole 5–8 mm long, lamina 1.5–2.8 × 1.4–2.5 cm, broadly obovate, apex rotund to truncate, base of flowers not obscured by lanate indumentum and especially because the bracts which are linear as in S. atkinsiae, measure only c. 4 mm long. S. radlkoferiana var. radlkoferiana and var. lanata differ from the new species as both possess obovate and not linear bracts, as well as having much smaller, sessile leaves. S. radlkoferiana var. radlkoferiana has imbricate leaves on the young shoots, 0.7–1.5 × 0.4–0.8 cm., linear-elliptic to long-triangular or narrowly oblong, while S. radlkoferiana var. lanata has ovate leaves, which measure 1.0–1.4 × 0.5–0.7 cm.
Distribution and ecology:— S. atkinsiae is known only from the Serra do Gobira, in the municipality of Mucugê, in Bahia (Map 1). The species occurs only in campo rupestre vegetation in sandy rocky dry soils. It is recorded from high elevation areas (1400 to 1570 m) in campo rupestre vegetation, in sandy rocky dry soils. Flowers and fruits were registered in September and January (most collections in this month).
Etymology:— The specific epithet honors Sandy Atkins who worked at the Royal Botanic Gardens, Kew. Sandy Atkins is the author of the revision of Stachytarpheta in Brazil (Atkins 2005), a superb work that is currently the most up-to-date and important contribution to our knowledge of the genus.
Raymond M. Harley, Guilherme Medeiros Antar and Ana Maria Giulietti. 2019. Stachytarpheta atkinsiae, A New Species of Verbenaceae endemic to the Chapada Diamantina, Bahia, Brazil. Phytotaxa. 401(2); 127–132. DOI: 10.11646/phytotaxa.401.2.4
Resumo: Nesse trabalho está sendo descrita Stachytarpheta atkinsiae pertencente ao Grupo Radlkoferiana e de ocorrência na Chapada Diamantina, Bahia, Brasil. É uma espécie vistosa, com flores vermelhas, e bem distinta por ser um arbusto alto, robusto e ramificado, com ramos densamente lanados. A espécie tem semelhanças com S. froesii e com S. radlkoferiana, mas difere por caracteres vegetativos e florais. É apresentada descrição detalhada, ilustrações, fotos em campo, análise do estado de conservação, e mapa de distribuição.
Etymology:— The specific epithet honors Sandy Atkins who worked at the Royal Botanic Gardens, Kew. Sandy Atkins is the author of the revision of Stachytarpheta in Brazil (Atkins 2005), a superb work that is currently the most up-to-date and important contribution to our knowledge of the genus.
Raymond M. Harley, Guilherme Medeiros Antar and Ana Maria Giulietti. 2019. Stachytarpheta atkinsiae, A New Species of Verbenaceae endemic to the Chapada Diamantina, Bahia, Brazil. Phytotaxa. 401(2); 127–132. DOI: 10.11646/phytotaxa.401.2.4
Resumo: Nesse trabalho está sendo descrita Stachytarpheta atkinsiae pertencente ao Grupo Radlkoferiana e de ocorrência na Chapada Diamantina, Bahia, Brasil. É uma espécie vistosa, com flores vermelhas, e bem distinta por ser um arbusto alto, robusto e ramificado, com ramos densamente lanados. A espécie tem semelhanças com S. froesii e com S. radlkoferiana, mas difere por caracteres vegetativos e florais. É apresentada descrição detalhada, ilustrações, fotos em campo, análise do estado de conservação, e mapa de distribuição.
