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Published In: Species Plantarum 1: 84. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: A genus of 25-30 species in temperate regions; 8 species occur in Pakistan, 3 of them cultivated (barley).


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Annuals or perennials. Leaf-blades usually flat. Inflorescence a linear to oblong spike. Spikelets 3 at each node, falling together at maturity, the triads arranged in 2 longitudinal rows with the fertile florets in 2, 4 or 6 longitudinal rows, each triad with a central bisexual spikelet and 2 lateral bisexual, male or sterile spikelets. Florets 1, rarely 2, the rhachilla usually prolonged; glumes linear-subulate to lanceolate and awned, free to the base; lemma lanceolate or ovate, 5-nerved; palea 2-keeled.

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1 Annuals (2)
+ Perennials (7)
2 (1) Rhachis tough, not breaking up at maturity (cultivated barleys) (3)
+ Rhachis fragile, readily breaking up at maturity (5)
3 (2) Lemma with an apical 3-lobed appendage Hordeum aegiceras
+ Lemma awned, without an apical 3-lobed appendage (4)
4 (3) Lateral spikelets fertile; spikes with 6 longitudinal rows of fertile spikelets Hordeum vulgare
+ Lateral spikelets barren; spikes with 2 longitudinal rows of fertile spikelets Hordeum distichon
5 (2) Awn of fertile lemma stout, 4-14 cm long Hordeum spontaneum
+ Awn of fertile lemma slender, not more than 3 cm long (6)
6 (5) Glumes of central spikelet scabrid Hordeum marinum subsp. gussoneanum
+ Glumes of central spikelet long-ciliate Hordeum murinum
7 (1) Anthers longer, more than 2.5 mm long; awn of central lemma usually much shorter than the body of the lemma Hordeum brevisubulatum
+ Anthers small, not more than 2.4 mm long, usually much less; awn of central lemma usually longer than the body of the lemma Hordeum bogdanii
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