Question: Which is a genus of trees and shrubs in the sunflower family endemic to the island of Saint Helena in the South Atlantic Ocean, Commidendrum or Dicentra?

Context paragraphs:
Dicentra: Dicentra (bleeding-heart; Greek "dís" "twice", "kéntron" "spur") is a genus of eight species of herbaceous plants with oddly shaped flowers and finely divided leaves, native to eastern Asia and North America.

Saint Helena: Saint Helena ( ) is a volcanic tropical island in the South Atlantic Ocean, 4,000 km east of Rio de Janeiro and 1,950 kilometres (1,210 mi) west of the Cunene River, which marks the border between Namibia and Angola in southwestern Africa.  It is part of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha.  Saint Helena measures about 16 by 8 kilometres (10 by 5 mi) and has a population of 4,534 (2016 census).  It was named after Saint Helena of Constantinople.

South-west Saint Helena Important Bird Area: The South-west Saint Helena Important Bird Area is a 45 km tract of land covering about 37% of the island of Saint Helena, a British Overseas Territory in the South Atlantic Ocean.  It has been identified by BirdLife International as an Important Bird Area (IBA) because it supports several colonies oif breeding seabirds, including the red-billed tropicbird, as well as habitat of the endemic, and critically endangered, Saint Helena plover.

Commidendrum: Commidendrum is a genus of trees and shrubs in the sunflower family endemic to the island of Saint Helena in the South Atlantic Ocean.  The vernacular name is "gumwood" or "scrubwood".

North-east Saint Helena Important Bird Area: The North-east Saint Helena Important Bird Area is a 48 km tract of land covering about 39% of the island of Saint Helena, a British Overseas Territory in the South Atlantic Ocean.  It has been identified by BirdLife International as an Important Bird Area (IBA) because it supports several colonies oif breeding seabirds, including the red-billed tropicbird, as well as much of the remaining habitat of the endemic, and critically endangered, Saint Helena plover.

Melanodendron: Melanodendron integrifolium (black cabbage tree) is one of the endemic trees in the Asteraceae family from the island of Saint Helena (South Atlantic Ocean).  It is related to the Saint Helenan gumwoods ("Commidendrum" spp.)  and is the commonest of the remaining cabbage tree species of Saint Helena, although it is considered endangered due to the restricted population size.

Commidendrum robustum: The Saint Helena gumwood (Commidendrum robustum) is a species of tree endemic to Saint Helena, Ascension and Tristan da Cunha.  Though it is now comparatively rare, it was once one of the most abundant trees of mid-elevations of the island of Saint Helena in the South Atlantic Ocean.  A small tree to 7–8 m, it was cut extensively for fuel in the early years of settlement of the island by the English East India Company.  It has given its name to certain placenames on the island such as "Gumwoods".  It is one of several species in the endemic genus "Commidendrum".

Saint Helena earwig: The Saint Helena earwig or Saint Helena giant earwig ("Labidura herculeana") was a large species of earwig endemic to the oceanic island of Saint Helena in the south Atlantic Ocean.  It is now considered extinct.

Saint Helena petrel: The Saint Helena petrel ("Pseudobulweria rupinarum"), also known as the Saint Helena gadfly petrel or large Saint Helena petrel, was a species of seabird in the family Procellariidae.  It was endemic to the island of Saint Helena in the South Atlantic Ocean.  It most likely became extinct after overpredation by people.

List of birds of Saint Helena: This is a list of the bird species recorded on Saint Helena.  The avifauna of Saint Helena Island include a total of 68 species.  Only one endemic species survives today, the Saint Helena plover.  Several more endemics are extinct and known only from subfossil remains: the Saint Helena petrel, Olson's petrel, Saint Helena shearwater, Saint Helena crake, Saint Helena swamphen, Saint Helena dove, Saint Helena cuckoo and Saint Helena hoopoe.  At least five non-endemics have been extirpated from Saint Helena but still occur elsewhere.  Nine species have been introduced by humans and formed established breeding populations while many more species were introduced in the past but failed to become established.  Of these, 43 species are rare or accidental visitors.

Supporting paragraphs: Commidendrum Dicentra
Answer: Commidendrum