Lolium perenne

Lolium perenne L., Sp. Pl. 83 1753. (syn: Hordeum compressum Boiss. & Orph. [Invalid]; Lolium aechicum Rouville [Spelling variant]; Lolium agreste Roem. & Schult. [Invalid]; Lolium brasilianum Nees; Lolium canadense Bernh. ex Rouville [Invalid]; Lolium canadense Michx. ex Brouss.; Lolium cechicum Opiz; Lolium compressum Boiss. & Orph. ex Nyman [Invalid]; Lolium cristatum Pers. ex B.D.Jacks. [Invalid]; Lolium felix Rouville [Illegitimate]; Lolium glumosum Planellas; Lolium gmelinii Honck.; Lolium halleri C.C.Gmel.; Lolium jechelianum Opiz; Lolium latum Roth ex Steud. [Invalid]; Lolium marschallii Steven; Lolium montevidense Rouville [Invalid]; Lolium multiflorum subsp. ramosum Guss. ex Arcang. .; Lolium perenne var. aristulatum Schur ………; Lolium pseudoitalicum Schur [Invalid]; Lolium repens Honck.; Lolium rigidum var. compressum (Boiss.) Boiss.; Lolium rosetlanum Fig. & Delile ex Rouville [Invalid]; Lolium strictum var. compressum Boiss.; Lolium tenue L.; Lolium trabutii Hochr.; Lolium vulgare Host;                              (=) Lolium boucheanum Kunth);

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Lolium perenne, common name Perennial Ryegrass or English Ryegrass, is a grass from the family Poaceae. It is native to Europe, Asia and northern Africa, but is widely cultivated and naturalised around the world.

The plant is a low-growing, tufted, hairless grass, and a bunch-type growth habit; tillering. The leaves are dark green, smooth and glossy on the lower surface, with untoothed parallel sides and prominent parallel veins on the upper surface. The leaves are folded lengthwise in bud (unlike the rolled leaves of Italian ryegrass, Lolium multiflorum) with a strong central keel, giving a flattened appearance. The ligule is very short and truncate, often difficult to see, and small white auricles grip the stem at the base of the leaf blade. Leaf sheaths at the base are usually tinged pink and hairless. Stems grow up to 90 cm. It has auricles.^[1]

The inflorescence is unbranched, with spikelets on alternating sides edgeways-on to the stem. Each spikelet has only a single glume, on the side away from the stem, and between 4 and 14 Florets without awns, unlike Italian ryegrass. The Anthers are pale yellow, and the plant flowers from May to November. Perennial ryegrass has a fibrous root system, with thick main roots and thinner lateral branches. Roots are usually arbuscular mycorrhizal.

(From Wikipedia on 20.4.13)
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Poaceae, Cyperaceae and Juncaceae Week: Poaceae- Lolium perenne L. from Kashmir-GS82 : Attachments(3). 1 post by 1 author.

Lolium perenne Linn., Sp. Pl. 1:83. 1753.

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References:

The Plant List  GRIN  Flora of Pakistan  Annonated checklist of Flowering plants of Nepal  Flora of China  Wikipedia  RBG Kew: GrassBase – Lolium perenne Description  Fact sheet