Butia eriospatha

Butia eriospatha is a small species of Butia palm endemic to the highlands of southern Brazil. It is very similar to B. odorata, but is easily distinguished from this species by the distinct spathes which are densely covered in rust-coloured, woolly hairs. Indeed, the specific epithet is derived from Greek ἔριον, wool, and Latin spatha, which refers to the spathe. It has been given the name woolly jelly palm (UK) or wooly jelly palm (US) in English. Vernacular names for it where it is native are butiá-da-serra, butiázeiro, butiá-veludo, butiá butiá verdadeiro, butiá-do-campo, yatáy and macumá. In 1970 Sidney Fredrick Glassman moved this species, along with all other Butia, to Syagrus, but in 1979 he changed his mind and moved everything back. Butia eriospatha is a solitary-trunked palm tree. The trunk is sometimes inclined to a side, and may occasionally be subterranean. The 20-22 pinnate leaves arch back down towards the trunk and have a petiole armed with teeth spaced along their margins; the rachis of the leaf is 150–220 cm in length. The branched inflorescence develops in a woody, 115–135 cm long spathe covered in a dense woolly indumentum. The pistillate (female) flowers are 5–9mm in length. The shape of the fruit is globose (round), as is the shape of the nuts. Like all species of Butia studied, this species has relatively larger pollen grains than that of other genera of palm present in Rio Grande do Sul, Brazil. These grains are bilaterally symmetrical, prolate-spheroid, monosulcate, and with the end piriform (pear-shaped). The surface is covered in minute 2μm-large reticulate patterns. It is native to southern Brazil, where the main bulk of its population is found straddling the highlands in the eastern Santa Catarina/Rio Grande do Sul border regions, surrounded by scattered sub-populations in the southeastern coastal part of the high plateau of the states of Paraná, Rio Grande do Sul, and Santa Catarina. A naturalised population in an area of northern Misiones Province, Argentina, was reported in 2008. Bauermann et al. investigated the possibility of using palm pollen, including this species, in palynology, in order to try to provide more detail about the ancient changes in habitat in the state Rio Grande do Sul in Brazil by tracking the changes in distribution and abundance of the palms, but were unable to provide much detail on the subject. It is found growing in the Atlantic rainforest biome on a plateau at higher altitudes, between 700 and 1,200m, where it is largely found in grasslands, aggregated in often extensive, dense, almost monoculture palm groves, but higher up also sometimes in open Araucaria forest. These distinctive dense palm groves are known as butiázais in Rio Grande do Sul, but may also be known as butiatuba or butiazal.