The grass genera of the world
~ Phleum (P. gibbum Boiss.)
Habit, vegetative morphology. Annual. Culms 5–20 cm high; herbaceous; unbranched above. Culm nodes glabrous. The shoots not aromatic. Leaves not basally aggregated; non-auriculate; without auricular setae. Sheath margins free. Leaf blades narrow; 0.8–1.5 mm wide (0.8–5 cm long); not setaceous (usually convolute); usually rolled (convolute); not pseudopetiolate; without cross venation; persistent; rolled in bud. Ligule present; an unfringed membrane; not truncate (acute); 2.5–4 mm long.
Reproductive organization. Plants bisexual, all with bisexual spikelets; with hermaphrodite florets.
Inflorescence. Inflorescence determinate; without pseudospikelets; paniculate; contracted; more or less ovoid to spicate; without capillary branchlets; non-digitate; espatheate; not comprising partial inflorescences and foliar organs. Spikelet-bearing axes persistent. Spikelets not secund; shortly pedicellate, or subsessile.
Female-fertile spikelets. Spikelets 2.5–3 mm long (pale greenish); compressed laterally; disarticulating above the glumes. Rachilla terminated by a female-fertile floret (?). Hairy callus absent.
Glumes present; two; relatively large; very unequal (or at least, supposedly more so than in Phleum); shorter than the spikelets; shorter than the adjacent lemmas; joined (shortly, at base); hairless (rather leathery); pointed (acute); awnless; carinate; without a median keel-wing; similar (gibbous, narrow at base). Lower glume 3 nerved. Upper glume 3 nerved. Spikelets with female-fertile florets only.
Female-fertile florets 1. Lemmas similar in texture to the glumes (leathery); not becoming indurated; mucronate (terminally, the mucro to 0.6 mm long); hairy (dorsally covered with setules); carinate (in upper half), or non-carinate; without a germination flap; 5 nerved. Palea present; relatively long; apically notched; awnless, without apical setae; not indurated; 2-nerved; 2-keeled. Palea keels hairy (ciliate). Lodicules present; 2; free; membranous; glabrous; not toothed. Stamens 3. Anthers not penicillate; without an apically prolonged connective. Ovary apically glabrous; without a conspicuous apical appendage. Styles free to their bases. Stigmas 2.
Fruit, embryo and seedling. Fruit small (1.3 mm long). Hilum short (elliptical). Embryo small.
Classification. Watson & Dallwitz (1994): Pooideae; Poodae; Aveneae. Soreng et al. (2015): Pooideae; Poodae; Poeae; Poinae. 1 species (P. gibbum).
Distribution, phytogeography, ecology. Turkey.
Species of open habitats.
Special comments. Anatomical data wanting.
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, distributions of character states within any set of taxa, geographical distribution, and classifications. See also Guidelines for using data taken from Web publications.
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: 11th December 2017. delta-intkey.com/grass’.