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Key to Poaceae, Key C: bur, bead, or bulblet grasses of various tribes

Poaceae

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1 Fertile spikelets absent (spikelets modified into asexual, purplish bulblets) or variously spiny or bead like; [tribe Poeae]
 Poa
1 Fertile spikelets variously spiny or bead-like.
(c) Faccenda, Kevin - CC-BY
  2 Pistillate spikelets concealed within a hard, beadlike shell, this white, black, or variously colored; [tribe Andropogoneae]
  2 Spikelets concealed in a variously spiny bur, this green or tan, sometimes with pink or purple shading.
    3 Bur formed from accrescent branchlets, with fewer and less regularly arranged straight prickles (these typically retrorsely scabrous); [tribe Paniceae]
(c) Goldman, Douglas - CC-BY
    3 Bur formed from an enlarged glume, with 5-7 rows of hooked prickles; [tribe Cynodonteae; subtribe Traginae]