What type of vegetation does Citharexylum and Cuminum have in common?
Citharexylum Citharexylum is a genus of flowering plants in the verbena family, Verbenaceae. It contains shrub and tree species commonly known as fiddlewoods or zitherwoods. They are native to the Americas, ranging from southern Florida and Texas in the United States to Argentina. The highest diversity occurs in Mexico and the Andes. The generic name is derived from the Greek words κιθάρα ("kithara"), meaning "lyre", and ξύλον ("xylon"), meaning "wood," referring to the use of the wood in the sounding boards of string instruments. Several species, especially "C. caudatum" and "C. spinosum", are cultivated as ornamentals.
Trichopus zeylanicus Trichopus zeylanicus is a small herbaceous plant, which is one of only two species of its genus, "Trichopus". Formerly it was placed in its own family, Trichopodaceae, but is now included in the Dioscoreaceae family. The leaves are about 20 cm long and grow from a rhizome. The shape of the leaves can be highly variable even within one location, but the most common shape is cordate. The herb grows on sandy soil near rivers and streams in shady places in lowland and intermediate altitude forests. It flowers year long and the fruits are thought to be dispersed by water. The unusual flowers are purplish black.