|
|
|
Hordeum Linn., Sp. Pl. 1:84. 1753. Gen. Pl. ed. 5, 37. 1754; Boiss., Fl. Or. 5:686. 1884; Hook.f., Fl. Brit. Ind. 7:371. 1896; Blatter & McCann, Bombay Grasses 280. 1935; Bor, Fl. Assam 5:75. 1940: Sultan & Stewart, Grasses W. Pak. 2:336. 1959; Bor, Grasses Burma Ceyl. Ind. Pak. 675. 1960; Bor in Towns., Guest & Al-Rawi, Fl. Iraq 9:244. 1968; Bor in Rech.f., Fl. Iran. 70:232. 1970; Tzvelev, Poaceae URSS 192, 1976; Bothmer in Bot. Tids¬skr. 74:117-146. 1979; Humphries in Tutin et al., Fl. Fur. 5:204. 1980.
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.
A genus of 25-30 species in temperate regions; 8 species occur in Pakistan, 3 of them cultivated (barley).
|
|
|
|
| 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 long-ciliate |
|
Hordeum murinum |
| + |
Glumes of central spikelet scabrid |
|
Hordeum marinum subsp. gussoneanum |
| |
|
|
|
| 7 (1) |
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 |
| + |
Anthers longer, more than 2.5 mm long; awn of central lemma usually much shorter than the body of the lemma |
|
Hordeum brevisubulatum |
|
|
|
List of lower taxa
| Related Links (opens in a new window) |
|
Treatments in Other Floras @ www.efloras.org
Other Databases
|
|
|
|
|
|
|
|
|
