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Morphology and Distribution 2

O. officinalis complex O. officinalis Wall ex Watt (CC)
O. minuta J.S. Presl. ex C.B. Presl. (BBCC)  O. eichingeri A. Peter (CC)
O. rhizomatis Vaughan (CC) O. punctata Kotschy ex Steud. (BB,BBCC)
O. latifolia Desv. (CCDD) O. grandiglumis (Doell) Prod. (CCDD)
O. alta Swallen (CCDD) O. australiensis Domin (EE)
   

O. officinalis complex

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This group consists of diploid and tetraploid species having genomes B, C, D, E. The D genome has not been found yet in a diploid but only in CCDD.

O. officinalis Wall ex Watt (CC)

O. officinalis
O. officinalis

O. officinalis(Thailand)
O. officinalis (Thailand)

O.officinalis growing wild
O.officinalis growing wild

Grown spontaneously in the various environments from half shaded area in a forest margin to a disturbed sunny area. Various plant heights. A tetraploid found in southern India was once described as O. malampuzhaensis, but the relation with other tetraploid species has not been known yet.

O. minuta J.S. Presl. ex C.B. Presl. (BBCC)

A small tetraploid species distributing in the Philippines and Papua New Guinea. The relation to the other tetraploid species (O. punctata) having the same genome constitution is not known. Prefers a half shaded condition.

O. eichingeri A. Peter (CC)

Related to O. officinalis and distributing in West Africa and Sri Lanka. Grown in the areas from shaded to half shaded. Sometimes the strains in Sri Lanka are called O. collina.

O. rhizomatis Vaughan (CC)

Closely related to O. officinalis but considered as a different species due to that O. rhizomatis develops rhizomes. This species has been found in an open grassland in Sri Lanka.

O. punctata Kotschy ex Steud. (BB,BBCC)

Distributed in Africa. There are two types, diploids (BB) and tetraploids (BBCC). They are growing in separate habitats, BB in an open and disturbed area while BBCC in a half shaded stable area.

O. latifolia Desv. (CCDD)

O. latifolia
O. latifolia

Natural habitat of O. latifolia
Natural habitat of O. latifolia

Widely distributed in Central and South America. It forms a related group with O. alta and O. grandiglumis which has CCDD genome in common. Grows in various environments such as a savanna, a forest margin and a fringe of cultivated land. It has been suggested that there are two types in plant height, high and low.

O. grandiglumis (Doell) Prod. (CCDD)

O. glandiglumis
O. glandiglumis

O. glandiglumis
O. glandiglumis in Amazon.

As indicated by its species name, the glumes are as long as lemmas and paleas. Wide leaf width. Distributed in the areas along of and south from the Amazon. In the Amazon district, it sometimes grows together with O. glumaepatula and elongates more than ten meters along with the increase of river water level.

O. alta Swallen (CCDD)

O. alta
O. alta

This is distinguished from O. latifolia by its large seed and wide leaf width, but these characters are expressed in continuous variation so that the relationship of the two species is not clear in many aspects.

O. australiensis Domin (EE)

A weakly perennial species distributed in the northern Australia. It is well known that this species has especially large chromosomes in Genus Oryza. Relationship with the other species in O. officinalis complex is unknown.

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