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SUMMARY

CHARACTERISTICS OF ALL PRINCIPAL GROUPS

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Group 1

Single terminal spike, with spikelets having little or no stalk

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37 species in our area: Cynosurus, Hordeum, Hordelymus, Gaudinia, Psilurus, Nardus, Mibora, Brachypodium, Vulpia, Micropyrum, Lolium, (Schedondorus), Elytrigia, Aegilops (Triticum), Elymus

Group 2

2 or more spikes from main axis: with spikelets having little or no stalk

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8 species in our area: Echinochloa, Digitaria, Cynodon

Group 3

Compact panicle forming a single spike: cylindrical, oval or spherical

The pedicel (stalk under each spikelet) is not initially easy to see

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27 species in our area: Echinaria, Phalaris, (Cynosurus—see group 1), Tragus, Setaria, Sesleria, Rostraria, Koeleria, Dactylis, Anthoxsanthum, Polypogon, Gastridium, Phleum, Alopecurus,

Group 4a

Loose panicle, fertile spikelets mixed with sterile or male spikelets: Terminal axes articulated and fragile at maturity

No follow-on; single species in group

Sorghum halepense
Single species in our area: Sorghum halepense

Group 4

Loose panicle, one fertile (hermaphrodite) floret, other florets sterile or male i.e. 3+ glumelles (sometimes reduced to scales):

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10 species in our area: Arrhenatherum, Panicum, Melica, Holcus

Group 5

Loose panicle, one fertile (hermaphrodite) floret no other sterile i.e only 1-2 glumelles developed

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16 species in our area: Stipa, Calamagrostis, Agrostis, Piptatherum (incl. Oloptum), Achnatherum, Sporobolus, Milium

Group 6a

Loose panicle, 2+ fertile (hermaphrodite) florets, each surrounded by long white hairs, giving a silky panicle:

No follow-on; single species in group

Phragmites australis
Single species in our area: Phragmites australis

Group 6

Loose panicle, 2+ (fertile) hermaphrodite florets, hairy ligule: spikelets almost always without awns:

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11 species in our area Danthonia, Eragrostis, Molinia, Kengia

Group 7

Loose panicle, 2+ fertile (hermaphrodite) florets, membranous ligule, dorsal awn. Very long glumes

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16 species in our area Avena, Helictochloa (=Avenula), Avenula, Corynephorus, Aira, Deschampsia, Trisetum

Group 8

Loose panicle, 2+ fertile (hermaphrodite) florets, membranous ligule, awn terminal/sub-terminal/absent; very long glumes

No species in Group 8 in our area

Not a single species in our area

Group 9

Loose panicle, 2+ fertile (hermaphrodite) florets, membranous ligule, absent or terminal/sub-terminal awn; short glumes:

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51 species in our area Catapodium, Dactylis, Briza, Bromus (incl. Bromopsis, Ceratochloa et Anisthanta) , (Vulpia –see group I), Festuca (incl. Patzkia), ( Lolium voir groupe 1), Glyceria, Poa

Group 10

Grasses with unusual sexuality - no flowers, or male and female flowers on separate inflorescences or separate plants

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Poa bulbosa var. vivipara, Molinia caerulea (vivipare), Pyllostachys, (Bamboos),Cortaderia selloana (Pampas Grass), Zea mays (Maize)


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