Annona rigida

Annona rigida is a species of plant in the family Annonaceae. It is native to Brazil and Colombia.[1] Robert Elias Fries, the Swedish botanist who first formally described the species, named it after its rigid (rigidus in Latin) leaves.[2][3]

Annona rigida
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Magnoliids
Order: Magnoliales
Family: Annonaceae
Genus: Annona
Species:
A. rigida
Binomial name
Annona rigida

Description

It is a bush. Its rigid, oblong, yellow-green leaves are 12-20 by 3-5 centimeters, hairless and have pointed tips. Its solitary flowers are on thick, rigid pedicels that are 0.5-1 centimeter long with a 3-5 millimeter oval bract near their base. Its oval to triangular sepals are 4-5 millimeters long, recurved and come to a point at their tip. It has two rows of petals. The oval, wrinkled, warty outer petals are 3 by 2 centimeters. The outer petals have margins that touch but are not fused. The outer surface of the inner petals is covered in dense woolly hairs. Its stamen are 5 millimeters long. Its immature fruit are round with a diameter of 2–3.5 centimeters and covered in conical projections. Its flowers have numerous carpels.[3]

Reproductive biology

The pollen of A. rigida is shed as permanent tetrads.[4]

Distribution and habitat

It grows in the Amazon rainforest.[5]

References
  1. "Annona rigida R.E.Fr". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved July 24, 2019..
  2. Stearn, William (2004). Botanical Latin. Portland, Ore. Newton Abbot: Timber Press David & Charles. ISBN 9780881926279.
  3. Fries, Rob. E. (1957). "New Species of Annonaceae from the Upper Amazon Basin". Arkiv för Botanik (in English and Latin). 3 (18): 599–606.
  4. Walker, James W. (1971). "Pollen Morphology, Phytogeography, and Phylogeny of the Annonaceae". Contributions from the Gray Herbarium of Harvard University. 202 (202): 1–130. JSTOR 41764703.
  5. "Annona rigida R.E.Fr". Flora do Brasil 2020. Jardim Botânico do Rio de Janeiro. Retrieved July 24, 2019.


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