Siderasis albofasciata (Pellegrini, Marco O. O. & Faden, Robert B. 2017)
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Ordo: Commelinales
Familia: Commelinaceae
Genus: Siderasis
Name
Siderasis albofasciata M. Pell., Nordic J. Bot. 35 (1): 30. 2017. – Wikispecies link – Pensoft Profile
- Siderasis albofasciata Pellegrini, Marco O. O., 2017, PhytoKeys 83: 14-15.
Materials Examined
Type. BRAZIL. Espirito Santo: Santa Teresa, Alto do Juliao, Fazenda Novo Triunfo, property of Mrs. Florinda, gallery forest with rocky formations, above the dam, fl., fr., 18 Apr 2013, M.O.O. Pellegrini et al. 337 (holotype: RB barcode RB00813532!; isotype: US!).
Description
Description. Herbs ca. 10 cm tall, rhizomatous, terrestrial or rupicolous. Roots with terminal tubers present. Rhizomes buried deep in the ground. Subterraneous stems with internodes moderately elongate, vinaceous, sparsely lanate, hairs light brown to hyaline. Aerial stems short to inconspicuous, unbranched; internodes inconspicuous to weakly elongate, vinaceous, lanate, hairs light brown to hyaline; flagelliform-shoots (ramets) present. Leaves spirally-alternate, forming a rosette at the apex of the aerial stems, sessile to subpetiolate; sheaths 0.7-1.3 cm long, vinaceous, with or without green spots, lanate, hairs light brown to rusty; subpetiole 1-2.7 cm long to inconspicuous, D-shaped in cross section, canaliculate, dark green to vinaceous, hispid, hairs light brown to hyaline; blade (4.5-4.8-)10-15.8 x (3.1-3.5-)4.4-7.2 cm, elliptic to obovate, rarely lanceolate, succulent, adaxially dark green, with a thin white stripe along the midvein, hispid, hairs light brown to hyaline, abaxially vinaceous to atro-vinaceous, lanate, hairs light brown, base slightly subcordate to cuneate, vinaceous, margins vinaceous, slightly revolute, apex acute, straight to curved downwards; midvein adaxially inconspicuous, slightly impressed, abaxially prominent, obtuse, secondary veins 3-5, inconspicuous in both faces, becoming more evident when dry. Synflorescence composed of a solitary main florescence with 1-2 coflorescences. Main florescence (inflorescence) reduced to a solitary pedunculate cincinnus, terminal or apparently so; basal bract 11.3-13.4 x 4.8-7.8 mm, triangular, slightly cymbiform, amplexicaulous, vinaceous, hispid, hairs rusty, opaque at the base and margins; inflorescence main axis 2.1-4.4 cm long, vinaceous, densely hispid, hairs rusty to brown; cincinni bract 3.3-6 x 2.2-4.6 mm, triangular, amplexicaulous, vinaceous, hispid, hairs rusty; cincinni (3-)5-8-flowered, peduncles 0.8-1.6 cm long, vinaceous, densely hispid, hairs rusty to brown, reflexed in fruit; bracteoles 2.9-4.4 x 2.8-3.2 mm, broadly ovate to depressed ovate, sessile, revolute, vinaceous to pinkish purple, sparsely hispid, hairs rusty, apex rounded to truncate. Flowers bisexual, actinomorphic, 2.3-2.8 cm diameter, pedicellate; pedicel 1-7.2 mm long, white to light green, hispid, hairs rusty, reflexed and slightly elongate in fruit; floral buds 0.7-1.6 x 0.3-0.6 cm, ellipsoid to narrowly obovoid, light green, apex obtuse; sepals 0.9-1.1 x 0.4-0.7 cm, narrowly ovate to elliptic, membranous, white to light green on both sides, externally sparsely hispid, hairs hyaline to rusty, rusty in fruit, internally glabrous, margin hyaline, apex obtuse, slightly purple; petals 1.3-1.6 x 1-1.2 cm, broadly ovate to broadly elliptic, bluish lilac to bluish purple, proximal third white, base cuneate, margin entire, apex obtuse to rounded, sometimes irregularly lacerated; stamens equal, filaments 5-7.1 mm long, straight, white, terminal third purple to bluish purple, anthers 1.5-2.2 x 1.3-2 mm, anther sacs purple to bluish purple, connectives quadrangular, purple; ovary 1.5-2 x 1.5-2 mm, globose, white, densely hispid, hairs hyaline, style 4.1-6.3 mm long, straight, white, terminal third purple to bluish purple; stigma annular-truncate, purple to bluish purple, papillate. Capsules 1-1.3 x 0.7-0.9 cm, subglobose to broadly oblongoid in outline, smooth, green, when mature light brown, hispid, hairs rusty. Seeds 3.3-5.2 x 2.4-2.9 mm, obconic to ellipsoid, medium to dark brown, testa rugose; hilum approximately 1/2 the length of the seed; embryotega semilateral; aril cream-colored, slightly translucent, thick.
Etymology
Etymology. The epithet means "white-striped", making reference to the thin and always present, white to silver stripe along the midvein of this species' leaves.
Distribution
Distribution and habitat. Siderasis albofasciata is known exclusively from the municipalities of Santa Teresa and Fundao, state of Espirito Santo (Fig. 2). It occurs in the understory of evergreen forests, in shady areas with shallow and rocky soil, with great leaf-litter accumulation.
Taxon Treatment
- Pellegrini, Marco O. O.; Faden, Robert B.; 2017: Recircumscription and taxonomic revision of Siderasis, with comments on the systematics of subtribe Dichorisandrinae (Commelinaceae), PhytoKeys 83: 14-15. doi
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