Grass Inflorescence Flower Arrangement In grasses Spikelet Arrangement

Grass Inflorescence = Flower Arrangement (In grasses, Spikelet Arrangement)

Grass Inflorescence Rachis: Stalk to which Spikelets or Branches containing Spikelets Attach Peduncle: Stalk of the Inflorescence Flag Leaf: Bract of the Entire Inflorescence

Grass Inflorescence: Rachis, Primary Branch

Grass Inflorescence Rachis Primary Branch Peduncle Secondary Branch

Simple Inflorescences Bouteloua simplex: Single Inflorescence Branch

Simple Inflorescences Danthonia unispicata: Single Spikelet

Spike • Spikelets Attached Directly to Rachis • Pedicels Lacking • Branches Lacking

Spike Elymus longifolius Elymus canadensis

Raceme • Spikelets Attached Directly to Rachis via Pedicel • Branches Lacking

Panicle • Inflorescence Branched • Spikelets Attached to Branch

Open Panicle

Open Panicle Agrostis gigantea Eragrostis curvula

Contracted / Closed Panicle Muhlenbergia rigens

Contracted / Closed Panicle Setaria viridis

Contracted / Closed Panicle Dactylis glomerata

Panicle (Primary Branches are Stalked Spikes) Bouteloua curtipendula

Panicle (Primary Branches are themselves Unstalked Spikes) Bouteloua hirsuta

Panicle (Primary Branches are themselves Stalked Spikes) Leptochloa dubia https: //plants. usda. gov/gallery/large/ledu_004_lhp. jpg

Panicle (Multiple Spicate Branches arising from Points on Rachis) “Digitate” Chloris virgata

Panicle (Branches with Pairs of Stalked, Unstalked Spikelets) Rame: Branch with Pairs of Stalked, Unstalked Spikelets

Panicle (Branches with Pairs of Stalked, Unstalked Spikelets) Bothriochloa ischaemum Rame: Branch with Pairs of Stalked, Unstalked Spikelets

Panicle of Rames (Branches with Pairs of Stalked, Unstalked Spikelets) http: //hasbrouck. asu. edu/imglib/seinet/Poaceae/Bothriochloa-barbinodis-F_2. jpg Bothriochloa barbinodis Rame: Branch with Pairs of Stalked, Unstalked Spikelets

Inflorescence Terminology • • Flag Leaf • Open Panicle Peduncle • Contracted Panicle Rachis Primary Branch • Panicle of Stalked Spikes Secondary Branch • Panicle of Unstalked Spikes Raceme • Digitate Panicle Spike • Panicle of Rames Panicle