Pariana radiciflora Sagot ex Döll (1877: 336)

Lopes-Neto, Raimundo Balieiro & Viana, Pedro Lage, 2022, Flora of the Serra do Cachimbo (Eastern Amazon, Brazil): Bambusoideae (Poaceae), including the description of two new species, Phytotaxa 550 (2), pp. 99-129 : 120

Pariana radiciflora Sagot ex Döll (1877: 336) .

Lectotype (designated by Tutin 1936 as type):— FRENCH GUIANA. Cayenne : Cayenne, Sagot 701 [lectotype P, isolectotypes BM, K, US-2946999 (fragment ex P)] . Syntype:— PERU. Silvis liginosis lecti, 1854, Lechler 2219a (herbarium unknown) .

Rhizomes not seen. Culms dimorphic; vegetative culms 46–49 cm tall, erect, internodes ca. 5 cm long, solid, smooth, shortly pilose to glabrescent; flowering culms 17–24 cm, erect, internodes 5–6 cm long, solid, smooth, glabrous; nodes dark brown, glabrous. Leaf sheaths shortly pilose, margins glabrous; ligules ca. 1 mm long, membranous-ciliate; auricles inconspicuous; fimbriae present, abundant, 10–18 per leaf, ca. 5 mm long; pseudopetioles ca. 2 mm long, flat, shortly pilose; blades 7.8–9 × 2.3–4.1 cm, L:W 1.1–2.1, elliptic or ovate-lanceolate, abaxially shortly pilose, adaxially glabrous, midnerve densely pubescent, asymmetrical, base rounded, margins scabridulous, apex acute; flowering culm leaves bladeless, sheath shortly pilose, margins glabrous. Synflorescences 5–7 cm long, rachis shortly pilose to glabrescent. Male spikelets ca. 5 × 3 mm, ellipsoid, dorsally compressed; pedicels ca. 2.6 mm long, shortly pubescent, densely pubescent at the base, spikelets not covering the pedicels; glumes subequal, ca. 4 × 3 mm, ovate-lanceolate, 2–3-nerved, stramineous (in siccus), shortly pilose, margins scabridulous, apex acute; lemma ca. 5 × 3 mm, elliptic, 3-nerved, stramineous (in siccus), shortly pilose, margins glabrous, apex acute; palea ca. 4 × 2 mm, elliptic, 3-nerved, stramineous (in siccus), glabrous, margins glabrous, apex acute; stamens 8, not fused, exserted, filaments ca. 2 mm long, glabrous, anthers ca. 3 mm long, yellowish (in siccus). Female spikelets 5–6 × 3–3.2 mm, ovate-triangular, laterally compressed; glumes 2, subequal, elliptic or ovate, 1-nerved, stramineous (in siccus), shortly-pilose, margins scabridulous, apex acute; anthecium ca. 6 × 3.2 mm, elliptic or ovate, stramineous (in siccus), scabridulous toward the apex, margins glabrous, apex cute; lemma 3-nerved; palea 2-nerved; lodicules not seen; staminodes absent; ovary ca. 3 mm long, elliptic, glabrous; style ca. 3 mm long, glabrous. Caryopsis not seen. Terminal spikelet ca. 7 × 3 mm, sterile and bearing an abortive male spikelet, ellipsoid, 3-nerved, stramineous (in siccus), shortly pilose, margins scabridulous, apex acute; abortive male spikelet ca. 7 × 3 mm; lower glume ca. 5 × 3 mm; upper glume 4–5 × 2.5 mm; anthecium ca. 5 × 2 mm, elliptic, stramineous (in siccus), scabridulous toward the apex, margins glabrous, apex acute; lemma 3-nerved; palea 3-nerved.

Specimens examined: — BRAZIL. Mato Grosso: Novo Mundo, Parque Estadual Cristalino, Mata alta próxima a base da serra em terreno plano. Subosque aberto, 398 m, 9°40’12”S, 55°26’17.9”W, 02 February 2008, Sasaki et al. 2148 ( HERBAM) ; Mata alta de encosta, 302 m, 09°28’0.001”S, 55°49’41.002”W, 03 June 2007, Sasaki et al. 1745 ( HERBAM) . Pará : 16 December 1956, Pires & Black 6369 ( IAN) .

Additional specimens examined: — BRAZIL. Pará : Belém, IPEAN, Resera Aurá, 02 April 1968, Pires & Silva 11530 ( IAN) .

Distribution and habitat: —This species is found in Bolivia, Brazil, Colombia, Ecuador, French Guyana, Panama, Peru, Suriname and Venezuela ( Judziewicz et al. 2000). In Brazil, it is registered in the states of Amazonas and Pará (Flora do Brasil 2020b) and this is the first record for the state of Mato Grosso. In the Serra do Cachimbo, it was found in Open ombrophilous forest.

Comments: — Pariana radiciflora and P. zingiberina Döll (1877: 377) are very similar species, sharing the dimorphic culms, the pedicels of the male spikelets densely pubescent at the base, the female spikelets with glumes subequal, elliptic, 1-nerved and a terminal spikelet ca. 7 x 3 mm, sterile and elliptic. However, P. radiciflora can be distinguished by its sheath auricles inconspicuous (vs. sheath auricles distinctly developed in P. zingiberina ), fimbriae abundant, 10–18 per leaf (vs. sparsely fimbriate, 6–7 per leaf) and blades L:W ratio = 1.1–2.1, abaxially shortly pilose, adaxially glabrous, with apex acute (vs. blades L:W ratio = 2.9–4, glabrous on both surfaces, with apex acuminate).