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Description


Herbs or undershurbs, aromatic. Stem quadrangular, woolly, pubescent or hirsute. Leaves opposite, elliptic-lanceolate to broadly ovate, entire to serrate, acute to acuminate. Inflorescence of dense axillary, often terminal, distant whorls. Calyx 10-nerved, often striate, mouth equal or oblique, teeth 6-10, unequal, pubescent to hirsute. Corolla upper lip erect, concave, villous, lower lip 3-fid, spreading, mid-lobe larger. Stamens 4, didynamous, ascending under upper lip, anthers connivent, cells divaricate, confluent. Disk entire or lobed, uniform or enlarged anteriorly. Styles, subulate, upper lobes minute or obsolete. Nutlets ovoid, triquetrous, obtuse.

Key to the species

Serial Key Reference
1a. Whorls 2-4 flowered; stem procumbent L. biflora
1b. Whorls 6-many flowered; stem erect or ascending 2
2a. Bracts lanceolate to elliptic, shortly awned, ciliate; calyx mouth with a ring of hairs inside L. cephalotes
2b. Bracts linear; calyx mouth with a ring of hairs inside 3
3a. Bracts pubescent, without marginal bristles L. lavandulifolia
3b. Bracts hirsuate with marginal bristles 4
4a. Bracts forming a loose involucres; calyx mouth oblique and not naked L. zeylanica
4b. Bracts forming a dense involucres; calyx mouth equal and naked L. aspera