William Surprison Alverson

Quararibea aurantiocalyx is a species of flowering plant in the family Malvaceae. It is a tree native to eastern Costa Rica and central Panama. It is a small to medium sized tree which grows 5 to 25 meters tall and flowers in March. It grows in humid submontane rain forest and cloud forest from 1,100 to 1,200 meters elevation. The species is rare and known from only two separated locations, and the IUCN Red List assesses the species as Critically Endangered.

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Quararibea santaritensis is a species of flowering plant in the family Malvaceae. It is found only in Panama.

Quararibea pendula is a species of flowering plant in the family Malvaceae. It is a tree native to eastern Costa Rica and western Panama. It is a shrub to small tree which grows 3 to 8 meters tall. It flowers in April, June, and October to December, and fruits in July. It is native to Atlantic lowland rain forest, where it grows in the forest understory or in riparian areas from 50 to 200 meters elevation. It is threatened by habitat loss, and the IUCN Red List assesses the species as Endangered. The species was first described by William Surprison Alverson in 1989.

Quararibea gomeziana is a species of flowering plant in the family Malvaceae. It is a tree native to eastern Costa Rica and western Panama. It is a large shrub or small tree, growing 5 to 12 meters tall. It flowers in January, March to May, and October, and fruits in February, May, and October. It grows in Atlantic lowland rain forest, mostly in Costa Rica, from 10 to 300 meters elevation. It is threatened by habitat loss, and the IUCN Red List assesses the species as Vulnerable. The species was first described by William Surprison Alverson in 1989.

Matisia exalata is a species of flowering plant in the family Malvaceae sensu lato or Bombacaceae. It is a tree found only in Panama. It is threatened by habitat loss.

Matisia dolichosiphon is a species of flowering plant in the Malvaceae family. It is a tree found only in Panama. It was first published as Quararibea dolichosiphon in Bull. Jard. Bot. Natl. Belg. 40: 353 (1970) by A.Robyns & S.Nilsson. In 1989 William Surprison Alverson placed the species in the genus Matisia as Matisia dolichosiphon.

Matisia palenquiana is a species of flowering plant in the family Malvaceae sensu lato or Bombacaceae. It is found only in Ecuador. Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montane forests. It is threatened by habitat loss.

Spirotheca rosea is a species of tree in the family Malvaceae. It is found from Costa Rica to Bolivia. It is threatened by habitat loss.

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