Description from Flora of China
Pasania tubulosa Hickel & A. Camus, Ann. Sci. Nat., Bot., ser. 10, 3: 405. 1921; Cyclopasania tubulosa (Hickel & A. Camus) Nakai.
Trees ca. 15 m tall; branchlets, bud scales, and infructescences densely grayish brown tomentose. Petiole rarely to 1 cm, stout, hairy; leaf blade elliptic, 20-25 × 7-10 cm, both surfaces with simple and branched hairs but more densely so on midvein and secondary veins, base rounded, apex shortly caudate and falcate; secondary veins 12-15 on each side of midvein, abruptly curving near margin, apical ones often fusing; tertiary veins abaxially conspicuous, subparallel. Male inflorescences paniculate. Female and androgynous inflorescences 6-8 cm; rachis ca. 5 mm thick, tawny tomentose. Cupules solitary, scattered on rachis, ca. 3.5 × 2.5-3 cm, completely enclosing nut, apically abruptly narrowed and ± elongate, wall less than 1 mm thick; bracts clawlike, reflexed. Nut chestnut brown, depressed globose, 1.2-1.7 × 2-2.3 cm, with appressed minute hairs, apex shortly pointed, wall ca. 1 mm thick; scar 1-1.3 cm in diam., concave Fl. Apr-May, fr. Sep-Oct.
Mixed mesophytic forests; circa 1000 m. SE Yunnan [Laos, N Thailand, NE Vietnam]