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DELTA sample data

M. J. Dallwitz and L. Watson

Oryza L.

Including Padia Moritzi

Habit, vegetative morphology. Annual, or perennial. Culms 30–300 cm high; herbaceous. Culm nodes glabrous. Leaf blades linear to linear-lanceolate; pseudopetiolate, or not pseudopetiolate. Ligule an unfringed membrane.

Inflorescence. Plants bisexual, with bisexual spikelets. Inflorescence paniculate (axes usually wavy, the spikelets appressed), or of spicate main branches (the primary branches often reduced to racemes); open; not comprising ‘partial inflorescences’ and foliar organs. Spikelet-bearing axes persistent. Spikelets not secund.

Female-fertile spikelets, florets, fruit. Spikelets 4–12 mm long; strongly compressed laterally; disarticulating above the glumes (i.e. above the pedicel cup representing them). Rachilla terminated by a female-fertile floret. Hairy callus absent. Glumes present to absent (represented only by a small 2-lobed cupule); if present, two; more or less equal; shorter than the adjacent lemmas; awnless. Upper glume 0 nerved. Spikelets with incomplete florets. The incomplete florets proximal to the female-fertile florets. The proximal incomplete florets 2 (small, vestigial, no more than half the spikelet length, sometimes only bristles); sterile. The proximal lemmas awnless. Female-fertile florets 1. Lemmas entire; pointed; awnless, or mucronate, or awned. Awns when present, 1; apical; non-geniculate; much shorter than the body of the lemma to much longer than the body of the lemma. Lemmas strongly carinate; 3–9 nerved. Palea present; relatively long (but narrower than the lemma). Lodicules present; membranous (but the membranous flange may be narrow); glabrous. Stamens 6. Ovary glabrous. Stigmas 2. Fruit small, or medium sized, or large. Hilum long-linear.

Photosynthetic pathway, leaf blade anatomy. C3; XyMS+. Mesophyll with arm cells; without fusoids. Midrib conspicuous; having complex vascularization. All the vascular bundles accompanied by sclerenchyma.

Taxonomy, distribution. Bambusoideae; Oryzodae; Oryzeae. 25 species. Holarctic, Paleotropical, and Neotropical.

Anatomical references. Metcalfe 1960; this project.


We advise against extracting comparative information from the descriptions. This is much more easily achieved using the DELTA data files or the interactive key, which allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa. See also Guidelines for using data taken from Web publications.


Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 1998 onwards. DELTA sample data: descriptions, illustrations, identification, and information retrieval. Version: 19th October 2016. delta-intkey.com’.

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