Heterolamium C.Y.Wu

Harley, R.M. et al. (2004). Labiatae, in The Families and Genera of Vascular Plants (K. Kubitzki, ed. in chief) VI: 167-275. Springer-Verlag, Berlin, Heidelberg, New York.

Morphology General Habit

Slender perennial herb

Morphology Leaves

Leaves cordate, toothed, long-petiolate

Morphology Reproductive morphology Inflorescences

Inflorescence secund, of 1-3-flowered cymes, shortly pedunculate to sessile, in axils of reduced bracts, forming an elongate, terminal thyrse

Morphology Reproductive morphology Inflorescences Bracteoles

Bracteoles inconspicuous

Morphology Reproductive morphology Flowers Calyx

Calyx often purple-tinged, cylindrical to campanulate, strongly 2-lipped, 5-lobed, (3/2), posterior lip with median lobe broadly ovate, rounded at apex, slightly spreading and weakly decurrent on tube at base, lateral lobes shortly triangular-acuminate, a

Morphology Reproductive morphology Flowers Corolla

Corolla white, strongly 2-lipped, 5-lobed (4/1), posterior lip of 4 short, rounded, subequal lobes, anterior lip longer, with lobe slightly concave, rounded, tube narrowly cylindrical, straight, exserted from calyx, and abruptly expanded above, exannulate

Morphology Reproductive morphology Flowers Androecium Stamens

Stamens 4, didynamous, long-exserted, ascending under upper lip, later becoming slightly divergent, posterior pair longer at early anthesis, anterior pair apparently extending later, anthers 2-thecous, thecae elliptic, widely divaricate, confluent at apex

Morphology Reproductive morphology Flowers Gynoecium Style

Style exserted

Morphology Reproductive morphology Flowers Gynoecium Stigma

Stigma-lobes subequal, subulate, spreading

Morphology Reproductive morphology Flowers Disc

Disc 4-lobed, anterior lobe elongate

Morphology Reproductive morphology Fruits

Nutlets oblong-ovoid, smooth to finely striate, with small, elliptic areole.

Note

One species, H. debile (Hemsl.) C.Y. Wu, with several varieties

Distribution

China.