Mcvaughia bahiana

Mcvaughia is a genus in the Malpighiaceae, a family of about 75 genera of flowering plants in the order Malpighiales. Mcvaughia contains only one species, Mcvaughia bahiana, a shrub occurring in open shrubby vegetation (caatinga) on sandy soils of lowland Bahia, Brazil. It is related to Burdachia and Glandonia.

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Description. Shrubs 1 - 3 m tall. Branches densely sericeous, glabrescent at age. Stipules 2.5 - 5 mm long, adaxially glabrous, abaxially sericeous. Leaves opposite; leaf blades 4.5 - 8.8 x 2 - 5 cm, chartaceous to subcoriaceous, elliptic to obovate, base cuneate to rotund, margins plain, entire, apex acute to apiculate, adaxial side initially tomentose, glabrous at age, abaxial side densely tomentose, a pair of conspicuous glands at base abaxially, on each side of the midrib, a few inconspicuous glands scattered over the blade, with 1 - 3 glands near the apex; petiole 0.3 - 0.7 cm long, canaliculate, densely tomentose, eglandular. Thyrsi of 2 - 7 - flowered cincinni; rachis 3 - 10 cm long, smooth, densely tomentose, with brown hairs; lateral cincinni 12 - 24, subopposite; bracts 2 - 7 mm long, narrowly-triangular, appressed to the peduncle, eglandular, tomentose; peduncle 1.5 - 4.5 mm long, tomentose; bracteoles 1.5 - 2.5 mm long, narrowly triangular, opposite, appressed to the peduncle, tomentose, one of each pair bearing a conspicuous gland at base, 1 - 1.2 mm long. Flowers 1 - 1.2 cm diam. at anthesis, floral buds 3 - 3.2 mm long, pedicel 0.5 - 1.7 mm long, tomentose. Sepals 2 - 3 x 1.5 - 2.5 mm, straight, keeled, covering most of the androecium, apex acute, margin glabrous, adaxial side glabrous, abaxial side tomentose, glabrescent near the margin; 10 - glandular, glands 1.5 - 2.5 x 0.7 - 0.8 mm, yellow, elliptic. Petals yellow, both sides glabrous, soon deciduous; anterior lateral petals orbicular, cucullate, nested inside one another, limb 3 - 3.3 x 4.5 - 4.7 mm, margin denticulate, 2 - glandular at base, claws 1.2 - 1.5 x 0.2 - 0.25 mm, glabrous; posterior lateral petals obovate, spreading, limb 5.5 - 6.5 x 6 - 7 mm, margin erose, 2 - glandular at base, claws 1.8 - 2 x 0.3 - 0.35 mm, glabrous; posterior petal obovate to orbicular, erect, limb 6 - 7 x 7 - 8 mm, margin erose, 3 - 5 pairs of rounded glands at the base of limb, proximal pair larger, claws 3 - 4 x 0.7 - 0.9 mm, both sides glabrous. Stamens free at base, filaments 2 - 3 x 0.2 - 0.4 mm, cylindrical, thicker at base; connective inconspicuous, glabrous; anthers 0.7 - 1 x 0.4 - 0.45 mm; staminodes opposite the posterior-lateral sepals covered by sepals, filaments ca. 1 mm long, long-triangular, anthers ca. 0.2 mm long, oblong, locules lacking; staminode opposite the posterior petal not covered by sepals, exserted, diverging from styles, filament 2 - 2.1 x 0.2 - 0.4 mm long, anther 0.25 - 0.3 mm long, oblong, locules reduced. Ovary 1 - 1.3 x 1 - 1.3 mm, ovoid, densely sericeous; styles 3, erect, ca. 2.5 - 2.7 x 0.5 - 0.6 mm, cylindrical, parallel, glabrous, apex truncate, anterior style slightly smaller than posterior ones; stigma lateral, circular. Drupes 7 - 8.5 x 4 - 5 mm, cylindrical, slightly twisted, apex with persistent styles, sparsely tomentose, with two chambers, proximal chamber containing the seed, distal chamber containing an oily substance; seed globose, smooth. Embryo not seen.