Eremopyrum bonaepartis (Spreng.) Nevski

Two varieties of Eremopyrum bonaepartis are commonly recognised: var. bonaepartis has glabrous lemmas; var. sublanuginosum has hairy lemmas. Such varieties, however, are seldom of much significance in grasses. Another variant, var. pakistanicum, has shortly hairy lemmas but very long spikelets. Melderis transferred it to his Eremopyrum confusum at one point, but despite the length of the glumes (up to 20 mm) they are not convincingly awned.

1300-2200 m.

Culms geniculate and somewhat purple tinged near base, 5–30 cm tall, pubescent below spike. Leaf sheath not inflated on upper leaves, or slightly dilated on uppermost leaf, glabrous or rarely puberulent, scabrous; leaf blade green, 0.2–0.5 cm wide, scabrous. Spike green or faintly colored, ovoid lobed, 2–4.5 × 1.5–2.5(–2.8) cm. Spikelets divergent, pectinately arranged, closely pressed to each other, lax at maturity, 12–15 mm, with 3–5 florets, glabrous. Glumes linear, laterally strongly compressed, 9–14 mm, shorter than spikelet, apex gradually tapering to subulate tip. Lemma linear-lanceolate, 12–14 mm, glabrous, apex gradually tapering to awn 1.5–3 mm. Palea shorter and narrower than lemma, shortly thickly ciliate along keels, apex 2-dentate. Fl. and fr. Apr–May.

Tufted annual; culms up to 30 cm high, erect or geniculately ascending. Leaf-blades flat or folded, up to 10 cm long, 1-4 mm wide, scaberulous above, smooth beneath. Spike oblong, 1.5-4 cm long. Spikelets 3-5-flowered, the upper florets ± reduced; glumes lanceolate, acute or acuminate, 6-12 (-20) mm long, awnless; lemma 10-15(-22) mm long, linear-lanceolate, glabrous, scabrid or hairy, often produced at the tip into a short awn up to 3 mm long; palea-keels produced into 2 short blunt teeth with a shallow sinus between them.

Distribution: Pakistan (Baluchistan); Southwest and Central Asia.

Fl. & Fr. Per.: April-May.

A weed in desert and semi-desert zones. Xinjiang [Kazakhstan, Kyrgyzstan, Pakistan, Russia, Turkmenistan, Uzbekistan; E Mediterranean region].

Triticum bonaepartis Sprengel, Erster Nachtr. Bot. Gart. Halle, 40. 1801; Agropyron bonaepartis (Sprengel) T. Durand & Schinz; A. patulum Trinius, nom. illeg. superfl.; A. turkes-tanicum Gandoger; Eremopyrum bonaepartis var. turkestani-cum (Gandoger) Tzvelev; Triticum patulum Willdenow, nom. illeg. superfl.

Annuals, Terrestrial, not aquatic, Stems nodes swollen or brittle, Stems erect or ascending, Stems geniculate, decumbent, or lax, sometimes rooting at nodes, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly basal, below middle of stem, Leaves mostly cauline, Leaves conspicuously 2-ranked, dis tichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blade auriculate, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, Leaf blades scabrous, roughened, or wrinkled, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence terminal, Inflorescence simple spikes, Inflorescence a dense slender spike-like panicle or raceme, branches contracted, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence spike ovoid, lanceolate, or oblong, not more than twice as long as wide, Inflorescence single raceme, fascicle or spike, Inflorescence spikelets arranged in a terminal bilateral spike, Flowers bisexual, Spikelets sessile or subsessile, Spikelets laterally compressed, Spikelet less than 3 mm wide, Spikelets with 3-7 florets, Spi kelets solitary at rachis nodes, Spikelets distichously arranged, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating beneath or between the florets, Spikelets falling with parts of disarticulating rachis or pedicel, Inflorescence branches deciduous, falling intact, Spikelets in dense head-like clusters, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes equal to or longer than adjacent lemma, Glumes keeled or winged, Glumes 3 nerved, Glumes 4-7 nerved, Lemma similar in texture to glumes, Lemma coriaceous, firmer or thicker in texture than the glumes, Lemma 5-7 nerved, Lemma glabrous, Lemma body or surface hairy, Lemma apex acute or acuminate, Lemma awnless, Lemma mucronate, very shortly beaked or awned, less than 1-2 mm, Lemma awn less than 1 cm long, Lemma awned from tip, Lemma awns straight or curved to base, Lemma margins thin, lying flat, Lemma straight, Palea present, well d eveloped, Palea membranous, hyaline, Palea shorter than lemma, Palea 2 nerved or 2 keeled, Palea keels winged, scabrous, or ciliate, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear, Caryopsis hairy at apex.

Eremopyrum bonaepartis là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Spreng.) Nevski mô tả khoa học đầu tiên năm 1933.