Exallosperma
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Gentianales
Family: Rubiaceae
Subfamily: Ixoroideae
Tribe: Pavetteae
Genus: Exallosperma
De Block (2018)
Species:
E. longiflora
Binomial name
Exallosperma longiflora
De Block (2018)

Exallosperma longiflora is a species of flowering plant belonging to the family Rubiaceae. It is a shrub endemic to Madagascar.[1] It is the sole species in genus Exallosperma.[2]

Exallosperma longiflora is a shrub which grows up to 5 meters tall. It flowers in January and February, and fruits in April. It is known only from the northern tip of Madagascar in Sava and Diana regions. It grows in lowland dry deciduous and semi-deciduous forest on limestone, from sea level to 450 meters elevation.[3]

The genus is distinguished within tribe Pavetteae by pollen with psilate tectum, and by fruit with two stony pyrenes. Each pyrene contains a laterally flattened ovoid seed with irregularly distributed surface ridges. The ridges are formed by elongation of the outer layer (exotesta) cells.[3]

References

  1. Exallosperma longiflora De Block. Plants of the World Online. Retrieved 10 November 2023.
  2. "Exallosperma De Block | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 10 November 2023.
  3. 1 2 De Block P, Rakotonasolo F, Ntore S, Razafimandimbison SG, Janssens S (2018) Four new endemic genera of Rubiaceae (Pavetteae) from Madagascar represent multiple radiations into drylands. PhytoKeys 99: 1-66. https://doi.org/10.3897/phytokeys.99.23713
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