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 228 (IRLORIS MELVILLIANA.

��EXPLICATIO Tabula D.^

Plkuropogon Sabinit. 1. Varietatis o, planta magnitii- dine iiatiirali. 2. ejusd. locusta cum pedunculo et portione raclieos magis aucta. 3. periaiithiiim clansum articulo racheos insidens, auctiiis. 4. id. expaiisnm, pariter aiicturn. 5. valvula superior periantliii facie visa ad id. augment. 6. pollen. 7. flosculus periantliio orbatus exbibens stamina pistillum et lodicnlas auct. uti 4 et 5. 8. Var. (3, [)lanta mag. natnr. 9. ejusd. locusta cum pedunculo ad augm. id. ac. 2. 10. perianthium expansum genitalia et lodicularum alteram exhibens ad augm. n. 4.

��DUPONTIA.

Chae. Gen. Gluma subaequivalvis, scariosa, concava, mutica, locustam 2-3-floram subaequans. Perianihia mutica, scariosa, (basi barbata,) altero pedicellate ; valvulis integris, inferiore concava. Lodiculce 2. Ovarium m\hQYhQ. Stigmata subsessilia. Gary apsis

Gramen glahruin^ erediim. Folia linearia, plana, vaginis semifssisy basi integra. Panicula sinqjlex, coardata, fiisco et purpurascenti varia, pedicellis cum locustis continuis, jjerian- thiis separatim soluhillhus.

ccxci] (Jbs. Ad Deschampsiam pi'oxime accedit liocce genus; distinguitur periantliiis muticis, valvulis integris nee den- tatis. Cum Catabrosa, facie diversissima, convenit pluribus notis, differt glumis locustam subsequantibus, periantliiis basi breve barbatis. A Poa diversum locustis hand com- pressis, glumis perianthiisque concavis nee carinatis. Ad confirmandum genus caryopsis desideratur.

This genus is named in lionour of Monsieur Dupont, of Paris, author of a valuable essay on the Sheath of the leaves of Grasses, and of observations on the genus Atriplex.

1 See Note at p. 187.

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