PlantaeDB Logo
Login Sign-up

Genus Zephyranthes in Family Amaryllidaceae

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!

Zephyranthes Herb. belongs to Amaryllidaceae subfamily Amaryllidoideae tribe Hippeastreae, which has been widely supported by recent molecular work (Apg IV, 2016; Meerow et al., 2014). The genus comprises about 70–100 species of perennial, bulbous herbs distributed across the tropical and subtropical Americas, with a concentration of diversity in South America and the Caribbean; a small number extend into the southern United States. Floral biology is linked to rainfall and several species have become familiar ornamentals, notably the hurricane or rain lily, which commonly blooms following storms.

Plants bear tunicated bulbs and linear, often glossy, erect to recurving leaves that usually appear with or after the flowers. Scapes are leafless and usually solitary; bracteoles are fused into a tubular spathe that encloses the bud. Flowers are actinomorphic, with six tepals that form a funnel or trumpet; filaments are short and inserted at the tube base, anthers are dorsifixed, and the style bears a trifid stigma. The ovary is inferior with axile placentation and many ovules. The fruit is a loculicidal capsule, and seeds are black, flattened, and winged, reflecting the typical Amaryllidaceae dispersal syndrome.

Diversity is highest in South America, especially in Brazil and adjacent regions, and in the Caribbean; several species are island endemics. Habitats range from lowland grasslands, savannas, and scrub to montane grasslands and roadsides, with many taxa exploiting seasonally wet or fire-prone sites. Floral biology in a subset of species suggests bee visitation (Hutchinson, 1954), though detailed pollination studies remain sparse. Chromosome numbers vary widely, with base numbers x=6, 7, and 8 reported (Meerow et al., 2000).

Historically, Zephyranthes has been conflated with genera such as Habranthus and Haylockia, and typification has differed among treatments (Traub, 1958; Hutchinson, 1954; APG IV, 2016). Molecular evidence supports Zephyranthes as a monophyletic group that is sister to the Habranthus alliance, but ongoing work is refining internal relationships and refining the circumscription of closely allied lineages (Meerow et al., 2014; Meerow et al., 2000). Many species are cultivated for showy flowers and ready bloom cycles, and a few weedy taxa have become naturalized outside their native ranges. Conservation assessments are uneven; island taxa appear particularly vulnerable to habitat loss. More integrative phylogenetic and biogeographic studies are needed to clarify species limits and evolutionary history (Meerow et al., 2014).

Pick a Species to see its components: