Family:
Poaceae Barnhart
Genus:
Oryza L.

Oryza ridleyi Hook.f.

This species is accepted, and its native range is Indo-China to New Guinea.

[GB]
Morphology General Habit
Perennial. Culms geniculately ascending, or decumbent; 100-150 cm long. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 3-5 mm long. Leaf-blades 15-30 cm long; 15-25 mm wide. Leaf-blade surface smooth. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; elliptic; 25-35 cm long; 10-15 cm wide. Primary panicle branches ascending; simple; 6-12 cm long. Panicle branches scaberulous. Spikelets appressed. Fertile spikelets pedicelled. Pedicels linear; angular; tip cupuliform.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 8.9 mm long; 2.5 mm wide; falling entire. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.6 mm long.
Fertile
Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 8.9 mm long; 2.5 mm wide; falling entire. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.6 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes both absent or obscure.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets similar; barren; without significant palea. Lemma of lower sterile floret subulate; 6-7.5 mm long; 0.8 length of spikelet; scaberulous. Lemma of upper sterile floret subulate; 6-7.5 mm long; 1 length of lower sterile floret. Fertile lemma elliptic; laterally compressed; 7-8 mm long; coriaceous; keeled; 5 -veined. Lemma midvein spinulose. Lemma surface scaberulous; rough on veins. Lemma margins interlocking with palea margins. Lemma apex awned; 1 -awned. Principal lemma awn 4-8 mm long overall. Palea elliptic; 9 mm long; coriaceous; 3 -veined; 1-keeled. Palea keels spinulose. Palea apex acuminate; with excurrent keel veins.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 6. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Disseminule comprising a floret.
Distribution
Asia-tropical: Indo-China, Malesia, and Papuasia.
Reference
Oryzeae. Fl Ceyl.

Native to:

Borneo, Cambodia, Laos, Malaya, Myanmar, New Guinea, Sumatera, Thailand, Vietnam

Oryza ridleyi Hook.f. appears in other Kew resources:

Date Reference Identified As Barcode Type Status Has image?
Dec 4, 1984 Ridley, H.N. [1178], Peninsular Malaysia K000290493 holotype Yes
Dec 4, 1984 Put [3103], Thailand K000631571 Yes
Dec 4, 1984 Kerr, A.F.G. [19780], Thailand K000631569 Yes
Dec 4, 1984 Smitinand, T. [10421], Thailand K000682190 Yes
Dec 4, 1984 Kerr, A.F.G. [19780], Thailand K000631568 Yes
Dec 4, 1984 Kerr, A.F.G. [4505], Thailand K000631567 Yes
Dec 4, 1984 Put [3103], Thailand K000631572 Yes
Dec 4, 1984 Put [3103], Thailand K000631570 Yes
Ridley [10007], Malaysia K000290606 Yes
Katayama, T.C. [W0001], Thailand K000682191 Yes

First published in Fl. Brit. India 7: 93 (1896)

Accepted by

  • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Gilliland, H.B. (1971). A revised flora of Malaya 3: 1-319. The Royal Botanic Gardens, Singapore.
  • Henty, E.E. (1969). A manual of the grasses of New Guinea: 1-215. Division of Botany, Dpt. of Forests, LAE, New Guinea.
  • Kress, W.J., DeFilipps, R.A., Farr, E. & Kyi, D.Y.Y. (2003). A Checklist of the Trees, Shrubs, Herbs and Climbers of Myanmar. Contributions from the United States National Herbarium 45: 1-590.
  • Turner, I.M. (1995 publ. 1997). A catalogue of the Vascular Plants of Malaya. Gardens' Bulletin Singapore 47(2): 347-655.

Literature

Kew Backbone Distributions

  • Camus, E.G. & Camus, A. in H. Lecomte (1922). Flore Générale de l'indo-Chine 1(3): 193-336.
  • Gilliland, H.B. (1971). A revised flora of Malaya 3: 1-319. The Royal Botanic Gardens, Singapore.
  • Henty, E.E. (1969). A manual of the grasses of New Guinea: 1-215. Division of Botany, Dpt. of Forests, LAE, New Guinea.
  • Hộ, P.-H. (2000). Câycỏ Việtnam. An Illustrated flora of Vietnam, ed. 2, 3: 1-1020. Pham-hoang Ho, Montréal.

  • GrassBase - The Online World Grass Flora

    http://creativecommons.org/licenses/by-nc-sa/3.0

  • Herbarium Catalogue Specimens

    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

  • Kew Backbone Distributions

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0