Plants terrestrial. Stem erect or ascending, up to 8 cm, ca. 1.5 mm in diam. at middle, together with leaves 0.5-1 cm wide, 2 or 3 times dichotomously branched, upper portion often with bulbils. Leaves dense, reflexed, angled upward and amplexicaul, lustrous, lanceolate, slightly contracted toward base, straight, 4-7 × ca. 1 mm, thinly papery, both surfaces glabrous, midrib distinct abaxially, indistinct adaxially, base cuneate, decurrent, sessile, margin straight and not crispate, distal margins with sparse teeth, apex acute or acuminate. Sporophylls homomorphic with trophophylls; sporangia visible because of reflexed sporophylls, yellowish, reniform.

Huperzia lajouensis was classified into H. sect. Huperzia by Ching (Acta Bot. Yunnan. 3: 305. 1981). In fact, the distal portion of the leaves of this species is sparsely denticulate. This also distinguishes this species from H. tibetica.

● Wetlands; 3400-4000 m. Xizang (Zayü).