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The grass genera of the world

L. Watson, T.D. Macfarlane, and M.J. Dallwitz

Suddia Renvoize

Habit, vegetative morphology. Perennial; rhizomatous. Culms 140–300 cm high; herbaceous; to 2.5 cm in diameter; unbranched above. Culm internodes solid (spongy). Leaves not basally aggregated (3–5 laminate leaves per culm, with several bladeless sheaths at the base); without auricular setae. Leaf blades lanceolate; broad; 35–105 mm wide (22–112 cm long); sagittate; flat; pseudopetiolate (the ‘petiole’ 16–100 cm long); pinnately veined; cross veined; with a conspicuous articulation at the base. Ligule present; an unfringed membrane; not truncate; 35–80 mm long.

Reproductive organization. Plants probably bisexual, all with bisexual spikelets (but known only from material with smutted, imperfect spikelets - i.e., as yet inadequately described); probably with hermaphrodite florets.

Inflorescence. Inflorescence paniculate; open (much branched, up to 35 cm long, the lower branches often in verticils); espatheate; not comprising ‘partial inflorescences’ and foliar organs. Spikelet-bearing axes persistent (apparently). Spikelets not secund; pedicellate.

Female-fertile spikelets. Spikelets 3.5–4.3 mm long; ovate. Rachilla terminated by a female-fertile floret (seemingly).

Glumes two; long relative to the adjacent lemmas; pointed; awnless; similar. Lower glume 5–7 nerved. Upper glume 7–9 nerved. Spikelets without proximal incomplete florets (seemingly).

Female-fertile florets 1 (seemingly). Lemmas entire; pointed; awnless; 3 nerved.

Abaxial leaf blade epidermis. Costal/intercostal zonation conspicuous. Papillae absent. Mid-intercostal long-cells rectangular; having markedly sinuous walls. Microhairs present; panicoid-type. Stomata common. Subsidiaries seemingly dome-shaped and triangular. Intercostal short-cells common; not paired (seemingly solitary). Costal short-cells conspicuously in long rows. Costal silica bodies ‘panicoid-type’; not sharp-pointed.

Transverse section of leaf blade, physiology. C3; XyMS+. Mesophyll with non-radiate chlorenchyma; without arm cells; with fusoids. The fusoids external to the PBS. Leaf blade adaxially flat. Midrib conspicuous (very much so, with large air spaces); having complex vascularization. Bulliforms present in discrete, regular adaxial groups. All the vascular bundles accompanied by sclerenchyma. Combined sclerenchyma girders present. Sclerenchyma all associated with vascular bundles.

Classification. Watson & Dallwitz (1994): Bambusoideae; Oryzodae; Phareae. Soreng et al. (2015): Oryzoideae; Phyllorachideae (?). 1 species (S. sagittifolia).

Distribution, phytogeography, ecology. Sudan.

Hydrophytic to helophytic.

References, etc. Morphological/taxonomic: Renvioze 1984.

Special comments. Morphological description very incomplete. Fruit data wanting.


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Cite this publication as: ‘Watson, L., Macfarlane, T.D., and Dallwitz, M.J. 1992 onwards. The grass genera of the world: descriptions, illustrations, identification, and information retrieval; including synonyms, morphology, anatomy, physiology, phytochemistry, cytology, classification, pathogens, world and local distribution, and references. Version: 13th November 2017. delta-intkey.com/grass’.

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