Question: Which plant genus includes more species, Hedychium or Malephora?

Context paragraphs:
Geissois: Geissois is a genus of trees and shrubs in the plant family Cunoniaceae.  It includes about 19 species mostly found in New Caledonia, but also in Fiji, Vanuatu, and the Solomon Islands.  Leaves are opposite, palmate with 3-9 leaflets, with entire margin (serrate in "Geissois hirsuta" and juveniles) and intrapetiolar stipules.  The inflorescences are simple racemes (trident in "Geissois hirsuta") and bottle-brush like.  The flowers have four red sepals, lacking petals, with many long red stamens.  The fruit is a capsule, the seeds flat and winged.  The genus includes several nickel hyperaccumulator (most species occurring on ultramafic rocks) and one aluminum hyperaccumulator, "Geissois polyphylla".

Carpenter bee: Carpenter bees are species in the genus Xylocopa of the subfamily Xylocopinae.  The genus includes some 500 species in 31 subgenera.  The common name "carpenter bee" derives from their nesting behavior; nearly all species burrow into hard plant material such as dead wood or bamboo.  The main exceptions are species in the subgenus "Proxylocopa"; they dig nesting tunnels in suitable soil.

Banksia sessilis: Banksia sessilis, commonly known as parrot bush, is a species of shrub or tree in the plant genus "Banksia" in the family Proteaceae.  It had been known as Dryandra sessilis until 2007, when the genus "Dryandra" was sunk into "Banksia".  The Noongar peoples know the plant as Budjan or Butyak.  Widespread throughout southwest Western Australia, it is found on sandy soils over laterite or limestone, often as an understorey plant in open forest, woodland or shrubland.  Encountered as a shrub or small tree up to 6 m in height, it has prickly dark green leaves and dome-shaped cream-yellow flowerheads.  Flowering from winter through to late spring, it provides a key source of food—both the nectar and the insects it attracts—for honeyeaters in the cooler months, and species diversity is reduced in areas where there is little or no parrot bush occurring.  Several species of honeyeater, some species of native bee, and the European honey bee seek out and consume the nectar, while the long-billed black cockatoo and Australian ringneck eat the seed.  The life cycle of "Banksia sessilis" is adapted to regular bushfires.  Killed by fire and regenerating by seed afterwards, each shrub generally produces many flowerheads and a massive amount of seed.  It can recolonise disturbed areas, and may grow in thickets.

Thraupis: Thraupis is a genus of birds of the tanager family occurring from Mexico to Argentina.  Some are familiar species with large ranges.  As currently defined the genus includes 9 species, but this includes species from two separate clades. Consequently, the genus is paraphyletic and two species ("T. cyanocephala" and "T. bonariensis") are likely to eventually be moved to another genus.

Hedychium: Hedychium is a genus of flowering plants in the ginger family Zingiberaceae, native to lightly wooded habitats in Asia.  There are approximately 70-80 known species, native to Southeast Asia (Thailand, Malaysia, Indonesia, the Philippines, etc.), southern China, the Himalayas and Madagascar.  Some species have become widely naturalized in other lands (South Africa, South America, Central America, the West Indies, and many of the islands of the Pacific, Indian and Atlantic Oceans) and considered invasive in some places.

Malephora: Malephora is a genus of succulent plants in the ice plant family.  There are 13 to 17 species in the genus, many of which are known commonly as mesembs.  They are native to Africa.

Labidochromis: Labidochromis is a genus of cichlid fishes that are endemic to Lake Malawi in East Africa.  The genus includes 18 formally described species, and several yet undescribed species.  It includes a number of species commonly kept in cichlid aquariums such as "L. caeruleus" (electric yellow).  The species in this genus can easily hybridize, so if kept in an aquarium it is recommended to only have one species from this genus.

Hebe (plant): Hebe is a genus of plants native to New Zealand, Rapa in French Polynesia, the Falkland Islands, and South America.  It includes about 90 species and is the largest plant genus in New Zealand.  Apart from "H. rapensis" (endemic to Rapa), all species occur in New Zealand.  This includes the two species, "H. salicifolia" and "H. elliptica", that have distributions extending to South America.  The genus is named after the Greek goddess of youth, Hebe.

Linnaea: Linnaea is a plant genus which has often been classified in the family Caprifoliaceae (the Honeysuckle family) but may be more accurately considered to belong to its own family, Linnaeaceae.  The genus includes a single, generally boreal to subarctic woodland subshrub species, Linnaea borealis, commonly known as twinflower (sometimes written twin flower).

Caryodendron: Caryodendron is a plant genus of the family Euphorbiaceae first described as a genus in 1860.  The genus includes "C. orinocense", known as the Inchi tree or Tacay nut.  It is native to Central America and South America.

Supporting paragraphs: Hedychium Malephora
Answer: Hedychium