Plant 1-2.5 m tall; stem to 10 cm long, subterranean. Leaves 6-30; sheath and petiole smooth and glabrous; sheath base 10-70 cm long, tubular, orange, fibrous; petiole 25-70 cm long. 1-1.5 mm diam., glabrous or with scarce ramenta; rachis 65-95 cm long, with a continuous white waxy layer or with sparsely brown glands; pinnae 30-72 per side, elongatelanceolate, with acute tips, regularly inserted in groups of 2-3(-4), 3-6 cm apart, spreading in different angles, in each group the apical pinnae inserted toward the apex, the basal pinnae inserted downward along the petiole, thickened at base with or without ramenta, acute apex asymmetrically split for 0.5-2.5 cm, with evident midrib adaxially, depressed abaxially, with transverse veinlets evident adaxially, light green glaucous and waxy adaxially, green to brown glaucous abaxially, with two longitudinal lines with ramenta abaxially; basal pinnae 30-45 x 0.4-0.6 cm; middle pinnae 30-50 x 0.9-2 cm; apical pinnae 8-12 x 0.2-0.5 cm. Inflorescences 58-105 cm long; peduncle 50-90 cm long, ca. 0.5 cm diam., slender, fimbriate, glabrous to scarcely covered with ramenta with papillose margins; rachilla 8-15 cm long, bearing membranous bracteoles; prophyll 30-40 cm, tubular, membranous to woody; peduncular bract 75-105 cm long, ca. 2.2 cm diam., apiculate 2.5-3.5 cm, not inflated above, woody, sulcate, green with sparse ramenta externally, muricate and brown internally; peduncular bracts 1(2), brown, scarious, apiculate, at 2 cm from apex of peduncle. Staminate flowers ca. 3 mm long, pedicel <1 mm long, inserted parallel; sepals connate basally, smooth, coriaceous. With papillose hairs on margins; petals valvate, free, muricate, coriaceous, ca. 5 x 2 mm; stamens 9-10 distally, 14-15 proximally, ca. 5 mm long, the filaments not columnar, the anthers ca. 1 mm long, slightly sagittate at both ends; pistillode simple to trifid. Pistillate flowers inserted on proximal 2-6.5 cm of rachilla, fibrous; sepals free, triangular, ca. 5 x 3 mm, imbricate to the right, glabrous with papillose hairs on margins; petals free, triangular, ca. 7 x 3 mm, contorted to the left, glabrous or with papillose hairs on margins; staminodial ring discontinuous and irregular with 5 short teeth; pistil conical , ca. 4 x 2 mm; stigma capitate or trifid to 2 mm long, glabrous. Fruit ovoid to ellipsoid , densely covered by floccose yellow-orange hairs to apex, 2-2.5 cm long, ca. 1.5 cm diam., perpendicular to rachilla, the stigmatic remnants with stigmas trifid and erect to 3 mm, the persistent perianth to ½, or near apex of fruit; seed 1. 
Allagoptera anisitsii (Barb.Rodr.) H.E.Moore
Allagoptera campestris var. orbignyi (Drude) Kuntze
Allagoptera hassleriana (Barb.Rodr.) H.E.Moore
Diplothemium anisitsii Barb.Rodr.
Diplothemium campestre var. orbignyi Drude
Diplothemium hasslerianum Barb.Rodr.
Diplothemium jangadense S.Moore
Diplothemium leucocalyx Drude
Cold Hardiness Zone (USDA) 9b
BIBLIOGRAPHY & SOURCES