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FOC | Family List | FOC Vol. 17 | Lamiaceae

22. Meehania Britton, Bull. Torrey Bot. Club. 21: 33. 1894.

龙头草属 long tou cao shu

Herbs annual or perennial, stoloniferous. Stems erect, nodes hairy, base sometimes woody. Leaves cordate-ovate to lanceolate, papery, margin dentate. Verticillasters few flowered, lax, in terminal or sometimes axillary racemes, sometimes 2-flowered; floral leaves leaflike, lanceolate, gradually reduced upward; bracteoles 2, small, subulate or nearly bristly. Calyx campanulate or tubular-campanulate, hairy, glabrous inside, 15-veined, dilated in fruit, 2-lipped; teeth ovate-triangular to lanceolate, 3 in upper lip, 2 in abaxial. Corolla purplish to purple, tubular, base narrower, gradually dilated to throat, not hairy annulate inside, 2-lipped; upper lip shorter, straight, apex emarginate or 2-lobed; lower lip long, 3-lobed, with middle lobe larger. Stamens 4, didynamous, included or posterior 2 slightly exserted, sometimes slightly complanate; anther cells 2, puberulent. Style slender, exserted, apex equally 2-cleft. Nutlets oblong to oblong-ovoid, glabrous.

About seven species: six in temperate to subtropical Asia, one in North America; five species in China.

1 Leaves ovate to narrowly lanceolate, base slightly cordate or cuneate.   (2)
+ Leaves cordate to ovate, base cordate, rarely truncate to rounded.   (3)
2 (1) Leaves ovate, base subtruncate to slightly cordate, 2.8-5 cm wide; inflorescence short, floral leaves different from cauline leaves   4 Meehania faberi
+ Leaves narrowly lanceolate to lanceolate, 1.2-2.5 cm wide; inflorescence long, floral leaves similar to cauline leaves   5 Meehania pinfaensis
3 (1) Verticillasters in terminal and lateral racemes; calyx tube narrowly tubular   3 Meehania henryi
+ Verticillasters in terminal racemes or 2-flowered inserted in leaf axils of upper 2 or 3 leaf pairs on stem; calyx campanulate or ± tubular.   (4)
4 (3) Calyx campanulate, inconspicuously veined, floccose-villous on veins, teeth ovate to ovate-triangular, subequal   1 Meehania urticifolia
+ Calyx narrow, ± tubular, conspicuously veined, sparsely pubescent on veins, teeth triangular to narrowly triangular   2 Meehania fargesii

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