Crocus flavus, known as yellow crocus or Dutch yellow crocus, is a species of flowering plant of the "Crocus" genus in the Iridaceae family.
 It grows wild on the slopes of Greece, former Yugoslavia, Bulgaria, Romania and northwestern Turkey, with fragrant bright orange-yellow flowers which Tennyson likened to a fire.
 It is a small crocus (5 - , despite the names of some cultivars, compared to the Giant Dutch crocuses ("C. vernus").
 Its cultivars are used as ornamental plants.
Crocus longiflorus, the Italian crocus, is a species of flowering plant in the genus "Crocus" of the family Iridaceae, found in Southwest Italy, Sicilia, and Malta.
Crocus sieberi, Sieber's crocus, also referred to as the Cretan crocus or snow crocus (as is "Crocus chrysanthus"), is a plant of the "Crocus" genus in the Iridaceae family.
 A small, early blooming crocus, it easily naturalises, and is marked by a brilliant orange which is mostly confined to the stamens and style, fading through the bottom third of the tepal.
 It grows wild generally in the Balkans and Greece, especially in the island Crete.
 There are four subtypes: "sieberi" (Crete), "atticus" (Attica area around Athens), "nivalis" and "sublimis".
 Its cultivars are used as ornamental plants. Height: 3 - .
Crocus kotschyanus, Kotschy's crocus, is a species of flowering plant in the genus "Crocus" of the family Iridaceae, found from Turkey to Caucasus and Lebanon.
Mucuna is a genus of around 100 accepted species of climbing lianas (vines) and shrubs of the family Fabaceae and typically found in tropical woodlands.
Ochna is a genus comprising 86 species of evergreen trees, shrubs and shrublets belonging to the family "Ochnaceae".
 These species are native to tropical woodlands of Africa, the Mascarenes and Asia.
 Species of this genus are usually called Ochnas, Bird's-eye bushes or Mickey-mouse plants, a name derived from the shape of the drupelet fruit.
 The name of this genus comes from the Greek word "Ochne", used by Homer and meaning "wild pear", as the leaves are similar in appearance.
 Some species, especially "Ochna serrulata" (bird's eye plant), are widely cultivated as decorative plants.
Crocus serotinus, the late crocus, is a species of flowering plant in the genus "Crocus" of the family Iridaceae, found in the Iberian peninsula and North Africa.
Dichorisandra thyrsiflora or blue ginger is a tropical plant which resembles ginger in growth and habit, but is actually related to the spiderworts (the genus "Tradescantia").
 The plant is native to the tropical woodlands of North, Central and South America, specially in Atlantic Forest vegetation in Brazil.
 Of the family Commelinaceae, they are cultivated for their handsome spotted stems, large shiny foliage which is held horizontally, surmounted by striking blue flowers.
Crocus etruscus (Tuscan crocus) is a species of flowering plant in the genus "Crocus" of the family Iridaceae, endemic to woodlands of Central Tuscany (Italy).
 It is a cormous perennial growing to 8 cm tall.
 The lilac flowers with purple veining and prominent orange stigmas appear in early spring.
Crocus (English plural: crocuses or croci) is a genus of flowering plants in the iris family comprising 90 species of perennials growing from corms.
 Many are cultivated for their flowers appearing in autumn, winter, or spring.
 The spice saffron is obtained from the stigmas of "Crocus sativus", an autumn-blooming species.
 Crocuses are native to woodland, scrub, and meadows from sea level to alpine tundra in central and southern Europe, North Africa and the Middle East, on the islands of the Aegean, and across Central Asia to Xinjiang Province in western China.

Question: Which genus of plants can be found in tropical woodlands, Ochna or Crocus?
Answer: Ochna