Staurogyne minarum (Nees) Kuntze (1891: 497)

Braz, Denise Monte & Monteiro, Reinaldo, 2017, Taxonomic Revision of Staurogyne (Nelsonioideae, Acanthaceae) in the Neotropics, Phytotaxa 296 (1), pp. 1-40 : 24-25

16. Staurogyne minarum (Nees) Kuntze (1891: 497) . Ebermaiera minarum Nees von Esenbeck (1847a: 17) . Lectotype (designated by Braz & Monteiro 2011b: 176): — BRAZIL. Minas Gerais: "jango loco", September 1841, G. Gardner 5129 (lectotype: W!; isolectotypes: BM!, E!, FI!, K!, P!, R!, RB!). ( Fig. 16 )

Shrub 1 − 2 m tall, sparsely branched, usually pilose with sparse simple trichomes, sometimes glabrescent at the base. Petiole 4 − 12 mm long; blade lanceolate to elliptic, 7 − 18.5 × 2.2 − 5 cm, apex acute to slightly acuminate, base attenuate, sometimes subobtuse, adaxially glabrous, rarely with simple trichomes, abaxially with trichomes restricted to veins. Inflorescence in lax, terminal, bracteate raceme, 8 − 15 cm long, peduncle 0.7 − 2.5 cm long; flowers opposite, rarely subopposite; rachis, bracts and bracteoles sparsely simple pilose; bracts and bracteoles green to yellow-green, bract elliptic, 5 − 15 × 3 − 7 mm, 3 acrodromous veins, sometimes 3-nerved, bracteoles elliptic to lanceolate, 4 − 8 × 1 − 2 mm. Pedicel 5 − 15 mm long; calyx yellow, sparsely pilose with simple trichomes, rarely glandular in the bud, non-ciliate, posterior segment 14 − 22 × 3.5 − 7 mm, 3 − 7-nerved, lateral pair of segments 11 − 16 × 1 − 2.5 mm, anterior pair of segments 15 − 20 × 2.4 − 4 mm; corolla yellow at the base, greenish toward the lobes, 1.7 − 3.4 cm long, basal tube 3.5 − 5 mm long, anterior lobe 2.5 − 3.2 mm long, externally pilose with scattered simple and glandular trichomes, internally glabrous; posterior stamens 1.5 − 2.1 cm long, anterior stamens 1.7 − 2.5 cmlong, staminode 2.5 − 4 mm long; ovules 18 − 22 per locule, posterior lobe of the stigma usually deeply divided, rarelly concave. Capsule 11 − 13 × 5 mm, sapersely glandular pilose.

Specimens examined:— BRAZIL. Minas Gerais:CatasAltas, Parque Natural do Caraça, 26April 2001, SanMartin- Gajardo 44 (HRCB), 3 April 1980, Tales s.n. (BHCB-1968, F), 26 July 1989, Romaniuc-Neto & Cordeiro 877 (HRCB; SP), 20 September 1997, Ferraro 5450 (CTES, MBM), 22 May 1997, Mello-Silva 1338 (SPF), 18 February 1991, Arbo et al. 5270 (CTES, SPF), 14 March 1990, Marcondes-Ferreira et al. 221 (SPF), 1816-1821, Saint-Hilaire 994 (P); Nova Lima, Mata do Jambreiro, 30 July 1990, Andrade (BHCB 19943, SPF 100243). Santa Bárbara , 8 March 1982, Hensold CFSC-2924 (SFF, HRCB), Serra do Caraça, 14 March 1993, Kameyama & Esteves 25 (HRCB, SPF), 14 March 1990, Marcondes-Ferreira et al. 221 (SPF, UEC), 27 May 1983, Pirani & Yano 697 (HRCB, SPF), 23 May 1987, Zappi & Scatena CFSC-10964 (SPF, HRCB), 11 September 1990, Freire-Fierro & Zappi 1645 (HRCB, SPF); Ouro Preto, without date, Martius 943 (M).

Distribution and habitat:— Staurogyne minarum has a restricted distribution, occurring only near the Caraça and Santa Barbara mountains, in the central portion of the State of Minas Gerais, at elevations above 700m.

Phenology:— It was collected with flowers from February to July, and fruits from July to September.

Taxonomic notes:— Staurogyne minarum is recognized by the branches and leaves generally glabrous, by the lax raceme, with bracts usually green, by the long-pedicellate flowers and specially by the glandular trichomes present only in the corolla and fruit. It was relatively common to find S. anigozanthus specimens wrongly identified as S. minarum , based on the relatively short tubular corolla, greenish-yellow, with dense trichomes, but they differ by the glabrous (not hairy) leaves, the lax (not dense) inflorescence and the bracts 3 − 7 mm broad (not 6 − 11 mm broad).

Figures

FIGURE 16. Staurogyne minarum. A.Flowering branch. B. Flower, bract and bracteoles. C. Bract. D. Bracteoles. E. Calyx. F. Anther in frontal view. G. Anther in dorsal view. H. Staminode. I. Stigma in lateral view. J. Corolla lobes (A from Zappi & Scatena CFCR-10964; B–J from San Martin-Gajardo 44).