Paul Maas

Annickia is a genus of plant in family Annonaceae. Every species of this genus is native to continental Africa, from west Tropical Africa to Tanzania.

Costus osae is a species of flowering plant in the family Costaceae. One of many rare tropical plants in the Costus family, Costus osae is a species native to Costa Rica described in 1997 by Paul Maas and Hiltje Maas-van de Kamer. It has also been reported from Colombia. This plant has thick stems with large green fuzzy leaves. It grows to an average height of about four feet and produces thick clusters of bright red bracts. It is rare as a garden plant or houseplant in the United States and it is speculated to be hardy in zones 9–10. Costus osae is named for the Osa Peninsula of Costa Rica,

Renealmia alpinia is a flowering plant species native to the Americas, where it grows from southern Mexico through much of South America, though not in the Southern Cone. It can also be found on several Caribbean islands. In Quechua it is called misk'i p'anqa (misk'i sweet; honey, p'anqa bract, "sweet bract" or "honey bract"). The name alludes to R. alpinia's value as a culinary herb, especially for flavoring fish. Among Spanish-speakers this species is known as jenjibre-de-jardin ("garden ginger"). Both jenjibre-de-jardin and ginger (Zingiber officinale) are in the family Zingiberaceae.

Annickia chlorantha is a tree that grows up to 25 meters tall, it belongs to the Annonaceae family. An important tree used in traditional medical practices for the treatment of malaria and various diseases in Nigeria and Cameroon; oil extracted from stem barks and leaves of the species and Annickia affinis, its more common close kin have been widely studied. The species is sometimes credited by the generic name, Enantia chlorantha.

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Costus productus, known as orange tulip ginger, dwarf orange ginger, or green mountain spiral flag, is a species of plant in the Costaceae family. Costus productus is native to South Colombia and Peru. Costus productus var. strigosis is a hairy variety from southern Colombia, while Costus productus var. productus is a smooth variety from Peru. The cultivated forms of Costus productus are all C. productus var. productus, and there are several different cultivars. The flowers of Costus productus are edible. The Yanesha people use Costus productus along with Bactris gasipaes and Bromelia species

Costus curvibracteatus is a tropical rhizomatous perennial native to Costa Rica and Panama.

Costus chartaceus, commonly known as the Christmas costus, is a perennial plant with a red inflorescence first described by Paul Maas in 1972. It is native to Colombia and Ecuador but cultivated as an ornamental in other regions. It is not winter hardy. Costus chartaceus is similar in appearance to Costus prancei and Costus sprucei. Costus chartaceus is known locally as Caña agria in Spanish, Allpala-shangu in Quichua, Tentemokagi in Huaorani, Úntuntup in Achuar and Jivaro, and Virucaspi in an unidentified language.

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Triuridopsis is a genus of parasitic flowering plants in the family Triuridaceae. It has two known species, both native to western South America. Triuridopsis intermedia T.Franke, Beenken & C.Hahn - Bolivia Triuridopsis peruviana H.Maas & Maas - Peru

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Costus woodsonii, the red button ginger or scarlet spiral flag, is a species of flowering plant in the family Costaceae, native to Nicaragua, Costa Rica, Panama, and Colombia. A rhizomatous geophytic perennial, it is recommended for coastal gardens, borders, containers, and general wet, tropical garden applications. It is more widely cultivated than other species of Costus. Costus woodsonii was first described by Paul Maas in 1972 and is named for Robert Woodson of the Missouri Botanical Garden. Costus woodsonii flowers all year round. Unlike other Costaceae, Costus woodsonii can grow in

Costus montanus is a near threatened species of plant endemic to Costa Rica. It grows in moist cloud forests at middle altitudes, in the shade and along streams. Costus montanus was first described by Paul Maas in 1972. Costus montanus is sometimes confused with other Costus species such as Costus barbatus and Costus ricus.

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Guatteria ramiflora is a species of plant in the Annonaceae family. It is endemic to Peru.

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