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51. LAGURUS L. Floies in racemo spicaeformi densissimo: perigonii 

 gluma calycina membranacea, valvis aequalibus angustissimis dense sericeo- 

 plumosis, calycina 2-valvis brevis, valva externa apice 2-seta medio aristata, 

 interna 2-dentata minor: squamae nectariferae 2: caryopsis nuda- 



** Glumae calycinae 2-3-florae 



52. AIRA L. Flores in racemo spicaeformi vel panicula: perigonii gluma 

 calycina communis 2-valvis, valvis ut plurimum aequalibus carinatis muticis: 

 flores duohermaphroditi, uterque saepius pedicellatus, tertius, si adest, aborlivus: 

 gluma coroUina 2-vaIvis, valvis inaequalibus , villis brevissimis basi cinlis , 

 externa latior mutica vel dorso aristala: arista articuldta: caryopsis libera. 



53. MELIGA L. Flores in panicula laxa vel racemo : perigonii gluma 

 calycina communis cartaeea 2-vaIvis, valvis inaequafibus: flores 3-4, inferiores 

 1-2 perfecti, reliqui abortivi inter se invicem involuti, gluma corollina flo- 

 ris perfecti 2-vaIvis mulica , valvis inaequalibus , externa grandior concava 

 cartilaginea: squamae nectariferae 2: caryopsis libera valvis corollinis inclusa. 



54. DINEBRA Delil. Flores in spica laxa alterne ramosa: perigonii glu- 

 ma calycina communis 2-valvis, valvis lanceolatis subulatis apice subintor- 

 tis: flores alterni 3-5, imus sessilis, supremi interdum abortivi: glumae co- 

 rollinae 2-vaIvis, calycina, brevloris, valva externa apice eniarginato-mucro- 

 nulata, interna dentala: squamae nectariferae 2: caryopsis trigona libera , 

 valvis corollinis involuta. 



55. SACCARUM L. Flores geminati in racemo vel panicula: perigonii 

 gluma calycina communis 2-valvis, valvis sub aequalibus, lana longa sericea, 

 involucratis: flores irregulariter pedunculati, alter interdum abortivus: gluma 

 corollina 2-valvis mutica vel aristata, valvis inaequalibus , externa majore: 

 floris imperfecti 1-valvis gluma jamdudum mulica: stamina 2-3: caryopsis 

 ut plurimum libera. 



56. ANDROPOGON L Flores geminati polygamo-monoici in spica vel 

 panicula: perigonii, floris hermaphroditi sessilis aristati, gluma calycina car- 

 tacea 2-valvis, valvis subaequalibus, corollina 2-valvis , valvis inaequalihus, 

 externa major , internam breviorem angustissimam aristatam , amplectans: 

 floris masculi pedicellati mutiei, gluma calycina 2-vaIvis, valvis subaequali- 

 bus, glumam corollinam 1-2-valvem ciliatam, includens. 



57. POLLINIA Spreng. Flores 2-3-nati omnes ut plurimum peduncu- 

 lati, polygamo-monoici, in spica conjugata vel panicula: perigonii floris her- 



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