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Genus Andrographis in Family Acanthaceae

In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.

Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.

Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).

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Genus Description

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Andrographis (Wall. ex Nees) belongs to Acanthaceae and comprises roughly 27 species across tropical Asia from the Indian subcontinent through Southeast Asia to the Malesian archipelago (POWO, 2024; WFO, 2024). Its type species, Andrographis paniculata, defines the genus. Plants are erect annuals or short‑lived perennials, often subshrubby. Leaves are simple, opposite, exstipulate, entire‑margined, usually glabrous. Terminal spikes bear solitary, tubular, strongly bilabiate flowers with five lobes; stamens are didynamous, and the superior ovary has axile placentation. Fruit is a dehiscent, two‑lobed capsule bearing reticulate seeds (Flora of China, 2017).

Species richness peaks in the Western Ghats, Indo‑Burma region, and northern Malesia, where several taxa are locally endemic. The genus occupies lowland to hill forest margins, secondary scrub, and open, disturbed sites from sea level to roughly 1 500 m, reflecting a classic Indian‑Asian disjunction with most species in monsoon‑influenced forests and a few extending into the Sino‑Himalayas. Andrographis serpyllifolia of the Western Ghats exemplifies narrow endemism among these habitats.

Primarily bee‑pollinated, as recorded for A. paniculata (Tripp et al., 2021). Small, winged seeds disperse by wind, and a mucilaginous coat allows occasional water transport. Chromosome counts for cultivated A. paniculata give 2n = 28, indicating a base number x = 14 (Sultana et al., 2015).

Molecular phylogenies confirm the monophyly of Andrographis and its placement in tribe Andrographideae, sister to a clade containing Justicia and Ruellia (Tripp et al., 2021). Historical segregations such as Haplanthoides have been synonymised under Andrographis (POWO, 2024). No formal subgeneric sections are universally accepted, although informal groups based on leaf morphology have been proposed in recent floristic treatments. Some authors have occasionally assigned A. ovata to Graptophyllum, a placement that remains contentious in the broader Acanthaceae system. Species limits in Malesia remain incompletely resolved, suggesting ongoing taxonomic refinement.

Andrographis species are cultivated as ornamental herbs for their delicate foliage and modest inflorescences, and their bitter leaves occasionally feature in regional non‑medicinal culinary preparations. No species are harvested for timber, and none are major invasive weeds, although some taxa can naturalise in agricultural margins.

Habitat loss from deforestation and agricultural conversion threatens several narrow endemics, while A. paniculata remains common. Conservation actions include ex situ seed banking and protecting forest fragments that host regional endemics. Continued integrative research that couples genomics with detailed field ecology will be essential for preserving Andrographis diversity.

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