Dracocephalum truncatum Y. Z. Sun ex C. Y. Wu

Possibly only a form of Dracocephalum purdomii; some specimens from Lu-pan Shan (Gansu Province) have extremely variable middle teeth on the adaxial calyx lips.

Herbs perennial. Stems to 30 cm, sparsely retrorse floccose-pilose, nodes 2-4. Basal leaves numerous, upper leaves subsessile, gradually becoming bracts; petiole of basal leaves slender, 3-4 × as long as blade; leaf blade triangular-cordate, 2-5 × 1.5-4.5 cm, adaxially sparsely villous and finely papillate, abaxially ± purplish, sparsely villous along veins, veins conspicuous abaxially, base cordate, margin crenate, ciliolate, apex subrounded. Verticillasters in terminal capitula; bracts sessile, ovate-lanceolate to subcircular, to 1 cm, margin incised, ciliate, apex short spinescent. Calyx tubular-campanulate, slightly incurved, 1.2-1.5 cm × 4 mm, sparsely villous, ciliolate outside, glabrous inside, 5-toothed to 1/3 its length; middle tooth of upper lip trapeziform, ca. 4 × as wide as other teeth, apex ± truncate, 9-denticulate, slightly spinescent; lateral teeth of upper lip narrowly triangular; teeth of lower lip 2, lanceolate. Corolla ca. 2.5 cm, white floccose-villous; upper lip shorter than lower lip, apex 2-lobed; lower lip to 1 cm, 3-lobed, middle lobe ca. 2 × as wide as lateral lobes. Fl. Jul.

Gansu (Lintao Xian, Xiahe Xian)

* Rocky crevices in streamside banks; 2700 m.

Dracocephalum truncatum là một loài thực vật có hoa trong họ Hoa môi. Loài này được Y.Z.Sun ex C.Y.Wu mô tả khoa học đầu tiên năm 1959.

截萼毛建草（学名：Dracocephalum truncatum）为唇形科青兰属下的一个种。