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Genus Castilla in Family Moraceae

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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Castilla (Cerv.) is a small Neotropical genus of the Moraceae positioned in the tribe Moreae, with about two recognized species and a type species, Castilla elastica Cerv. (WFO, 2024; WCVP, 2024). It ranges across lowland to lower montane tropical forests from southern Mexico through Central America into northern South America, occurring in wet and seasonal forests and secondary growth from sea level to roughly 1200 meters (GBIF, 2024). The genus consists of dioecious, medium-sized trees that exude abundant white latex when cut. Leaves are simple, alternate, and palmately veined with a sandpapery upper surface; stipules are caducous. Infloresences are axillary, pedunculate, unisexual, and form compact, “capitate” heads (or reduced panicles) subtended by large, persistent bracts, the female heads often becoming larger and more conspicuous (Berg, 2001). Flowers are minute; the perianth is absent; pistillate flowers have a usually 4–5-lobed, fleshy calyx and a superior ovary with one ovule per flower. Fruits are drupes embedded in an accrescent, fleshy inflorescence that becomes orange-brown at maturity (Berg, 2001).

Diversity centers on Central America, with some Amazonian populations referred to the closely allied Castilla ulei (C.C.H. Berg, 2001). The genus is characteristic of early-successional habitats and is wind- or gap-driven in regeneration, often forming dense stands after disturbance (Hu et al., 2022). Dispersal is largely endozoochorous by birds and mammals attracted to the sweet, fleshy infructescences; pollination appears to be wind-mediated, consistent with other Moreae, though detailed field studies are few (Berg, 2001). Consistent chromosome counts are sparse; the most frequently reported base number for the tribe Moreae is x=14, but specific counts for Castilla are not well documented and should be treated cautiously (Schäferhoff et al., 2010; Datwyler and Weiblen, 2004).

Taxonomically, Castilla has long been treated as narrowly circumscribed around C. elastica, with many previously included taxa transferred to Castilla sect. Croizatia (Croazatia Desr.) as Croazatia (Berg et al., 2005). WFO and WCVP currently accept C. elastica and C. ulei as the principal species within Castilla sensu stricto (WFO, 2024; WCVP, 2024), while the broader “Castilla” group of traditional taxonomy, including Croazatia, is sometimes maintained in broader treatments (Berg, 2001). Regional floras retain this narrower circumscription for Castilla, leading to stable species delimitation in Central America but ongoing revision in South America.

Humans have cultivated C. elastica for its latex and as an ornamental in tropical landscaping; it has been widely introduced to Southeast Asia and the Pacific for shade and reforestation (Hu et al., 2022). It naturalizes locally but remains non-invasive in most regions and is of minimal weed concern (GBIF, 2024). Data on conservation status are sparse, though deforestation and habitat fragmentation threaten local populations. Integrating molecular, morphological, and ecological data will improve species boundaries and clarify historical introductions and climatic tolerances (WFO, 2024; WCVP, 2024).

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