PlantaeDB Logo
Login Sign-up

Genus Schiedea in Tribe Sclerantheae

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).

Do you wish to read more about plant taxonomy? Click here!

Genus Description

Suggest a correction!

Schiedea (Cham. & Schltdl.) is a Hawaiian‑endemic genus in the family Caryophyllaceae. Current checklists record roughly thirty species, the majority confined to single islands; a few have broader island distributions (POWO, 2024; WFO, 2024). The type species is Schiedea diffusa Cham. & Schltdl., the name used at the genus’ original description.

Morphologically Schiedea ranges from herbaceous perennials to shrubs. Leaves are opposite, simple, entire, and bear minute stipules. The inflorescence is typically a terminal panicle, occasionally reduced to a solitary flower. Flowers are actinomorphic with five sepals and five petals (the latter may be reduced), a superior ovary with a free‑central placenta, and the fruit is a many‑seeded capsule opening by valves. This combination of opposite leaves, distinct stipules and a free‑central ovary distinguishes the genus within Hawaiian Caryophyllaceae.

The greatest species concentration occurs on Maui and Oahu, where many taxa are confined to coastal cliffs, dry shrubland or wet forest from sea level to about 1,600 m. Most species are island‑endemic, reflecting a classic island‑radiation pattern with frequent inter‑island dispersal followed by in‑situ speciation.

Sexual systems range from hermaphroditic to functionally dioecious; several lineages have evolved unisexual flowers. Observed pollinators include bees, moths and flies, while some small‑flowered taxa appear wind‑assisted. Capsules dehisce at maturity, releasing minute seeds that are probably gravity‑dispersed, although some have small arils possibly attractive to ants.

Taxonomy recognises two subgenera—Schiedea subg. Schiedea (herbaceous, perfect flowers) and Schiedea subg. Euschiedea (woody, often unisexual) (Wagner et al., 1999). Phylogenomics recovers four clades matching habit, sexuality, island distribution, leading authors to treat them as sections Schiedea, Euschiedea, Fasciculatae and Punctata (Keller et al., 2021). APG‑IV, 2016 places the genus in subfamily Alsinoideae, but tribal placement remains unsettled; evidence supports both tribe Sileneae and a Hawaiian‑endemic tribe (Harbaugh et al., 2010).

Schiedea has no commercial crop status; a few species are cultivated in botanical gardens for ornamental foliage and flowers. Their horticultural value lies chiefly in restoration plantings that aim to re‑establish native communities; timber, fibre or food uses are not recorded.

Many taxa are listed as endangered or critically endangered by the IUCN, largely due to habitat loss, invasive weeds, herbivory and climate change (WFO, 2024). Ongoing seed‑banking and propagation programs aim to safeguard remaining diversity, but comprehensive phylogenomic and ecological research is needed to guide future restoration.

Pick a Species to see its components: