— 501 — 



gluma caiyciim mcmbranacca, vnlvis ac(|iiali})us angiistissimis dense sericeo- 

 plumosis, calycina 2-valvis brcvis, valva externa ajtiee 2-scta medio aristata, 

 interna 2-denlala minor : sijuamac nectarifcrac duo : caryopsis nuda. 



** Glumac calycinac 2-3-florac 



52. AIRA L. Florcs in racenio siticiformi vel i)aiiicula: pcrigonii trluma 

 calycina communis 2-valvis, valvis ut jtlurimum aeciuaiiljus carinatis muticis: 

 Hores duo hermaphroditi, utcrquc sacpius pcdiccllatus, tertius si adcst abortivus: 

 jiluma rorollina 2-valvis , valvis inacipialibus villis brevissimis l)asi cintis , 

 externa latior mutica vel dorso aristata : arista articulata : caryopsis libera. 



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

 calycina communis cartacea 2-valvis, valvis inacqualibus: flores 3-4, inferiores 

 1-2 pcrfocti, rcliqui abortivi inter sc inviccm involuli : gluma corollina flo- 

 ris pcrfocti bivalvis mutica , valvis inaecpialibus , externa graridior concava 

 cartllaginea : squamae ncctariferae duo : caryopsis libera 'valvis coroUinis in- 

 clusa. 



5i. DIXKnil.V Dclih Florcs in spica laxa alterne ramosa : perigonii glu- 

 ma calycina communis 2-valvis, valvis lanceolalis subulatis apice subintortis: 

 llores alterni 3-5, imus sessilis, supremi interdum abortivi : glumac coroUi- 

 nae 2-valvis, calycina, brevioris, valva externa apice emarginato-mucronulata, 

 interna denfata : sijuamac ncctariferae duo : caryopsis trigona libera , valvis 

 forollinis involuta. 



55. S.\CCARUM L. Flores geminati in racemo vel panicula : perigonii 

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

 involucratis : llores irregidariter pedunculati , alter interdum abortivus : glu- 

 ma corollina 2-valvis mutica vel aristata, valvis inacciualibus, externa majore: 

 lloris imperfecti univalvis gluma jamdudum mutica : stamina 2-3 : caryopsis 

 ut plurimum libera. 



5(J. ANDKOPOGON L. Florcs geminati polygamo-monoici in spica vel pa- 

 nicula : perigonii , lloris bermapbroditi sessilis aristali , gluma calycina car- 

 tacea 2-valvis, valvis subae([ualibus : corollina 2-valvis , valvis inae([ualibus, 

 externa major, internam breviorem angustissimam aristatam, amploctans : floris 

 masculi pedicellati mutici, gluma calycina 2-valvis, valvis subeacjuaiibus, glu- 

 mam corollinam 1-2-valvem ciliatam, includens. 



57. POLLIXIA Sprang. Flores 2-3-nati omnes ut plurimum pedunculati, 

 |)olygamo-monoici in spica conjugata vel panicula : perigonii floris bermapbro- 



(■)5 



