Monographs Details: Axonopus arundinaceus G.A.Black
Authority: Maguire, Bassett & Wurdack, John J. 1957. The Botany of the Guiana Highland -- Part II. Mem. New York Bot. Gard. 9 (3): 235-392.
Family:Poaceae
Description:Latin Diagnosis - Perennis; culmi usque ad 3 m alti, erecti, rigidi, compressi, ad 7 mm lati, nodis paulum pilosis, internodiis 7-10 brevissimis com internodiis elongatis alternantibus follis cinereo-viridibus; vaginae 15-20 cm longae, 1-2 cm latae, inferiores subaequales, fortiter conduplicatae, carinatae; ligula 0.1-0.2 mm longa, integra (nostra), collo saepissime pilis longis adspersis; laminae 40-60 cm longae, 8-25 mm latae (duplicatae), lineares, rigidissimae, obtusae, conduplicatae vel ad apicem planae, scabriusculae, basi ciliatae, deciduae, apice lateribus inaequalibus, uno alterove curvato vel contorto; inflorescentiae terminales, pedunculis 2, 50-100 cm longis, triquetribus, 1-1.5 mm crassis, infra panicula scabriusculis; panicula ca. 30 cm longa, axi 6 cm longo; racemi 6-12, adscendentes, 8-21 cm longi, axillis brevissime pilosis; rhachis 0.6-0.7 mm lata, viridis, scabrida, sparse pilosa, infra pedicellos paucis pilis munita, in 25 mm 8 spiculis praedita, ad basin spiculis remotis; spiculae 3.0-3.3 mm longae, 1.3 mm latae, obtusae, ovatae; gluma lemma sterile aequans, 7 nervis prominulis, inter nervos paucis pilis adpressis praedita; flosculus spiculae longitudinem aequans, pallido-albidus vel pallido-brunneus apice minutissime pilosus obtusus.

Species Description - Perennial with stiff, scabrous, drab green foliage; culm up to 3 m tall (label), up to 7 mm thick at the base, compressed, the leaves arranged in fan-shaped clusters from groups of densely crowded nodes, the groups 10-15 cm apart; nodes 4-5, sparsely hairy or glabrescent; sheaths 15-20 cm long, 1-2 cm wide, conduplicate, strongly keeled, fused for more than one third to one half the width, often long hairy near the summit; ligule a thin white membrane, 0.1-0.2 mm long; collar a distinct transverse line, the interior of the collar glabrous; blades 40-60 cm by 8-25 mm (opened), conduplicate, keeled or opening above, ciliate along the lower margins, less commonly also above, sometimes scabrous, obtuse, the halves of the apex often unequal, the longer one recurved over the other to form a beak-like tip, deciduous; inflorescence terminal, scarcely to long-exserted from the sheath, the peduncles 2, about 50 cm long, triangular, 1-1.5 mm thick, minutely scabrous at the base of the panicle; panicle 30 cm long, the axis 6 cm long; racemes 6-12, ascending, the lower ones sometimes fasciculate, 8-21 cm long, the axils minutely hairy; rachis 0.6-0.7 mm wide, scabrous and sparsely short pilose along the margin, green, a few pedicels subtended by a few hairs, the lower half of the rachis often left naked by early deciduousness of the spikelets; spikelets 8 per 25 mm, the lower ones much more remote, 3.0-3.3 mm long, 1,3 mm wide, reddish, or purplish, obtuse, ovate; glume and sterile lemma equal, 7-nerved, or the sterile lemma sometimes 5-nerved, the nerves strong, with lines of short sparse hairs between the nerves; fertile floret equaling the spikelet in length, pale yellow or pale brown (somewhat lustrous in a few cases but never like the Suffulti), the lemma obtuse, with a few hairs at the tip.

Discussion:

TYPE: frequent, dominant herb of mountainside, stigmas reddish, to 3 m tall, montane savanna in cano, alt. 800 m, Cerro Moriche, Rio Ventuari, Amazonas, Venezuela, January 14, 1951, Bassett Maguire. R. S. Cowan, & John ). Wurdack 30883; U. S. National Herbarium No. 2,040,245.