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42. AUiSTELLA Bert. Flores sessiles in panicula coarctata: perigonii 

 gluma calycina 2-valvis, valvis subacqualibu strictis, corollina brevior 2-val- 

 vis, valva externa cartilaginea aristata, aiista terminali recta articulata, valva 

 interna membranacea longior: squamae nectariferae 2 lineares: caryopsis li- 

 bera, glumis corollinis, arcte cinta. 



43. AGROSTIS L. Flores paniculati in anthesi patentes , antea et po- 

 slea contracti: perigonii gluma calycina 2-valvis persistens, corollina 2-valvis, 

 valvis inaequalibus, externa major inlra apicem aristata vel mutica, interna 

 minor, quandoque obsoleta: caryopsis libera. 



44. CRYPSIS Sclireb. Flores in racemo contractissimo: perigonii gluma 

 calycina 2-valvis, valvis inaequalibus muticis carinato-compressis , corollina 

 longior 2-vaIvis, valvis inaequalibus muticis: caryosis libera. 



46. LAPPACO Schreb. Flores subterni, laterales hermaphroditi, inter- 

 medii masculi vel neutri , in racemo laxifloro: perigonii gluma calycina 2- 

 valvis, valvis admodum inaequalibus, externa major ventricosa dorso echinata, 

 interna minima plana nuda, corollina 2-valvis nuda in valva calycina majore 

 abscondita, valvis inaequalibus, majore cartaceo-membranacea, minorem ex- 

 ternam hyalino-membranaceam, involventes: squamae nectariferae 2 minutae: 

 caryopsis libera minime sulcata. 



47. HORDEUM L. Flores terni, intermedius hermaphroditus , laterales 

 masculi.aut neutri, in spica distica continua articulata: perigonii gluma calycina 

 2-valvis, valvis angustissimis aristatis, corollina 2-valvis, valva externa mi- 

 nor acuminata aristata, in floribus lateralibus quandoque nuda , interna bi- 

 dentata: squamae nectariferae 2 variae: caryopsis, valvis corollinis, cinta. 



48- DIGITARLV Hall. Flores in spica filiformi digitata: perigonii gluma 

 calycina 3-valvis, valvis omnibus inacqualibus adpressis, externa minutissima, 

 corollina major 2-valvis cartilaginea, valvis inaequalibus , externa concava: 

 raryopsis, valvis calcynis, tunicata. 



49. CYNODON Rich. Flores in spica filiformi digitato-fasciculata: peri- 

 gonii mutici gluma calycina 2-valvis, valvis subaequalibus ovato-Ianceolatis, 

 coroirma longior cartilaginea 2-vaIvis , valva externa navicularis , internam 

 angustissimam canaliculatum includens: paleae nectariferae 2 minimae: ca- 

 ryopsis, valvis corollinis, tunicata. 



50. PHALARIS L. Flores in racemo spicaeformi composito, vel in pa- 

 nicula racemosa: perigonii gluma calycina 2-valvis , valvis aequalibus navi- 

 cularibus vel carinatis, corollina brevior inclusa 2-4-valvis, valvae 2 interio- 

 ves admodum majores: caryopsis valvis corollinis tunicata. 



