All the 40 species produce drupe. It is also called stone fruit.

Calochortus nuttallii is an ornamental plant and has no medicinal value.

Bottle trees belong to the family Bombacaceae.

Plants of Mediterranean relict shrub family (Cneoraceae) are rich in tannin.

Acer saccharinum and Acer rubrum are the only species of maple plants which produce their fruit crop in the spring.

Twinflower is an exception as it belongs to genera Linnaea of the family Caprifoliaceae. Thus, it is the odd one out.

In the family Asclepiadoideae, it is not the colour of flowers which attracts pollinators. It is the fragrance of the flowers that attracts flies.

Genus Diervilla is an exception of general occurrence of fruits in family Caprifoliaceae. It has a capsular fruit.

Francoa of family the Francoaceae is commonly known as bridal wreaths. Francoa sonchifolia may grow up to one metre high and produce basal clumps of round, deeply lobed, dark green and fuzzy leaves with winged leafstalks.

Dicentra has flowers with two planes of symmetry. Flowers have two tiny sepals and four petals.

Comandra umbellata is characterised as a hemiparasitic plant. It just obtains water and mineral nutrients from the host plant. The host includes Acer, Antennaria, Aster, Betula, Carex, Solidago, Fragaria, Populus, Oaks, Rosa, Rubus, Vaccinium and some grasses.

Hippocastanaceae family is characterized by palmitate compound leaves. Horse-chestnuts and buckeyes belong to this family.

It is correct. Howellia aquatilis is considered to be a threatened species since 1994 because of loss of habitat. It is due to logging, draining and conversion to urban use.

Star anise is obtained from the pericarp of the fruit of Illicium verum. Star anise oil is a highly fragrant oil and is used in cooking, perfumery, soaps, toothpastes, mouthwashes and skin creams.

Both statements A and B are correct and B is the correct explanation of A. Hydrocleys nymphoides is common in water gardens and probably for this reason, it is persistent in the wilds of Florida and Texas.