Floristic and taxonomic treatment of Croton subsect. Medea (Euphorbiaceae) from Brazilian campos rupestres Author Medeiros, Débora Author Valle, Luci De Senna Author Esser, Hans-Joachim Author Alves, Ruy José Válka text Phytotaxa 2016 2016-06-03 263 3 167 201 http://dx.doi.org/10.11646/phytotaxa.263.3.1 journal article 10.11646/phytotaxa.263.3.1 1179-3163 13670528 5. Croton lenheirensis Medeiros et al. (2012: 345) . Type:— BRAZIL . Minas Gerais : São João del Rei, Serra do Lenheiro, 1 km from the town, 21°09’17,84”S , 44°18’23,16”W , 1174 m elevation, 20 January 2003 (fl, fr), D. Medeiros & A.M. Werneck 234 ( holotype R 000210200!). ( Fig. 9 , A–L) Subshrubs, 0.4−1 m tall. Leaves densely congested on branch apices, not imbricate, subsessile with the petiole 1.5−2 mm long; leaf blade ovate-lanceolate, 1.6−2.3 × 0.5−0.8 cm , base acute, symmetric, margin entire, glandulose, apex acute, trichomes stellate brownish on both surfaces, apressed so on the adaxial surface, palminerved; stipules triangular, margin entire with sessile glands, 1.8−2 mm long, trichomes stellate on both surfaces, caducous. Inflorescences 1.6−4.5 cm long, with a naked sterile zone between the basal pistillate flowers and the apical staminate ones; bracts triangular-lanceolate, margin entire, 3−3.5 mm long on the staminate flower, 4−4.5 mm long on the pistillate ones, trichomes stellate on the adaxial surface. Staminate flowers 8−20 per inflorescence; pedicel 1 mm long; sepals 5, ovate-lanceolate, 2 × 1 mm , margin entire, trichomes stellate on both surfaces; petals 5, ovate-lanceolate, 1.5−2 × 0.7−1 mm , margin entire, ciliate; stamens 11, filaments 1 mm long, glabrous, brown, anthers ovoid, 0.7 mm , glabrous. Pistillate flowers 1−2 at the base of the inflorescence, pedicel 1 mm long; sepals 5, ovate-lanceolate, 5 × 1.5 mm , margin entire with sessile glands, trichomes stellate on both surfaces; petals absent; ovary globose, 2 × 2 mm , trichomes stellate sparse; styles multifid, (2−)3−4 times branched at the base, 1.5−2 mm long, glabrous. Capsules globose, 5 mm diam., trichomes stellate brownish; seeds ellipsoid, 3−4 × 2 mm . FIGURE 9 . Croton lenheirensis . A. Branch; B. Stipule; C. Inflorescence; D. Staminate flower: E. Stamen, F. Sepal (dorsal side), G. Petal (dorsal side); H. Pistillate flower: I. Sepal (dorsal side), J. Gynoecium; K. Fruit; L. Seed (dorsal and ventral sides) (after D. Medeiros 234 & A.M. Werneck (R); from Medeiros et al. 2009). Distribution:— This species is endemic to Serra do Lenheiro ( 1218 m elevation), in São João del Rei, Minas Gerais State ( Fig.10 ). FIGURE 10 . Distribution map of Croton lenheirensis . Additional specimens examined: — BRAZIL . Minas Gerais : São João del Rei , Serra do Lenheiro , 1896 (fl, fr), A. Silveira s.n. (R 158237) ; 08 July 1936 (fl), M. Barreto 4716 (R); 1194 m , 21º08’S , 44º18’W , June 2001 (fl, fr), D. Medeiros 54 (HB, R, RB); D. Medeiros 55 (HB, R, RB), D. Medeiros 56 (HB, R, RB); D. Medeiros 57 (HB, R, RB); D. Medeiros 58 (HB, R, RB); D. Medeiros 64 (HB, R, RB); D. Medeiros 66 (HB, R, RB); 20 January 2003 (fl, fr) D. Medeiros 232 & A.M. Werneck (HB, R, RB), D. Medeiros 233 & A.M. Werneck (HB, R, RB), D. Medeiros 235 & A.M. Werneck (HB, R, RB), D. Medeiros 237 & A.M. Werneck (HB, R, RB), D. Medeiros 243 & A.M. Werneck (HB, R, RB). Taxonomic notes:— Croton lenheirensis is easily distinguished from the rest of the species of subsection Medea by its triangular stipule with an entire and glandular margin and brownish indumentum.